species_and_counties

CITATION	SYNONYM	ftFamName	COUNTY
Abies bifolia A. Murray	[Abies lasiocarpa (Hooker) Nuttall]	Pinaceae	AL, BL, CC, DT, GF, GA, HN, JA, LR, ME, MN, OR, PA, PE, RT, SJ, ST
Abies concolor (Gordon & Glendower) Lindley ex Hildebrand		Pinaceae	AL, AA, CN, CT, CU, EP, HF, LP, MZ, OR, RG, SJ, TL
Abronia argillosa Welsh & Goodrich		Nyctaginaceae	ME, MN, RB
Abronia carletonii Coulter & Fisher		Nyctaginaceae	BA, SW, YM
Abronia elliptica A. Nelson		Nyctaginaceae	DT, EA, GF, ME, MF, MZ, MN, RB, SM
Abronia fragrans Nuttall ex Hooker		Nyctaginaceae	AM, AH, BN, BL, CF, CH, CW, DV, EP, EL, HF, JF, KW, LR, LA, LN, LO, MR, OT, PA, PE, WL, YM
Abronia nana S. Watson		Nyctaginaceae	ME, MN
Abutilon incanum (Link) Sweet		Malvaceae	BA
Abutilon parvulum A. Gray		Malvaceae	FN
Abutilon theophrasti Medicus		Malvaceae	BL, ME
Acanthoxanthium spinosum (L.) Fourreau		Asteraceae	LA
Acer glabrum Torrey		Aceraceae	AL, AA, BL, CF, CC, CT, CU, DT, DV, EA, EP, GF, GL, GN, HF, JF, LP, LR, LA, ME, ML, MF, MZ, MN, OR, PA, PT, PE, RB, RT, SH, SM, SJ, ST, TL
Acer grandidentatum Nuttall ex Torrey & Gray		Aceraceae	MZ
Acetosella paucifolia (Nuttall) Loeve		Polygonaceae	GA, JA, MF, RT
Acetosella vulgaris (K. Koch) Fourreau		Polygonaceae	BL, CU, DG, EP, GL, GA, GN, HF, JF, LP, LR, MN, PT, RB, RT, SM, SJ, ST, TL
Achillea lanulosa Nuttall	[Achillea millefolium L. subsp. lanulosa (Nuttall) Piper]	Asteraceae	AL, AA, BL, CF, CH, CC, CN, CT, CU, DT, DL, DG, EA, EP, EL, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, PA, PT, RB, RG, RT, SH, SM, SJ, TL
Achillea millefolium L.		Asteraceae	BL
Achnatherum aridum (Jones) Barkworth	[Stipa arida Jones]	Poaceae	ME, MN
Achnatherum hymenoides	[Oryzopsis hymenoides (Roem. & Schul.) Ricker ex Piper, Stipa hymenoides Roem. & Schul.]	Poaceae	AL, AH, AA, BN, BL, CF, CH, CN, CW, DT, DL, EA, EP, EL, GF, GA, GN, HF, JA, JF, KC, LP, LR, LA, LN, LO, ME, ML, MF, MZ, MN, MR, PA, PE, RB, RG, RT, SH, SM, SW, ST, WL, YM
Achnatherum lettermanii (Vasey) Barkworth	[Stipa lettermanii Vasey]	Poaceae	BL, DT, DL, GF, GL, GA, JA, LR, ME, ML, MF, MN, PA, PT, RB, RT, SM, ST
Achnatherum nelsonii (Scribner) Barkworth	[Stipa nelsonii Scribner]	Poaceae	AA, BL, CF, CC, CN, CT, CU, DT, EA, GF, GL, GA, GN, JF, LP, LR, ME, ML, MF, MZ, MN, PA, PT, RB, RG, RT, SH, ST
Achnatherum pinetorum (Jones) Barkworth	[Stipa pinetorum Jones]	Poaceae	EP, GN, MN
Achnatherum richardsonii (Link) Barkworth	[Stipa richardsonii Link]	Poaceae	EA, GA, JA, LK
Achnatherum robustum (Vasey) Barkworth	[Stipa robusta (Vasey) Scribner]	Poaceae	AA, BL, CU, EP, GL, JF, LR, PA, SH, TL
Achnatherum scribneri (Vasey) Barkworth	[Stipa scribneri Vasey]	Poaceae	BL, CC, DG, EP, LR, LA, PA, SH
Achnatherum speciosum (Trinius & Ruprecht) Barkworth	[Stipa speciosa Trinius & Ruprecht]	Poaceae	ME, MZ
Achnatherum webberi (Thurber) Barkworth	[Stipa webberi (Thurber) Johnson, Oryzopsis webberi (Thurber) Bentham]	Poaceae
Achnatherum x bloomeri (Bolander) Barkworth	[Stipa bloomeri Bolander]	Poaceae	BL, ME, ML, RB
Acomastylis rossii (R. Brown) Greene subsp. turbinata (Rydberg) W. A. Weber	[Geum rossii (R. Brown) Seringe]	Rosaceae	AL, BL, CF, CC, DL, EA, EP, GF, GL, GN, JA, LP, LK, LR, ME, ML, MZ, OR, PA, PT, RT, SH, SM, SJ, ST
Aconitum columbianum Nuttall ex Torrey & Gray		Helleboraceae	BL, CF, CN, CT, CU, DL, EP, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, LA, ML, MZ, OR, PA, RB, RG, RT, SH, SJ, TL
Aconitum columbianum Nuttall ex Torrey & Gray var. bakeri (Greene) Harrington		Helleboraceae
Aconitum columbianum Nuttall ex Torrey & Gray var. columbianum		Helleboraceae
Acorus calamus L.		Acoraceae	BL, LR
Acosta diffusa (Lamarck) Sojak	[Centaurea diffusa Lamarck]	Asteraceae	BL, DG, EP, EL, GN, JF, LR, LN, MZ, WL
Acosta maculosa (L.) Holub	[Centaurea maculosa L.]	Asteraceae	BL, EP, JF, LP, MZ, MN
Acrolasia albicaulis (Douglas ex Hooker) Rydberg	[Mentzelia albicaulis Douglas ex Hooker]	Loasaceae	BL, CN, DT, FN, GF, GN, HF, JF, LR, LA, ME, MF, MZ, MN, MR, PE, RB, SM, WL
Acrolasia dispersa (S. Watson) Davidson	[Mentzelia dispersa S. Watson]	Loasaceae	BL, GF, GA, JF, LR, MN, RB, RT
Acrolasia gracilis Rydberg		Loasaceae	AA, GA, LP, LR, ME, MF, MZ, MN, RB
Acrolasia humilis Osterhout	[Mentzelia thompsonii Glad]	Loasaceae	DT, GF, ME, MF, MZ, MN, RB
Acroptilon repens (L.) De Candolle	[Centaurea repens L.]	Asteraceae	AL, BN, BL, CH, CN, GF, GN, JF, KW, ME, MF, MZ, MN, MR, RB, WL
Actaea rubra (Aiton) Willdenow subsp. arguta (Nuttall in Torrey & Gray) Hulten		Helleboraceae	AA, BL, CN, CU, DL, DG, EA, EP, GF, GL, GA, GN, HN, JF, LR, ME, ML, MZ, MN, PA, RB, RT, SH, SM, SJ, ST, TL
Adenolinum grandiflorum (Desvaux) W. A. Weber		Linaceae	BL
Adenolinum lewisii (Pursh) Loeve & Loeve	[Linum lewisii Pursh]	Linaceae	AL, AA, BA, BL, CN, CT, CU, DT, DL, DG, EP, GF, GL, GA, GN, HF, JA, JF, KW, LP, LK, LR, LA, LN, ME, ML, MF, MZ, MN, OT, PA, PT, PE, RB, RT, SH, SJ, SM, ST, TL
Adenolinum pratense (Norton) W. A. Weber		Linaceae	BA, BL, JF, OT, PE
Adiantum capillus-veneris L.		Pteridaceae	LA, MZ, MN
Adiantum pedatum L.		Pteridaceae	OR
Adoxa moschatellina L.		Adoxaceae	BL, CC, EP, GF, GL, GA, GN, HN, LP, LR, ME, ML, MZ, PA, SJ, SM, ST
Agalinis tenuifolia (M. Vahl) Rafinesque		Scrophulariaceae	AH, BL, DG, JF, WL, YM
Agaloma marginata (Pursh) Loeve & Loeve	[Euphorbia marginata Pursh]	Euphorbiaceae	BA, BN, BL, CH, DV, JF, KW, KC, LR, LA, LN, LO, OT, SW, WN, Ym
Agastache foeniculum Kuntze		Lamiaceae	DG, LA, PE
Agastache pallidiflora (Heller) Rydberg subsp. pallidiflora var. greenei (Briquet) R. Sanders		Lamiaceae	AA, CN, HN, LP, ML, OR, SJ
Agastache urticifolia (Bentham) Kuntze		Lamiaceae	DT, EA, GF, GN, ME, MN, PT, RB, RT
Ageratina herbacea (A. Gray) King & Robinson		Asteraceae	AA, EP, FN, LP, LA, ME, MZ, MN, OR
Agoseris aurantiaca (Hooker) Greene		Asteraceae	BL, CC, CN, DL, DG, EA, EP, FN, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, MF, MZ, MN, PA, PT, RB, RT, SH, SM, SJ, ST, TL
Agoseris glauca (Pursh) Rafinesque		Asteraceae	AA, BL, CF, CC, CN, CT, CU, DT, DL, DG, EA, EP, FN, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, ME, ML, MF, MZ, MN, PA, PT, PE, RB, RG, RT, SH, SJ, SM, ST, TL, WL
Agoseris glauca (Pursh) Rafinesque var. agrestis (Osterhout) Q. Jones ex Cronquist		Asteraceae
Agoseris glauca (Pursh) Rafinesque var. dasycephala (Torrey & Gray) Jepson		Asteraceae
Agoseris glauca (Pursh) Rafinesque var. glauca		Asteraceae
Agoseris glauca (Pursh) Rafinesque var. laciniata (D. C. Eaton) Smiley		Asteraceae
Agoseris heterophylla (Nuttall) Greene		Asteraceae	MF
Agrimonia striata Michaux		Rosaceae	AA, BA, BL, DG, EP, GN, HN, JF
Agropyron cristatum (L.) Gaertner (sensu lato)		Poaceae	BL, CH, DT, DL, DG, EP, GN, JA, JF, KW, KC, LP, LR, LA, ME, MF, MZ, MN, PT, RB, RT, TL
Agropyron cristatum (L.) Gaertner subsp. cristatum		Poaceae
Agropyron cristatum (L.) Gaertner subsp. desertorum (Fischer) Loeve		Poaceae
Agropyron cristatum (L.) Gaertner subsp. fragile (Roth) Loeve		Poaceae
Agropyron desertorum Fischer ex Link		Poaceae	CH, DT, DL, EP, GA, GN, JF, KW, KC, LP, LR, LA, LN, ME, MF, MZ, MN, RB, RT
Agropyron mongolicum Keng		Poaceae	BL, DG, JA, JF, LR, ME, MZ, MN, PT, TL
Agropyron pectiniforme Roemer & Schultes		Poaceae	BL, EP, GN, JF, LR, ME, MF, MZ, MN
Agrostemma gracilis Boissier		Caryophyllaceae	BL
Agrostis exarata Trinius		Poaceae	BL, DT, GF, GL, GA, GN, JA, JF, ME, MF, MZ, PT, RG, RT, SM
Agrostis gigantea Roth		Poaceae	AL, BL, CN, CT, CU, DT, DL, DG, EA, EP, EL, GF, GL, GA, GN, JA, JF, LP, LR, LA, LN, ME, ML, MF, MZ, MN, PT, RB, RG, RT, SH, SM, TL, WL, YM
Agrostis humilis Vasey		Poaceae	BL, CF, GL, GA, JA, LR, PT, RT, SJ
Agrostis idahoensis Nash		Poaceae	BL, GF, GA, GN, JA, LP, RT
Agrostis mertensii Trinius		Poaceae	BL, CC, GN, HN, LR, PA, PT, ST
Agrostis scabra Willdenow		Poaceae	AL, AA, BL, CF, CC, CU, DT, DL, DG, EA, EP, EL, GF, GL, GA, GN, HN, JA, JF, LK, LP, LR, ME, ML, MF, MZ, MN, PA, PT, RB, RT, SH, SM, SJ, ST, TL, WL
Agrostis stolonifera L.		Poaceae	BL, CC, JF, KC, MZ, RT, SM, YM
Agrostis thurberiana A. S. Hitchcock		Poaceae	EA, GL, GA, GN, LR, PT, RG
Agrostis variabilis Rydberg		Poaceae	BL, CC, GL, GA, LR, LP, PT, RB, RG, RT, SM
Ailanthus altissima (P. Miller) Swingle		Simaroubaceae	BA, BL, ME
Alcea rosea L.		Malvaceae	LN
Aletes acaulis (Torrey) Coulter & Rose		Apiaceae	BL, JF, LR
Aletes anisatus (A. Gray) Theobald & Tseng		Apiaceae	CF, CC, DG, EA, EP, GF, JF, MN, PA, RB, SH, TL
Aletes eastwoodiae (Coulter & Rose) W. A. Weber	[Lomatium eastwoodiae (Coulter & Rose) MacBride]	Apiaceae	ME, MN
Aletes humilis Coulter & Rose		Apiaceae	BL, LR
Aletes latilobus (Rydberg) W. A. Weber	[Lomatium latilobum (Rydberg) Mathias]	Apiaceae	ME
Aletes lithophilus (Mathias) W. A. Weber		Apiaceae	CF, CN, FN, HF, RG, SH
Aletes macdougalii Coulter & Rose subsp. breviradiatus Theobald & Tseng		Apiaceae	MZ
Aletes nuttallii (A. Gray) W. A. Weber		Apiaceae	GA, WL
Aletes petraeus (Jones) W. A. Weber		Apiaceae	MF
Aletes sessiliflorus Theobald & Tseng		Apiaceae	LP
Aletes tenuifolius (Nuttall ex Torrey & Gray) W. A. Weber	[Musineon tenuifolium Nuttall ex Torrey & Gray]	Apiaceae	LR, LO, WL
Alhagi maurorum Medikus		Fabaceae
Alisma gramineum Lejeune		Alismataceae	AL, BL, JF, MF, MZ, RT
Alisma triviale Pursh		Alismataceae	AA, AL, BL, CT, DL, DG, EA, EP, JF, LA, MN, PE, RT
Alliaria petiolata (Bieberstein) Cavara & Grande		Brassicaceae	EP
Allionia choisyi Standley		Nyctaginaceae
Allionia incarnata L.		Nyctaginaceae	LA, MZ, MN
Allium acuminatum Hooker		Alliaceae	AA, DT, DL, GF, GA, LP, ME, MF, MZ, MN, RB, RT, SM
Allium brandegei S. Watson		Alliaceae	EA, GN, MF, RB, RT
Allium brandegei S. Watson fma viviparum W. A. Weber		Alliaceae
Allium brevistylum S. Watson		Alliaceae	GA, JA, LR, RT
Allium cernuum Roth		Alliaceae	AL, AA, BL, CF, CC, CN, CT, CU, DG, EP, GF, GL, GN, JA, JF, LP, LK, LR, LA, ME, ML, MZ, PA, PT, RB, RG, RT, SH, TL
Allium geyeri S. Watson		Alliaceae	BL, CC, CT, CU, DL, EP, GL, GA, GN, HF, JF, LP, LR, LA, ME, MZ, MN, OR, PA, PE, SH, SM, SJ
Allium macropetalum Rydberg		Alliaceae	DT, ME, MZ, MN, SM
Allium nevadense S. Watson		Alliaceae	ME, MF
Allium rubrum Osterhout		Alliaceae	CN, DL, ML, MF, RG, RT, SJ, WL
Allium sativum L.		Alliaceae	BL
Allium schoenoprasum L. var. sibiricum (L.) C. J. Hartman		Alliaceae	JA
Allium textile Nelson & Macbride		Alliaceae	BA, BL, CH, CW, DV, DG, EP, EL, FN, GF, HF, JA, JF, KW, KC, LR, LA, LN, LO, ME, MF, MN, MR, PW, RB, SW, WN, WL
Almutaster pauciflorus (Nuttall) Loeve & Loeve	[Aster pauciflorus Nuttall]	Asteraceae	AL, DT, GN, LP, LK, ME, PA
Alnus incana (L.) Moench subsp. tenuifolia (Nuttall) Breitung		Betulaceae	AL, AA, BL, CF, CN, CU, DT, DL, DG, EP, GL, GA, GN, JA, JF, LP, LR, ME, ML, MZ, MN, PT, PE, RB, RG, RT, SH, SJ, ST, TL
Alnus incana (L.) Moench subsp. tenuifolia (Nuttall) Breitung fma incisa (W. A. Weber) W. A. Weber		Betulaceae
Alopecurus aequalis Sobolewski		Poaceae	AL, AA, BL, CF, CC, DT, DV, DL, DG, EA, EP, EL, GF, GL, GA, GN, HF, JA, JF, LP, ME, ML, MF, MN, PA, PE, RB, RT
Alopecurus alpinus L. subsp. glaucus (Lessing) Hulten		Poaceae	BL, CC, CN, GL, GA, LR, ML, PA, ST
Alopecurus arundinaceus Poir.		Poaceae	DV, LR, LN, ST, WL, YM
Alopecurus carolinianus Walter		Poaceae
Alopecurus geniculatus L.		Poaceae	JF, ME
Alopecurus pratensis L.		Poaceae	BL, EP, GA, GN, JF, LR, ME, PA, SJ, ST
Alsinanthe macrantha (Rydberg) W. A. Weber	[Arenaria macrantha (Rydb.) A. Nels. in Coult. & Nels.]	Alsinaceae	CC, DL, GF, GN, LP, PA, PT, SJ, ST
Alsinanthe stricta (Swartz) Reichenbach		Alsinaceae	BL, CC, GA, GN, HN, ST
Alsine media L.		Alsinaceae	BL, DV, JF
Alyssum alyssoides L.		Brassicaceae	BL, CU, GF, HF, JF, LR, ME, PT, RB, SM
Alyssum desertorum Stapf		Brassicaceae	AH, BL, DV, GN, JA, JF, LR, ME, MF, MZ, MN, PT, RB
Alyssum murale Waldstein & Kitaibel		Brassicaceae	BL
Alyssum parviflorum Bieberstein		Brassicaceae	AM, AH, BL, DT, DG, EL, HF, JF, LP, LR, LN, ME, ML, MZ, MN, SM, ST, WN
Amaranthus albus L.		Amaranthaceae	BA, BL, CH, DV, EL, FN, JF, KW, KC, ME, MZ, MN, OR, SH
Amaranthus arenicola I. M. Johnston		Amaranthaceae	AM, BA, BL, CH, CW, DV, EP, JF, KC, LA, LN, LO, MR, SW, WN, WL, YM
Amaranthus blitoides S. Watson		Amaranthaceae	AM, BA, BL, CH, DV, EL, GN, HF, JF, KW, KC, LR, LA, LO, ME, ML, MF, MZ, RT, SH, SW, TL
Amaranthus hybridus L.		Amaranthaceae	BL, ME
Amaranthus palmeri S. Watson		Amaranthaceae	BA, BL, CH, KW, KC, LA, PW, YM
Amaranthus powellii S. Watson		Amaranthaceae	MZ
Amaranthus pubescens (Uline & Bray) Rydberg		Amaranthaceae
Amaranthus retroflexus L.		Amaranthaceae	AL, BA, BN, BL, CH, DV, EL, GA, GN, HF, JF, KW, LA, ME, ML, MF, MZ, MN, OR, RB, SH, SW, TL
Amaranthus wrightii S. Watson		Amaranthaceae	EP, OT
Ambrosia acanthicarpa Hooker		Asteraceae	AL, BA, CH, CW, EP, FN, GN, KW, KC, LA, LN, ME, MF, MZ, MR, SH, SM, WN, WL, YM
Ambrosia artemisiifolia L. var. elatior (L.) Descourtils		Asteraceae	BL, EP, JF, KC, LR, LN, SW, WL
Ambrosia confertiflora De Candolle		Asteraceae	BA, LA
Ambrosia grayi (A. Nelson) Shinners		Asteraceae	BA, CH, KW, YM
Ambrosia linearis (Rydberg) Payne		Asteraceae	CH, CW, EP, KW, LN, PE
Ambrosia psilostachya De Candolle var. coronopifolia (Torrey & Gray) Farwell		Asteraceae	AH, BA, BL, CH, DG, EP, EL, JA, JF, KW, KC, LR, LA, LN, LO, ME, MR, SW, WL, YM
Ambrosia tomentosa Nuttall		Asteraceae	BL, CH, CC, DV, EP, GL, GA, GN, JF, LR, MF, MZ, WL
Ambrosia trifida L.		Asteraceae	AM, BA, BL, CC, CW, EP, EL, JF, KW, LA, LN, LO, SW
Amelanchier alnifolia Nuttall		Rosaceae	AL, AH, AA, BL, CF, CN, CU, DT, DL, EA, EP, FN, GF, GL, GA, GN, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, OR, PT, RB, RG, RT, SH, SM, SJ, ST, WL
Amelanchier utahensis Koehne		Rosaceae	AA, BL, CC, DL, EP, GF, GA, GN, JA, JF, ME, ML, MF, MZ, MN, OR, PT, RB, RG, SH, SM
Amerosedum lanceolatum (Torrey) Loeve & Loeve	[Sedum lanceolatum Torrey]	Crassulaceae	BL, CF, CC, CT, CU, DT, DG, EA, EP, GF, GL, GA, GN, HN, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, PA, PT, PE, RB, RT, SH, SM, SJ, ST, TL
Ammannia robusta Heer & Regel		Lythraceae	BL, DV, JF, ME, WL
Amorpha canescens Pursh		Fabaceae	BA, LA, SW
Amorpha fruticosa L.		Fabaceae	BL, DV, DG, JF, LA, MR, SW, WL
Amorpha nana Nuttall		Fabaceae	BA, BL, EP, JF, LA
Amphiscirpus nevadensis (S. Watson) Oteng-Yeboah		Cyperaceae	AL, PA, SH
Amsinckia lycopsoides Lehmann		Boraginaceae	CC
Amsinckia menziesii (Lehmann) Nelson & Macbride		Boraginaceae	BL, LR
Amsinckia retrorsa Suksdorf		Boraginaceae	BL
Amsonia jonesii Woodson		Apocynaceae	ME, MZ
Anagallis arvensis L. fma coerulea (Schreb.) Baumgartner		Primulaceae	BL
Anagallis minima (L.) Krause in Sturm		Primulaceae	BL
Anaphalis margaritacea (L.) Bentham & Hooker		Asteraceae	AA, BL, CF, CC, EA, EP, GA, GL, GN, JA, JF, LP, LR, LA, ML, OR, PT, RB, RT, SJ
Anchusa azurea P. Miller		Boraginaceae	BL, LR, PE
Anchusa officinalis L.		Boraginaceae	BL
Andropogon gerardii Vitman		Poaceae	AM, BA, BL, CH, EP, JF, LR, LA, LN, MZ
Andropogon hallii Hackel		Poaceae	AH, BA, BN, CH, CW, DV, EP, KW, KC, LA, LN, LO, PL, SW, WN, WL, YM
Androsace chamaejasme Host subsp. carinata (Torrey) Hulten		Primulaceae	AL, BL, CC, CU, EP, HF, LR, PA, PT, SH
Androsace filiformis Retzius		Primulaceae	GF, GL, GA, JA, PA, RB, RT
Androsace occidentalis Pursh		Primulaceae	BL, GN, JF, ME, MF, MZ, MN, RB, WL
Androsace septentrionalis L.		Primulaceae	AL, AA, BL, CF, CC, CN, CT, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SM, SJ, ST
Androstephium breviflorum S. Watson		Alliaceae	DT, ME, MF, MZ, MN
Anemonastrum narcissiflorum (L.) Holub subsp. zephyrum (A. Nelson) W. A. Weber	[Anemone narcissiflora L. subsp. zephyra (Nels.) Loeve et al.]	Ranunculaceae	BL, CF, CC, EA, GA, GN, LK, LR, PA, PT, RT, ST
Anemone cylindrica A. Gray		Ranunculaceae	AA, BL, CU, DG, EP, JF, LP, LR, LA, RB
Anemone multifida Poiret		Ranunculaceae	AL, AA, BL, CC, CT, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, JF, LP, LK, LR, ME, ML, OR, PA, PT, RB, RG, RT, SH, SJ, ST, TL
Anemone multifida Poiret subsp. saxicola (Boivin) W. A. Weber		Ranunculaceae
Anemone multifida Poiret var. globosa (Nuttall) Torrey & Gray		Ranunculaceae
Anemone parviflora Michaux		Ranunculaceae	CF, GN, ST
Anemone riparia Fernald		Ranunculaceae	HF
Anemonidium canadense (L.) Loeve & Loeve	[Anemone canadensis L.]	Ranunculaceae	AH, BL, CC, CT, DV, DG, EP, GL, GA, JF, LR, LA, PA, WL
Anemopsis californica Hooker		Saururaceae	AM, BL, OT, WL
Angelica ampla A. Nelson		Apiaceae	BL, GL, GN, JA, JF, LR, ME, PT, RB, SH, TL
Angelica grayi (Coulter & Rose) Coulter & Rose		Apiaceae	AL, BL, CF, CC, CU, GF, GL, GA, GN, JA, LP, LK, LR, ME, MZ, PA, PT, RT, SM, SJ, ST
Angelica pinnata S. Watson		Apiaceae	GA, JA, LR, ME, MF, RB, RT
Anisantha diandra (Roth) Tutin	[Bromus rigidus auctt., non Roth]	Poaceae	ME
Anisantha rubens (L.) Nevski	Bromus rubens L.	Poaceae	MZ
Anisantha sterilis (L.) Nevski	[Bromus sterilis L.]	Poaceae	BL, LR
Anisantha tectorum (L.) Nevski	[Bromus tectorum L.]	Poaceae	AH, AA, BA, BL, CH, CC, CW, CU, DT, DL, EP, GF, GN, JF, KW, KC, LP, LK, LR, LA, LN, LO, ME, ML, MF, MZ, MN, MR, PT, RB, RT, SM, SW, ST, TL, WL
Anoda cristata (L.) Schlechtendal		Malvaceae
Anotites menziesii (Hooker) Greene	[Silene menziesii Hooker]	Caryophyllaceae	AA, DT, EA, GL, GA, GN, HN, JA, JF, LP, ME, ML, MZ, MN, PA, PT, RB, RT, SM, ST
Antennaria corymbosa E. Nelson		Asteraceae	BL, DL, GF, GL, GA, GN, JA, LK, ME, ML, PA, PT, RB, RT, SJ
Antennaria dimorpha (Nuttall) Torrey & Gray		Asteraceae	AA, DT, GA, GN, LP, ME, MF, MZ, MN, OR, RB, SM
Antennaria howellii Greene subsp. neodioica (Greene) Bayer		Asteraceae	BL, DG, EP, JF, LR, RT
Antennaria luzuloides Torrey & Gray		Asteraceae	GA, JA, LR, RT
Antennaria marginata Greene		Asteraceae	AA, LP, ME, MZ, RG, SJ
Antennaria media Greene		Asteraceae	AL, BL, CF, CC, DL, EP, GF, GL, GA, GN, HF, JA, LP, LR, ME, PA, RT, SH, SJ, ST
Antennaria microphylla Rydberg		Asteraceae	AL, BL, CC, CT, CU, DL, EA, EP, GF, GL, GA, GN, JA, JF, LP, LK, LR, ML, MF, PA, SH, TL
Antennaria neglecta Greene		Asteraceae	BL, EP, PA
Antennaria parvifolia Nuttall		Asteraceae	AA, BL, CF, CN, CU, DT, DL, EA, EP, EL, GF, GL, GA, GN, HF, JA, JF, KC, LP, LR, LA, LN, ME, ML, MF, MZ, MN, PA, PT, PE, RG, RT, SH, SM, SJ, ST, TL, WL
Antennaria pulcherrima (Hooker) Greene subsp. anaphaloides (Rydberg) W. A. Weber	[Antennaria anaphaloides Rydberg]	Asteraceae	AL, BL, CT, EP, GF, GL, GN, HF, JF, LR, MF, MN, PA, PT, RB, ST, TL
Antennaria pulcherrima (Hooker) Greene subsp. pulcherrima		Asteraceae	PA
Antennaria rosea Greene		Asteraceae	AL, BL, CF, CC, CT, DT, DL, EA, EP, GF, GL, GA, GN, HF, JA, JF, LK, LR, LA, ME, ML, MF, MZ, MN, PA, PT, RB, RT, SH, SM, SJ, ST
Antennaria rosulata Rydberg		Asteraceae	AA, CF, CT, DL, HN, ML, MZ, RG, SH, SM
Antennaria umbrinella Rydberg		Asteraceae	AL, BL, CF, CC, DL, GF, GL, GA, GN, JA, LK, LP, LR, ME, PA, PT, SH, SJ, ST
Anthemis arvensis L.		Asteraceae	GN
Anthemis cotula L.		Asteraceae	BL, JF, ME, MN
Anthemis tinctoria L.		Asteraceae	PT
Anthoxanthum odoratum L.		Poaceae
Anticlea elegans (Pursh) Rydberg	[Zigadenus elegans Pursh]	Melanthiaceae	AL, BL, CF, CC, CN, CT, CU, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, LP, LK, LR, ME, ML, MZ, MN, OR, PA, SH, SM, SJ, ST, TL
Anticlea vaginata Rydberg		Melanthiaceae	MF
Anticlea virescens (Kunth) Rydberg		Melanthiaceae	EA, GF, GA, GN, PT, RT
Apera interrupta (L.) P. Beauvois		Poaceae	DG, JF, YM
Aphyllon fasciculatum (Nuttall) Torrey & Gray	[Orobanche fasciculata Nuttall]	Orobanchaceae	AH, AA, BL, CF, CC, CN, DG, EP, EL, GL, GA, GN, HF, JF, LR, LA, ME, ML, MF, MZ, MN, RB, RG, SH, SW, WL
Aphyllon uniflorum (L.) Torrey & Gray	[Orobanche uniflora L. var. sedi (Suksdorf) Achey]	Orobanchaceae	BL, CU, GF, GL, GA, GN, JF, ME, MF, MZ, MN, RB, RT
Apios americana Medicus		Fabaceae	BL, DV
Apocynum androsaemifolium L.		Apocynaceae	BL, CN, CT, DG, EP, GL, GA, GN, HF, JF, LP, LK, LR, LA, ME, MN, OR, PT, RB, RT, SH, TL
Apocynum cannabinum L.		Apocynaceae	AL, AA, BA, BL, CU, FN, GF, JF, KW, KC, LA, LR, LN, LO, ME, ML, MF, MZ, MN, MR, SM, SW, WL
Apocynum medium Greene		Apocynaceae	AH, AA, BL, DT, DG, EP, JF, MN
Apocynum sibiricum Jacquin		Apocynaceae	YM
Aquilegia barnebyi Munz		Helleboraceae	GF, GN, MN, PT, RB
Aquilegia chrysantha A. Gray var. rydbergii Munz		Helleboraceae	EP, FN
Aquilegia coerulea James ex Torrey		Helleboraceae	AL, BL, CF, CC, CN, CU, DT, DG, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, ME, ML, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SM, SJ, TL
Aquilegia elegantula Greene		Helleboraceae	AA, CN, CU, EA, EP, GF, GA, GN, HF, ME, ML, MZ, MN, OR, PT, RG, SJ, SM
Aquilegia micrantha Eastwood		Helleboraceae	DT, ME, MF, MN
Aquilegia pubescens Coville		Helleboraceae	BL
Aquilegia saximontana Rydberg ex B. L. Robinson in A. Gray		Helleboraceae	BL, CC, EP, GL, JF, LR, PA, ST
Arabis hirsuta (L.) Scopoli var. pycnocarpa (Hopkins) Rollins		Brassicaceae	AL, BL, CU, GL, GA, GN, JF, LK, LR, LA, ML, MF, MN, PA, RB, RT, SH
Aralia nudicaulis L.		Araliaceae	BL, DG, EP, GA, JF, LR
Aralia racemosa L.		Araliaceae	LP
Arceuthobium americanum Nuttall ex Engelmann		Viscaceae	BL, GL, GA, LR, MF, RT, ST
Arceuthobium cyanocarpum Coulter & Nelson		Viscaceae	BL, EP, MF
Arceuthobium divaricatum Engelmann		Viscaceae	GA, ME, MZ, MN
Arceuthobium douglasii Engelmann		Viscaceae	EP
Arceuthobium vaginatum (Willdenow) K. Presl subsp. cryptopodum (Engelmann) Hawksworth & Wiens		Viscaceae	AA, BL, CU, DL, DG, EP, JF, LA, ME, PE, TL
Arctium lappa L.		Asteraceae	OR, SM
Arctium minus (J. Hill) Bernhardi		Asteraceae	BL, DV, DG, EP, GN, JF, LA, MF, MZ, MN, OR, PT, WL
Arctium tomentosum P. Miller		Asteraceae	AH, DV
Arctostaphylos patula Greene fma platyphylla (A. Gray) P. V. Wells		Ericaceae	ME, MF, MN, RB, RT
Arctostaphylos uva-ursi (L.) Sprengel		Ericaceae	AL, BL, CF, CC, CN, CU, DG, EA, EP, GF, GL, GA, GN, LK, LR, ME, ML, MZ, PA, PT, RG, RT, SM, SJ, ST, TL
Arctostaphylos uva-ursi (L.) Sprengel subsp. adenotricha (Fernald & Macbride) Calder & Taylor	Arctostaphylos adenotricha (Fernald & Macbride) Loeve et al.	Ericaceae
Arctostaphylos uva-ursi (L.) Sprengel subsp. coactilis (Fernald & Macbride) Loeve et al.		Ericaceae
Arenaria serpyllifolia L.		Alsinaceae
Argemone hispida A. Gray		Papaveraceae	BL, DV, DG, EP, FN, JF, LR, LA, PE, WL
Argemone polyanthemos (Fedde) G. Ownbey		Papaveraceae	AH, BA, BL, CH, CC, CW, EP, EL, JF, KW, KC, LA, LR, LN, LO, MZ, MR, SW, WL, YM
Argemone squarrosa Greene		Papaveraceae	BA, BN, KW, PW
Argentina anserina (L.) Rydberg var. anserina	[Potentilla anserina L.]	Rosaceae	AL, AH, AA, CT, CU, DV, EA, GN, JA, LK, LR, ML, MF, PA, SH, TL
Argentina anserina (L.) Rydberg var. concolor Rydberg		Rosaceae
Argillochloa dasyclada (Hackel ex Beal) W. A. Weber	[Festuca dasyclada Hackel ex Beal]	Poaceae	GF, GN, ME
Argyrochosma fendleri (Kunze) Windham		Pteridaceae	AL, BA, BL, CF, CC, FN, GN, HN, LR, LA, ME, MN, PA, SH, TL
Argythamnia humilis (Engelmann & Gray) Muller-Argoviensis		Euphorbiaceae
Argythamnia mercurialina (Nuttall) Muller-Argoviensis		Euphorbiaceae	BA, LA
Aristida adscensionis L.		Poaceae	BA, BN, CH, EP, KW, KC, LA, LN
Aristida arizonica Vasey		Poaceae	JF, LA
Aristida basiramea Engelmann		Poaceae	BL, JF, LR
Aristida divaricata Humboldt & Bonpland ex Willdenow		Poaceae	BA, BN, CH, CW, EP, HF, KW, LA, LN
Aristida havardii Vasey		Poaceae	BA
Aristida purpurea Nuttall		Poaceae	AH, AA, BA, BN, BL, CH, CN, CW, DG, EP, EL, FN, GN, JF, KW, KC, LP, LA, LN, LO, ME, MF, MZ, MN, MR, OT, PL, PE, RG, SH, SW, WL, YM
Aristida purpurea Nuttall var. longiseta (Steudel) Vasey		Poaceae
Aristida purpurea Nuttall var. purpurea		Poaceae
Aristida wrightii Nash		Poaceae
Armeniaca vulgaris Lamarck		Rosaceae	DT, ME, MF
Armeria scabra Pallas subsp. sibirica (Turczaninov ex Boissier) Hylander		Limoniaceae	PA, ST
Armoracia rusticana Gaertner, Meyer, & Scherbius		Brassicaceae	CC, PE, TL
Arnica alpina (L.) Olin & Ladau subsp. tomentosa (Macoun) Maguire		Asteraceae	GN, PT
Arnica chamissonis Lessing subsp. foliosa (Nuttall) Maguire		Asteraceae	BL, CC, CN, DT, EA, GL, GA, GN, JA, LK, LR, ME, ML, MZ, MN, PA
Arnica cordifolia Hooker		Asteraceae	BL, CF, CC, CU, DT, DL, DG, EA, FN, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, OR, PA, PT, PE, RB, RG, RT, SH, SM, SJ, ST
Arnica fulgens Pursh		Asteraceae	BL, DG, EP, GL, JA, JF, LR, MF, PA
Arnica latifolia Bongard		Asteraceae	BL, CC, EP, GF, GL, GA, GN, JA, LR, OR, RT, SM, SJ, ST
Arnica longifolia D. C. Eaton		Asteraceae	GF, GN, JA
Arnica mollis Hooker		Asteraceae	BL, CC, CU, GF, GL, GA, GN, JA, LP, LK, LR, ME, ML, MF, MZ, OR, PA, PT, RT, SJ, ST
Arnica parryi A. Gray		Asteraceae	BL, CF, CC, GF, GL, GA, GN, JA, LK, ME, MZ, MN, PT, RB, RT, SM, SJ, ST
Arnica rydbergii Greene		Asteraceae	BL, CF, CC, GA, GN, JA, LK, LR, PA, PT, RT, ST
Arrhenatherum elatius (L.) P. Beauvois ex J. & K. Presl		Poaceae	BL, EP, LR, PT
Artemisia abrotanum L.		Asteraceae
Artemisia absinthium L.		Asteraceae	GN, OR, PT, WL
Artemisia annua L.		Asteraceae	BL
Artemisia arctica Lessing subsp. saxicola (Rydberg) Hulten		Asteraceae	BL, CC, GL, GA, JA, LR, PA, RB, RT, SJ, ST
Artemisia biennis Willdenow		Asteraceae	AL, BL, DG, EP, GF, GA, GN, JA, JF, ME, MF, MZ, PA, PT, RB, TL
Artemisia bigelovii A. Gray		Asteraceae	BN, CN, DT, EP, FN, LA, ME, MZ, MN, OT, PE, SH, SM
Artemisia carruthii Wood {ex} Carruth		Asteraceae	AA, BA, CT, CU, DT, DV, EP, HN, HF, LP, LA, LN, ME, ML, MZ, MN, RB, RG, SH, TL
Artemisia franserioides Greene		Asteraceae	AL, CN, CU, EP, ML, OR, RG, SH, SM, SJ
Artemisia frigida Willdenow		Asteraceae	AL, AA, BL, CC, CN, CT, CU, DG, EP, EL, GF, GL, GA, GN, HF, JA, JF, KC, LP, LK, LR, LA, LO, ME, ML, MF, MZ, MN, PA, PE, RB, RG, SH, SM, SJ, SW, ST, TL, YM
Artemisia laciniata Willdenow subsp. parryi (A. Gray) W. A. Weber		Asteraceae	CN, ML
Artemisia longifolia Nuttall		Asteraceae	AL, JA, ML
Artemisia ludoviciana Nuttall		Asteraceae	AL, AH, AA, BA, BL, CH, CC, CN, CT, DT, DV, DL, DG, EA, EP, EL, FN, GF, GL, GA, GN, HN, HF, JA, JF, KC, LR, LA, LN, LO, ME, ML, MF, MZ, MN, MR, PA, PT, PE, RB, RG, RT, SH, SM, SW, ST, TL, WN, WL, YM
Artemisia ludoviciana Nuttall subsp. albula (Wooton) Keck		Asteraceae	CN, ME, MZ, SM
Artemisia ludoviciana Nuttall subsp. incompta (Nuttall) Keck		Asteraceae	AH, AA, BA, BL, CC, CN, DG, EA, GF, GA, HN, JA, JF, LR, LA, ME, ML, MF, MZ, MN, PT, RB, SM, TL, WL
Artemisia ludoviciana Nuttall subsp. ludoviciana		Asteraceae	AL, BL, CH, CN, CT, DT, DV, DL, DG, EP, FN, GL, GA, GN, HF, JA, JF, KC, LR, LA, LN, ME, MF, MZ, MN, MR, PA, PE, RB, RG, RT, SM, SW, ST, TL, WN, WL, YM
Artemisia ludoviciana Nuttall subsp. mexicana (Willdenow) Keck		Asteraceae	GF, ME, MZ, MN
Artemisia michauxiana Besser in Hooker		Asteraceae	CN, CU, GF, HN, JA, ME, ML, PT, RT
Artemisia pattersonii A. Gray		Asteraceae	BL, CC, EP, GL, LR
Artemisia scopulorum A. Gray		Asteraceae	AL, AA, BL, CF, CC, CU, DL, EA, EP, GF, GL, GA, GN, HN, JA, LK, LP, LR, ML, MZ, PA, PT, RT, SH, SJ
Asclepias arenaria Torrey		Asclepiadaceae	CH, EP, KW, KC, LN, LO, PL, SW, WL, YM
Asclepias asperula (Decaisne) Woodson subsp. asperula		Asclepiadaceae	AA, BA, EP, FN, GF, LP, LA, ME, MF, MZ, MN, OT, PE, RB, SM
Asclepias cryptoceras S. Watson		Asclepiadaceae	DT, GF, ME, MF, MN, RB, SM
Asclepias engelmanniana Woodson		Asclepiadaceae	BA, BN, BL, CH, DV, FN, KC, LA, LN, OT, PE, SW, WL, YM
Asclepias hallii A. Gray		Asclepiadaceae	CF, EP, GF, GN, HN, JF, ML, RG, SH, TL
Asclepias incarnata L.		Asclepiadaceae	BN, BL, JF, KC, LR, LO, PE, SW, WL, YM
Asclepias involucrata Engelmann ex Torrey		Asclepiadaceae	BA, BN, LA
Asclepias latifolia (Torrey) Rafinesque		Asclepiadaceae	BA, CH, CW, HF, KW, KC, LA, LN, OT, PE
Asclepias macrosperma Eastwood		Asclepiadaceae	MZ
Asclepias macrotis Torrey		Asclepiadaceae	BA, LA
Asclepias oenotheroides Chamisso & Schlechtendal		Asclepiadaceae	LA
Asclepias pumila (A. Gray) Vail		Asclepiadaceae	AH, BA, BL, CH, DV, DG, FN, JF, KC, LR, LA, LN, SW, WL, YM
Asclepias rusbyi (A. Vail) Woodson		Asclepiadaceae	AA, ME
Asclepias speciosa Torrey		Asclepiadaceae	AL, AA, BN, BL, CH, CN, EP, EL, GL, GN, JF, KW, KC, LP, LR, LA, LN, LO, ME, MF, MZ, MN, PT, PW, RB, RT, SW, WL, YM
Asclepias stenophylla A. Gray		Asclepiadaceae	BL, DG, JF
Asclepias subverticillata (A. Gray) Vail		Asclepiadaceae	AA, BA, BN, BL, CH, CW, DT, FN, GN, KW, KC, LP, LA, LN, ME, MZ, MN, OT, PT, PW, SJ, YM
Asclepias tuberosa L. subsp. terminalis Woodson		Asclepiadaceae	AA, EP, LA, ME, MN, PE
Asclepias uncialis Greene		Asclepiadaceae	BA, DV, FN, HF, KC, LA, PW, PE
Asclepias viridiflora Rafinesque		Asclepiadaceae	BL, FN, JF, KW, KC, LR, LA, LN, LO, OT, PE, SW, WL, YM
Askellia nana (Richardson) W. A. Weber	[Crepis nana Richardson]	Asteraceae	BL, CF, CC, GN, LK, PA, PT, ST
Asparagus officinalis L.		Asparagaceae	AA, BL, CN, DV, EP, EL, JF, KC, LP, LR, ME, MF, MZ, MN, MR, RG, SW
Asperugo procumbens L.		Boraginaceae	BL, CC, JF, LR, MF
Asplenium adiantum-nigrum L.		Aspleniaceae	BL
Asplenium platyneuron (L.) Britton, Sterns, & Poggenberg		Aspleniaceae	BA, LA
Asplenium resiliens Kunze		Aspleniaceae	BA
Asplenium septentrionale (L.) Hoffmann		Aspleniaceae	AA, BL, CF, DG, EP, GN, HN, HF, JF, LR, LA, MF, PA, PE, SH, TL
Asplenium trichomanes L.		Aspleniaceae	BA, BL, CU, FN, GN, JF, LP, LR, LA, RT, TL
Asplenium trichomanes-ramosum L.		Aspleniaceae	EP, GF, GN, SJ
Aster alpinus L. var. vierhapperi (Onno) Cronquist		Asteraceae	CC, GL, ML
Aster bracteolatus Nuttall		Asteraceae	AA, GF, GN, ML, MZ, PT
Aster foliaceus Lindley ex De Candolle var. foliaceus		Asteraceae	AA, BL, CC, CF, CN, DT, EA, GF, GL, GA, GN, JA, LP, LK, LR, ME, ML, MF, PA, PT, RT, ST
Aster junciformis Rydberg		Asteraceae	AL, BL, GL, LR, PA
Aster laevis L. var. geyeri A. Gray		Asteraceae	AA, BL, CU, DT, DG, EP, GL, JF, LP, LR, LA, ME, MZ, MN, PE, SJ, TL, WL
Aster lanceolatus Willdenow subsp. hesperius (A. Gray) Semple & Chmielewski		Asteraceae	AL, BL, CC, CU, DG, EA, GN, JF, LP, LR, MZ, MN, PA, RG, TL, WL
Aster orthophyllus Greene		Asteraceae	PT
Aster porteri A. Gray		Asteraceae	BL, DG, EP, GL, JF, LR, LA, TL
Aster spathulatus Lindley ex De Candolle	[Aster occidentalis (Nuttall) Torrey & Gray]	Asteraceae	BL, CC, GL, GA, GN, JA, LR, ME, ML, PA, RG, SH, SM
Astragalus aboriginum Richardson		Fabaceae	BL, CF, EP, PA, PT
Astragalus aboriginum Richardson var. fastigiorum Jones		Fabaceae
Astragalus aboriginum Richardson var. glabriusculus (Hooker) Rydberg		Fabaceae
Astragalus adsurgens Pallas var. robustior Hooker		Fabaceae	AH, BL, CF, CN, CU, DG, EL, EP, GL, GA, HF, JA, JF, LR, LA, ML, MF, PA, RG, SH, SM, SW, ST, TL, WL
Astragalus agrestis Douglas ex G. Don		Fabaceae	AL, AA, BL, CN, CT, CU, DG, EP, GF, GA, GN, HF, JF, LR, ML, MF, PA, RG, SH, SM, TL, WL
Astragalus alpinus L.		Fabaceae	AL, BL, CF, CC, CN, CU, DT, DL, GL, GA, GN, HN, HF, JA, LP, LK, LA, ML, MZ, PA, PT, RB, RT, SH, SJ, ST, TL
Astragalus americanus (Hooker) Jones		Fabaceae
Astragalus amphioxys A. Gray var. vespertinus (Sheldon) Jones		Fabaceae	DT, DL, GF, ME, MF, MZ, MN, SM
Astragalus anisus Jones		Fabaceae	GN
Astragalus argophyllus Nuttall ex Torrey & Gray		Fabaceae	MF, MN
Astragalus argophyllus Nuttall ex Torrey & Gray var. martinii Jones		Fabaceae
Astragalus argophyllus Nuttall ex Torrey & Gray var. pephragmenoides Barneby		Fabaceae
Astragalus asclepiadoides Jones		Fabaceae	GF, ME, MN
Astragalus bisulcatus (Hooker) A. Gray		Fabaceae	AH, BA, BN, BL, CU, EP, EL, FN, GA, GN, HF, JF, KW, KC, LR, LA, LN, MF, MR, PE, SH, WL
Astragalus bodinii Sheldon		Fabaceae	AL, GA, JA, PA
Astragalus brandegei T. C. Porter in Porter & Coulter		Fabaceae	CN, GN, ML
Astragalus calycosus Torrey ex S. Watson		Fabaceae	LP, MN, MZ
Astragalus calycosus Torrey ex S. Watson var. calycosus		Fabaceae
Astragalus calycosus Torrey ex S. Watson var. scaposus Jones		Fabaceae
Astragalus canadensis L. var. canadensis		Fabaceae	BL, CC, JF, LR, RB
Astragalus ceramicus Sheldon		Fabaceae	AL, BA, CH, DV, EP, JF, KC, LA, LN, LO, MZ, PL, SH, WL, YM
Astragalus ceramicus Sheldon var. ceramicus		Fabaceae
Astragalus ceramicus Sheldon var. filifolius (A. Gray) F. J. Hermann		Fabaceae
Astragalus cerussatus Sheldon		Fabaceae	CN, FN, GN, RG, SH
Astragalus chamaeleuce A. Gray		Fabaceae	DT, EA, ME, MF, MN, RB
Astragalus cibarius Sheldon		Fabaceae	MF, RB
Astragalus cicer L.		Fabaceae	BL, CF, CC, FN, GN, JF, LR, MF, MZ, PT, RB
Astragalus coltonii Jones var. moabensis Jones		Fabaceae	DL, ME, MZ, MN
Astragalus convallarius Greene		Fabaceae	EA, GF, GA, GN, ME, MF, MN, RB, ST
Astragalus convallarius Greene var. convallarius		Fabaceae
Astragalus convallarius Greene var. scopulorum Barneby		Fabaceae
Astragalus crassicarpus Nuttall		Fabaceae	AH, BA, BN, BL, CU, DG, EP, FN, JA, JF, LR, LA, LN, PA, SH, TL, WL, YM
Astragalus crassicarpus Nuttall var. crassicarpus		Fabaceae
Astragalus crassicarpus Nuttall var. paysonii (L. Kelso) Barneby		Fabaceae
Astragalus cronquistii Barneby		Fabaceae	MZ
Astragalus debequaeus Welsh		Fabaceae	ME
Astragalus desperatus Jones		Fabaceae	ME
Astragalus deterior (Barneby) Barneby		Fabaceae	MZ
Astragalus detritalis Jones		Fabaceae	MF, RB
Astragalus drummondii Douglas ex Hooker		Fabaceae	AL, AH, BL, CF, CN, CT, CU, DG, EP, EL, GA, GN, HF, JF, LR, LA, LN, LO, ML, RG, SH, TL, WL
Astragalus duchesnensis Jones		Fabaceae	MF, RB
Astragalus eastwoodiae Jones		Fabaceae	ME, MN, SM
Astragalus eucosmus B. L. Robinson		Fabaceae	BL, CF, CC, GL, GA, JA, LR, PA
Astragalus falcatus Lamarck		Fabaceae	BL, LK, MZ
Astragalus flavus Nuttall		Fabaceae	AA, DT, GF, LP, ME, MF, MZ, MN, RB
Astragalus flexuosus (Hooker) G. Don		Fabaceae	AL, AA, BL, CN, CT, CU, DL, DG, EP, FN, GL, GA, HF, JF, LP, LR, LA, ME, MZ, MN, PE, RB, SH, SM
Astragalus flexuosus (Hooker) G. Don var. diehlii (Jones) Barneby		Fabaceae
Astragalus flexuosus (Hooker) G. Don var. flexuosus		Fabaceae
Astragalus geyeri A. Gray		Fabaceae	DT
Astragalus gracilis Nuttall		Fabaceae	BA, CH, DV, DG, EP, EL, KW, KC, LR, LA, LN, LO, OT, PE, WL, YM
Astragalus hallii A. Gray		Fabaceae	AL, CN, CT, GA, GN, JA, LP, LK, ML, PA, PE, RG, SH, ST, TL
Astragalus haydenianus A. Gray		Fabaceae	AA, DT, DL, GF, GA, JA, LP, ME, MF, MZ, MN, RB, RT, SM, ST
Astragalus humillimus A. Gray		Fabaceae	MZ
Astragalus iodopetalus (Greene ex Rydberg) Barneby		Fabaceae	AA
Astragalus jejunus S. Watson		Fabaceae	MF
Astragalus kentrophyta A. Gray		Fabaceae	CC, GA, JA, LR, ME, ML, MF, PA, RB, SH, WL
Astragalus kentrophyta A. Gray subsp. elatus (S. Watson) W. A. Weber		Fabaceae	ME, MF, RB
Astragalus kentrophyta A. Gray subsp. implexus (Canby ex Porter & Coulter) W. A. Weber		Fabaceae	CC, GA, JA, LR, ML, PA, SH
Astragalus kentrophyta A. Gray subsp. kentrophyta		Fabaceae	WL
Astragalus lentiginosus Douglas ex Hooker		Fabaceae	GA, ME, MZ, MN, SM
Astragalus lentiginosus Douglas ex Hooker var. diphysus (A. Gray) Jones		Fabaceae
Astragalus lentiginosus Douglas ex Hooker var. palans (Jones) Jones		Fabaceae
Astragalus lentiginosus Douglas ex Hooker var. platyphyllidius (Rydberg) M. Peck		Fabaceae
Astragalus leptaleus A. Gray		Fabaceae	GN, JA, PA, ST
Astragalus linifolius Osterhout		Fabaceae	DT, ME, MN
Astragalus lonchocarpus Torrey		Fabaceae	AA, BN, DL, EP, GF, HF, LA, ME, MF, MZ, MN, RB, SM
Astragalus lonchocarpus Torrey var. hamiltonii (C. L. Porter) Isely		Fabaceae
Astragalus lonchocarpus Torrey var. lonchocarpus		Fabaceae
Astragalus lotiflorus Hooker		Fabaceae	BA, BL, CH, EP, JF, KC, LA, LO, OT, WN, WL, YM
Astragalus lutosus Jones		Fabaceae	GF, ME, RB
Astragalus megacarpus (Nuttall) A. Gray		Fabaceae	GF, ME, MF, MN, RB
Astragalus microcymbus Barneby		Fabaceae	GN
Astragalus miser Douglas in Hooker var. oblongifolius (Rydberg) Cronquist		Fabaceae	BL, CN, CT, DT, EP, FN, GL, GA, GN, HF, JA, JF, ME, MF, MN, PA, RB, RT, SH, SM, ST, TL
Astragalus missouriensis Nuttall		Fabaceae	AA, BA, CH, DG, EP, EL, FN, GF, GN, HF, KW, KC, LP, LR, LA, LN, LO, MZ, MN, OT, PW, PE, SW, WL, YM
Astragalus missouriensis Nuttall var. amphibolus Barneby		Fabaceae
Astragalus missouriensis Nuttall var. humistratus Isely		Fabaceae
Astragalus missouriensis Nuttall var. missouriensis		Fabaceae
Astragalus mollissimus Torrey		Fabaceae	BA, BN, CH, DT, DL, EP, KC, LR, LA, LN, ME, MZ, MN, PA, PE, SM, SW, WL, YM
Astragalus mollissimus Torrey var. mollissimus		Fabaceae	BA, EP, KC, LR, LA, PE, SW, WL, YM
Astragalus mollissimus Torrey var. thompsoniae (S. Watson) Barneby		Fabaceae	DL, ME, MZ, MN, SM
Astragalus molybdenus Barneby		Fabaceae	GN, LK, ME, PA, PT, ST
Astragalus monumentalis Barneby var. cottamii (Welsh) Isely		Fabaceae	MZ
Astragalus musiniensis Jones		Fabaceae	GF, ME
Astragalus naturitensis Payson		Fabaceae	ME, MZ, MN, SM
Astragalus nelsonianus Barneby		Fabaceae
Astragalus newberryi A. Gray		Fabaceae	MZ
Astragalus nuttallianus De Candolle var. micranthemiformis Barneby		Fabaceae	BA, LA, ME, MZ, MN, OT
Astragalus oocalycis Jones		Fabaceae	AA, LP
Astragalus oophorus Jones var. caulescens (Jones) Jones		Fabaceae	DT, GF, GN, ME, MF, MZ, MN, OR, RB, SM
Astragalus osterhoutii Jones		Fabaceae	GA
Astragalus parryi A. Gray		Fabaceae	BL, CF, CC, CU, DG, EP, EL, GL, HF, JF, LR, PA, TL
Astragalus pattersonii A. Gray		Fabaceae	AA, EA, GF, GA, GN, LP, MZ, MN, RB, RT, SH, SM, ST
Astragalus pectinatus (Hooker) Douglas in Hooker		Fabaceae	BA, BN, CH, CW, EL, JA, KW, LR, LA, LN, MR, OT, PE, WL, YM
Astragalus piscator Barneby & Welsh		Fabaceae	ME
Astragalus plattensis Nuttall ex Torrey & Gray		Fabaceae	LO
Astragalus praelongus Sheldon		Fabaceae	AA, DT, DL, GF, ME, MZ, MN, SM
Astragalus praelongus Sheldon var. ellisiae (Rydberg) Barneby		Fabaceae
Astragalus praelongus Sheldon var. praelongus		Fabaceae
Astragalus proximus (Rydberg) Wooton & Standley		Fabaceae	AA, LP
Astragalus pubentissimus Torrey & Gray		Fabaceae
Astragalus puniceus Osterhout		Fabaceae	BA, LA
Astragalus purshii Douglas ex Hooker		Fabaceae	GA, JA, MF, RB
Astragalus racemosus Pursh		Fabaceae	BN, DT, EL, FN, KW, LR, LA, LN, OT, PE, PW, YM
Astragalus racemosus Pursh var. longisetus Jones		Fabaceae	FN, LR, PE
Astragalus racemosus Pursh var. racemosus		Fabaceae
Astragalus rafaelensis Jones		Fabaceae	MN
Astragalus ripleyi Barneby		Fabaceae	CN
Astragalus robbinsii (Oakes) A. Gray var. minor (Hooker) Barneby		Fabaceae	CC, GN, PA, PT
Astragalus schmolliae C. L. Porter		Fabaceae	MZ
Astragalus scopulorum T. C. Porter in Porter & Coulter		Fabaceae	AA, CF, CU, DL, EP, FN, GA, LP, LA, ME, MZ, MN, PA, RT, SH, SM, ST
Astragalus sesquiflorus S. Watson		Fabaceae	MN
Astragalus shortianus Nuttall in Torrey & Gray		Fabaceae	BL, DT, DG, EP, EL, GL, GA, JF, LR, LA, PA
Astragalus sparsiflorus A. Gray		Fabaceae	BL, EP, JF, PA, TL
Astragalus spatulatus Sheldon		Fabaceae	JA, JF, LR, LO, MF, RB, WL
Astragalus tenellus Pursh		Fabaceae	AA, BL, CF, EA, EP, EL, GF, GL, GA, GN, LA, ME, ML, MF, PA, RB, RT, SH, TL, WL
Astragalus tortipes J.L. Anderson & J.M. Porter		Fabaceae	MZ
Astragalus wetherillii Jones		Fabaceae	GF, ME, MF, MN, OR
Astragalus wingatanus S. Watson		Fabaceae	AA, DT, DL, HN, ME, MZ, MN, SM
Astragalus wootonii Sheldon var. wootonii		Fabaceae	CN, LP
Astrolepis integerrima (Hooker) Benham & Windham		Pteridaceae	LA
Athyrium distentifolium Tausch ex Opiz		Dryopteridaceae	BL, EA, GL, GA, GN, LR, RT
Athyrium filix-femina (L.) Roth ex Mertens		Dryopteridaceae	BL, DG, EA, EP, GA, JF, LR, MN, OR, PA, RT
Athyrium filix-femina (L.) Roth ex Mertens subsp. angustum (Willdenow) Hulten		Dryopteridaceae
Athyrium filix-femina (L.) Roth ex Mertens subsp. cyclosorum (Ruprecht) C. Christensen		Dryopteridaceae
Atragene columbiana Nuttall	[Clematis pseudoalpina (Kuntze) A. Nelson]	Ranunculaceae	AA, CN, CT, CU, DL, DG, EA, EP, GN, HF, JF, LP, LA, ME, ML, MZ, PA, PT, RB, RG, ST
Atragene occidentalis Hornemann	[Clematis columbiana auctt., non (Nutt.) T. & G.]	Ranunculaceae	BL, GA, LR, RT
Atriplex aptera		Chenopodiaceae	CN, DV, MZ
Atriplex argentea Nuttall		Chenopodiaceae	AL, AH, CN, DV, FN, KC, LP, LN, ME, MF, OT, PA
Atriplex canescens (Pursh) Nuttall		Chenopodiaceae	AL, AH, BL, CN, DT, DV, DL, EA, FN, GN, HF, JF, KW, LA, LN, LO, ME, MF, MZ, MN, MR, OT, PE, RB, RG, SH, WN, WL
Atriplex canescens (Pursh) Nuttall subsp. canescens		Chenopodiaceae
Atriplex canescens (Pursh) Nuttall subsp. garrettii (Rydberg) Hall & Clements		Chenopodiaceae
Atriplex confertifolia (Torrey & Fremont) S. Watson		Chenopodiaceae	DT, GF, ME, MF, MZ, MN, PE, RB, SM
Atriplex corrugata S. Watson		Chenopodiaceae	DT, ME, MF, MZ, MN
Atriplex gardneri (Moquin) Standley		Chenopodiaceae	DT, JA, ME, MF, MZ, MN, RB, WL
Atriplex graciliflora Jones		Chenopodiaceae	DT, ME
Atriplex grayi Collotzi ex W. A. Weber		Chenopodiaceae	DT, ME, MF, MZ
Atriplex heterosperma Bunge		Chenopodiaceae	BL, EA, JF, LR, LN, ME, MF, MZ, RB, WL
Atriplex hortensis L.		Chenopodiaceae	BL, CC, DV, GN, LP, MF, MZ, RB
Atriplex obovata Moquin		Chenopodiaceae	MZ
Atriplex pachypoda Stutz & Chu		Chenopodiaceae	LP
Atriplex patula L.		Chenopodiaceae	AH, BL, EA, FN, JF, LN, ME, MZ, PA, RG, WL
Atriplex powellii S. Watson		Chenopodiaceae	BL, DT, GF, HF, ME, MZ, MN, PE, RB
Atriplex rosea L.		Chenopodiaceae	AL, BL, DT, EA, GF, GN, JA, LR, LA, MF, ME, MZ, MN, RB, SM, WL
Atriplex saccaria S. Watson		Chenopodiaceae	ME, MZ, PE
Atriplex suckleyi (Torrey) Rydberg		Chenopodiaceae	RB
Atriplex truncata (Torrey) A. Gray		Chenopodiaceae	BL, DV, JA, ME, RB, RG
Atriplex wolfii S. Watson		Chenopodiaceae	AL, ME, MF, MN
Avena fatua L.		Poaceae	BL, JF, MZ, RT
Avena fatua L. var. sativa (L.) Haussknecht		Poaceae	BL, DV, LR, ME, TL
Avenua fatua L. var. fatua		Poaceae
Avenula hookeri (Scribner in Hackel) Holub		Poaceae	BL, CC, GL, GN, HF, PA
Axyris amaranthoides L.		Chenopodiaceae	DG, LK, PA, TL
Azaleastrum albiflorum (Hooker) Rydberg		Ericaceae	JA, LR, RT
Azolla mexicana K. Presl		Salviniaceae	LO, MR, SW
Baccharis salicina Torrey & Gray		Asteraceae	BN, DT, FN, ME, MN, PE
Baccharis wrightii A. Gray		Asteraceae	BA, BN, FN, KW, LA
Bacopa rotundifolia (Michaux) Wettstein in Engler & Prantl		Scrophulariaceae	BL
Bahia dissecta (A. Gray) Britton		Asteraceae	AA, BL, CC, CN, CT, CU, DG, EP, GL, HF, JF, LP, LR, ME, ML, MZ, MN, PA, RG, SH, SM, SJ, TL
Bahia neomexicana A. Gray	[Schkuhria multiflora Hooker & Arnott]	Asteraceae	AL, CF, CT, CU, EP, FN, LA
Balsamita major Desfontaines, non L.		Asteraceae	BL
Balsamorhiza hispidula W. M. Sharp		Asteraceae	MF, RB
Balsamorhiza sagittata (Pursh) Nuttall		Asteraceae	CN, DT, DL, EA, GF, GA, GN, JA, LP, ME, MF, MZ, MN, RB, SM, ST
Barbarea orthoceras Ledebour		Brassicaceae	BL, DT, GL, GA, GN, JA, JF, LR, MZ, PT, RB, RT, ST
Barbarea vulgaris R. Brown		Brassicaceae	BL, DG, GA, GN, JF, LP, LR, LA, ME, MN, RB, SM, ST
Bassia hyssopifolia (Pallas) Kuntze		Chenopodiaceae	AL, BL, EA, ME, MF, MZ
Bassia sieversiana (Pallas) W. A. Weber		Chenopodiaceae	AM, AL, AH, BA, BL, CH, DV, GN, JF, KW, KC, LR, LA, LN, ME, MF, MZ, MN, MR, PT, SH, SW, TL, WL, YM
Batrachium circinatum (Sibthorp) E. Fries subsp. subrigidum (Drew) Loeve & Loeve	[Ranunculus circinatus Sibthorp]	Ranunculaceae	AA, BA, BL, GF, GA, JA, JF, LR, PA, PT, RB, WL
Batrachium longirostre (Godron) F. Schultz	[Ranunculus longirostris Godron]	Ranunculaceae	GN
Batrachium trichophyllum (Chaix) van den Bosch	[Ranunculus trichophyllus Chaix]	Ranunculaceae	AL, BL, CC, CU, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LR, ME, ML, MZ, RB, RT, SM, TL
Beckmannia syzigachne (Steudel) Fernald subsp. baicalensis (Kuznetzow) Koyama & Kuwano		Poaceae	AL, AA, BL, CC, CU, DV, DL, DG, EP, GA, GN, JA, JF, LP, LR, ML, MZ, PA, RB, RT, SH, SJ, TL
Berberis fendleri A. Gray		Berberidaceae	AA, CN, LP, ME, ML, MN, RG, SM
Berberis vulgaris L.		Berberidaceae	BL, JF
Bergia texana (Hooker) Seubert ex Walpers		Elatinaceae	AM, BL, JF
Berlandiera lyrata Bentham		Asteraceae	BA, LA
Berteroa incana (L.) De Candolle		Brassicaceae	AH, BL, DG, EP, GA, JA, JF, LR
Berula erecta (Hudson) Coville		Apiaceae	AH, BA, BL, CU, JF, LR, LA, LN, MF, SM, WL, YM
Besseya alpina (A. Gray) Rydberg		Scrophulariaceae	BL, CF, CC, DL, EA, GL, GA, GN, LP, LK, LR, ME, OR, PA, PT, RB, SH, SJ, ST
Besseya plantaginea (Bentham in De Candolle) Rydberg		Scrophulariaceae	BL, CF, CT, CU, DG, EP, GF, HF, JF, LR, LA, PA, PE, RB, SM, TL
Besseya ritteriana (Eastwood) Rydberg		Scrophulariaceae	DL, GN, LP, MZ, MN, OR, SM, SJ
Besseya wyomingensis (A. Nelson) Rydberg		Scrophulariaceae	LR
Betula fontinalis Sargent	[Betula occidentalis Hooker]	Betulaceae	BL, CC, CT, CU, DT, EP, GF, HF, JF, LR, ME, MF, MZ, MN, PT, RT, SH, TL
Betula glandulosa Michaux		Betulaceae	BL, CF, CC, DT, EA, GL, GA, GN, JA, LK, LR, ME, OR, PA, PT, RT, SJ, ST
Betula papyrifera H. Marshall		Betulaceae	BL, EP
Bidens bigelovii A. Gray		Asteraceae	BA, LA
Bidens cernua L.		Asteraceae	AL, BA, BL, CN, DG, GN, JF, KC, LN, MZ, RG, SH, WL
Bidens comosa (A. Gray) Wiegand		Asteraceae	AM, AH, BL, CU, KC, LA, SW, WL, YM
Bidens frondosa L.		Asteraceae	AL, BA, BL, DV, EP, JF, KW, KC, LN, ME, MZ, SW, WL
Bidens frondosa L. var. frondosa		Asteraceae
Bidens frondosa L. var. puberula Wiegand		Asteraceae
Bidens tenuisecta A. Gray		Asteraceae	AL, AA, CC, CN, EP, HF, JF, ML, PA, RG, TL
Bistorta bistortoides (Pursh) Small	[Polygonum bistortoides Pursh]	Polygonaceae	AA, BL, CF, CC, CN, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, LA, ME, ML, MF, MZ, MN, OR, PA, PT, RG, RT, SH, SJ, ST, TL
Bistorta vivipara (L.) S. Gray	[Polygonum viviparum L.]	Polygonaceae	AL, AA, BL, CF, CC, CU, DL, EA, GF, GL, GA, GN, HN, LP, LK, LR, ME, ML, MZ, PA, PT, SH, SM, SJ, ST, TL
Blepharoneuron tricholepis (Torrey) Nash		Poaceae	AA, BL, CN, CU, DT, DL, DG, EP, GF, GL, GN, HF, JA, JF, LR, ME, ML, MZ, MN, PA, RB, RG, SH, SM, SJ, ST, TL
Boechera crandallii (B. L. Robinson) W. A. Weber	[Arabis crandallii B.L. Robinson]	Brassicaceae	CF, DT, GN, MN, PA
Boechera demissa (Greene) W.A. Weber		Brassicaceae	GN
Boechera divaricarpa (A. Nelson) Loeve & Loeve	[Arabis divaricarpa A. Nelson]	Brassicaceae	BL, CN, CU, EA, GL, GA, GN, LK, ML, MF, MZ, MN, PA, RG, SJ, ST
Boechera drummondii (A. Gray) Loeve & Loeve	[Arabis drummondii A. Gray]	Brassicaceae	AL, AA, BL, CF, CC, CN, DT, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, JA, LR, ME, ML, MF, MZ, MN, PA, PT, RB, RT, SH, SM, SJ, ST, TL
Boechera fendleri (S. Watson) W. A. Weber	[Arabis fendleri (S. Watson) Greene]	Brassicaceae	BL, CF, CU, DL, DG, GN, HN, JF, LR, LA, ME, ML, MF, MZ, MN, PA, RG, SH, SM, TL
Boechera fendleri (S. Watson) W. A. Weber subsp. fendleri	[Arabis fendleri (S. Watson) Greene]	Brassicaceae
Boechera fendleri (S. Watson) W. A. Weber subsp. spatifolia (Rydberg) W. A. Weber	[Arabis fendleri (S. Watson) Greene var. spatifolia (Rydb.) Rollins]	Brassicaceae
Boechera fernaldiana (Rollins) W. A. Weber	[Arabis fernaldiana Rollins]	Brassicaceae	MF
Boechera glareosa Dorn		Brassicaceae	MF
Boechera gunnisoniana (Rollins) W. A. Weber	[Arabis gunnisoniana Rollins]	Brassicaceae	GN, MN, SH
Boechera lemmonii (S. Watson) W. A. Weber	[Arabis lemmonii S. Watson]	Brassicaceae	CF, CC, EA, GN, HN, LK, PA, PT, SJ
Boechera lignifera (A. Nelson) W. A. Weber	[Arabis lignifera A. Nelson]	Brassicaceae	AL, CU, DT, EA, GN, JA, LK, ME, MF, MZ, MN, PA, RB, SH
Boechera oxylobula (Greene) W. A. Weber	[Arabis oxylobula Greene]	Brassicaceae	DT, GF, GN, HN, LK, MF, MN, PA, RB, SH
Boechera pallidifolia (Rollins) Weber	[Arabis pallidifolia Rollins]	Brassicaceae	GF, GN, MN
Boechera perennans (S. Watson) W. A. Weber	[Arabis perennans S. Watson]	Brassicaceae	AA, GF, ME, MZ, MN, PT, SM
Boechera pulchra (Jones ex S. Watson) W. A. Weber subsp. pallens (Jones) W. A. Weber	[Arabis pulchra Jones ex S. Watson var. pallens Jones]	Brassicaceae	DT, ME, MF, MZ, MN, RB
Boechera retrofracta (R. Graham) Loeve & Loeve	[Arabis holboelli Hornemann var. retrofracta (R. Graham) Rydberg]	Brassicaceae	BL, DT, EP, GL, GA, GN, JF, MF, MZ, MN, PA, RB, RT, ST
Boechera selbyi (Rydberg) W. A. Weber	[Arabis selbyi Rydberg]	Brassicaceae	DT, EA, GN, LK, LP, ME, MF, MZ, MN, RB
Bolboschoenus maritimus (L.) Palla subsp. fluviatilis (Torrey) Loeve & Loeve		Cyperaceae	MZ, YM
Bolboschoenus maritimus (L.) Palla subsp. paludosus (A. Nelson) Loeve & Loeve	[Scirpus paludosus A. Nelson]	Cyperaceae	AL, AH, BN, EA, GF, KW, LN, ME, MF, MZ, OT, PW, RB, SM, WL
Bolophyta alpina Nuttall	[Parthenium alpinum (Nuttall) A. Gray]	Asteraceae	WL
Bolophyta ligulata (Jones) W. A. Weber	[Parthenium ligulatum (Jones) Barneby]	Asteraceae	MF, RB
Bolophyta tetraneuris (Barneby) W. A. Weber	[Parthenium tetraneuris Barneby]	Asteraceae	CT, FN, PE
Bothriochloa barbinodis (Lagasca) Herter		Poaceae	ME
Bothriochloa bladhii (Retzius) S. T. Blake		Poaceae	EP, KC
Bothriochloa ischaemum (L.) Keng var. songarica (Ruprecht ex Fischer & Meyer) Celarier & Harlan		Poaceae	BA, BN, CH, DV, JF, KC, YM
Bothriochloa laguroides (De Candolle) Herter subsp. torreyana (Steudel) Allred & Gould		Poaceae	BA, BN, BL, CH, FN, JF, KW, KC, LA, PE, YM
Bothriochloa springfieldii Gould		Poaceae	BA, LA
Botrychium "colorado" W. Wagner		Ophioglossaceae	SJ
Botrychium campestre Wagner & Farrar		Ophioglossaceae
Botrychium echo W. H. Wagner		Ophioglossaceae	BL, CC, DT, EP, GN, LR, PA, SJ, ST
Botrychium hesperium (Maxon & Clausen) Wagner & Lellinger		Ophioglossaceae	BL, CC, JA, LR, ST
Botrychium lanceolatum (S. G. Gmelin) Angstrom		Ophioglossaceae	BL, CC, EA, GA, GN, HN, LK, LR, SJ, ST
Botrychium lineare W. H. Wagner, {ined}.		Ophioglossaceae	EP, GA, LK
Botrychium lunaria (L.) Swartz subsp. occidentalis Loeve et al.		Ophioglossaceae	BL, CC, CN, GA, GN, LK, LR, PA, SJ, ST
Botrychium minganense		Ophioglossaceae	BL, CF, CC, EA, GL, GN, HN, LK, LR, PA, SJ, ST
Botrychium multifidum (S. G. Gmelin) Ruprecht subsp. coulteri (Underwood) Clausen		Ophioglossaceae	LR, RT
Botrychium pallidum W. H. Wagner		Ophioglossaceae	BL, CC, GN, PA, SJ, ST
Botrychium pinnatum St. John		Ophioglossaceae	ML, SJ
Botrychium simplex A. S. Hitchcock		Ophioglossaceae	BL, CN, GL, GA, HN, SH, ST
Botrypus virginianus (L.) Holub subsp. europaeus (Angstrom) Holub		Ophioglossaceae	BL
Bouteloua curtipendula (Michaux) Torrey		Poaceae	AA, BA, BN, BL, CH, CW, DT, DV, DG, EP, EL, FN, JF, KW, KC, LP, LR, LA, LN, LO, ME, MZ, MN, SW, YM
Bouteloua curtipendula (Michaux) Torrey var. caespitosa Gould & Kapadia		Poaceae
Bouteloua curtipendula (Michaux) Torrey var. curtipendula		Poaceae
Brachyactis ciliata Ledebour subsp. angusta (Lindley) A. Jones	[Aster brachyactis S.F. Blake]	Asteraceae	BL, EA, EL, JA, JF, KC, MF, RB, WL
Brachyactis frondosa (Nuttall) A. Gray	[Aster frondosus (Nuttall) Torrey & Gray]	Asteraceae	AL, JA, MF
Brachypodium distachyon (L.) P. Beauvois		Poaceae	AH
Brassica elongata Ehrhart var. integrifolia (Boissier) Breistroffer		Brassicaceae
Brassica juncea (L.) Cosson		Brassicaceae	CN, BL
Brassica napus L.		Brassicaceae	AL, BL, CC, GN, WL
Brassica nigra (L.) K. Koch		Brassicaceae	BL
Brassica rapa L.		Brassicaceae
Braya glabella (Richardson) S. Watson var. glabella		Brassicaceae	CF, GN, PT
Braya humilis (C. A. Meyer) B. L. Robinson		Brassicaceae	CF, GN, PA, ST
Breea arvensis (L.) Lessing	[Cirsium arvense (L.) Scopoli]	Asteraceae	BL, DT, DV, EA, EP, EL, GA, GN, JA, KW, KC, LP, LN, ME, MF, MZ, MN, MR, PT, RB, RG, RT, TL, WL, YM
Breea incana (S. G. Gmelin) W. A. Weber, ined.	[Cirsium incanum (S.G. Gmelin) Fischer ex Bieberstein]	Asteraceae	BL, EP, GN, JF, LR, MZ, MN, TL
Brickellia brachyphylla A. Gray		Asteraceae	AA, BA, LA, MZ
Brickellia californica (Torrey & Gray) A. Gray		Asteraceae	AA, BA, BL, DT, FN, GF, JF, LA, LR, ME, MZ, MN, SM
Brickellia eupatorioides (L.) Shinners		Asteraceae	BL, CH, JF, KC, LR, LA, LN, LO, PW, SW, WL, YM
Brickellia grandiflora (Hooker) Nuttall		Asteraceae	AL, BA, BL, CF, CC, CU, EA, EP, GF, GN, JA, JF, LP, LR, LA, LO, ME, ML, MF, MZ, MN, OR, PA, PT, RB, RT, SH, SM, SJ, TL
Brickellia longifolia S. Watson		Asteraceae	DT, ME, MN
Brickellia microphylla (Nuttall) A. Gray subsp. scabra (A. Gray) W. A. Weber		Asteraceae	DT, GF, LP, ME, MF, MZ, MN, RB
Brickellia oblongifolia Nuttall		Asteraceae	AA, DT, ME, MZ, MN, RB, SM
Brickellia rosmarinifolia (Ventenat) W. A. Weber subsp. chlorolepis (Wooton & Standley) W. A. Weber		Asteraceae	AA, BA, BL, CN, CU, DV, GF, JF, LP, LA, LR, MZ, MN, OR, PE, RG, SH, SM
Briza maxima L.		Poaceae
Briza media L.		Poaceae	BL
Bromelica bulbosa (Geyer ex Porter & Coulter) W. A. Weber	[Melica bulbosa Geyer ex Porter & Coulter]	Poaceae	GF, GA, MF, RT, ST
Bromelica spectabilis (Scribner) W. A. Weber	[Melica spectabilis Scribner]	Poaceae	BL, DT, DL, EA, GF, GL, GA, GN, JA, ME, MN, RB, RT
Bromelica subulata (Grisebach) Farwell	[Melica subulata Grisebach]	Poaceae	GN
Bromopsis canadensis (Michaux) Holub	[Bromus ciliatus L.]	Poaceae	BL, CC, CT, CU, DL, EA, EP, GF, GL, GA, GN, HN, JA, JF, LR, LA, ME, ML, MF, MN, PA, PT, RB, RT, SH, SJ, SM, ST
Bromopsis canadensis (Michaux) Holub subsp. canadensis	[Bromus ciliatus L.]	Poaceae
Bromopsis canadensis (Michaux) Holub subsp. richardsonii (Link) Tsvelev	[Bromus richardsonii Link]	Poaceae
Bromopsis inermis (Leysser) Holub	[Bromus inermis Leysser]	Poaceae	BA, BL, CH, CN, CU, DG, DL, EA, EP, GF, GA, GN, JA, JF, KC, LP, LR, LN, ME, MF, MZ, MN, PA, PT, RB, RG, SH, SM, ST, TL, WL
Bromopsis lanatipes (Shear) Holub	[Bromus anomalus Ruprecht ex Fournier var. lanatipes (Shear) A.S. Hitchcock]	Poaceae	AA, BL, CF, CU, DT, DL, DG, EP, GA, GN, JA, JF, LP, LA, MZ, MN, PT, RB, RT, SH, SM, ST
Bromopsis porteri (Coulter) Holub	[Bromus anomalus auctt., non Ruprecht ex Fournier, Bromus porteri (Coulter) Nash]	Poaceae	AL, AA, BL, CF, CN, CU, DT, EA, EP, GF, GL, GA, GN, HN, JF, LR, LA, ME, ML, MF, MZ, MN, PA, RB, SJ, TL
Bromopsis pubescens (Mühlenberg ex Willdenow) Holub	[Bromus pubescens Muhlenberg ex Willdenow]	Poaceae	BL
Bromopsis pumpelliana (Scribner) Holub	[Bromus pumpellianus Scribner]	Poaceae	BL, CU, EP, GF, GL, GA, GN, HF, ME, PA, RT, TL
Bromus briziformis Fischer & Meyer		Poaceae	BL, JF
Bromus commutatus Schrader		Poaceae	MN, PT
Bromus hordeaceus L.		Poaceae	MF
Bromus japonicus Thunberg		Poaceae	AA, BA, BL, CH, DG, EL, GF, JF, KW, KC, LP, LR, LA, LN, LO, ME, MZ, OT, PW, RB, RT, SW, WL, YM
Bromus racemosus L.		Poaceae	MF
Bromus secalinus L.		Poaceae	CU, EP, MZ
Bromus squarrosus L.		Poaceae	BL, EL, MF, RB
Buchloe dactyloides (Nuttall) Engelmann		Poaceae	BA, BN, BL, CH, EP, EL, JF, KW, KC, LR, LA, LN, LO, MR, PW, SW, WL, YM
Buglossoides arvense (L.) I. M. Johnston		Boraginaceae	BL
Bupleurum triradiatum Adams subsp. arcticum (Regel) Hulten		Apiaceae	LP
Caesalpinia jamesii (Torrey & Gray) Fisher		Fabaceae	BA, BN, CH, CW, EP, KC, LA, OT, PW, PE, WL, YM
Calamagrostis canadensis (Michaux) P. Beauvois		Poaceae	AL, BL, CF, CC, CN, CU, DT, DL, EA, EP, GF, GL, GA, GN, JA, JF, LP, LK, LR, ML, MZ, PA, PT, RB, RG, RT, SH, SM, SJ, ST, TL
Calamagrostis montanensis (Scribner) Scribner in Vasey		Poaceae
Calamagrostis purpurascens R. Brown in Richardson		Poaceae	AL, BL, CF, CC, CU, DT, EP, GF, GL, GA, GN, HN, LK, LR, ME, PA, PT, SJ, ST, TL
Calamagrostis rubescens Buckley		Poaceae	MF, RT
Calamagrostis scopulorum Jones		Poaceae	AA, DT, GN, ME, MN, RB, SM
Calamagrostis stricta (Timm) Koeler		Poaceae	BL, CC, CT, FN, GL, GN, JA, JF, LR, ML, MF, PA, RT, SH, SM, TL
Calamovilfa gigantea (Nuttall) Scribner & Merrill		Poaceae	BA, BN, CH
Calamovilfa longifolia (Hooker) Scribner in Hackel		Poaceae	AM, AH, BL, CH, DV, DG, EP, KW, KC, LA, LN, LO, PL, SW, WN, WL, YM
Calibrachoa parviflora (Juss.) D'Arcy		Solanaceae	BN, KW
Callirhoe involucrata (Torrey & Gray) A. Gray		Malvaceae	BL, CH, EP, KW, KC, LA, PW, YM
Callitriche hermaphroditica L.		Callitrichaceae	EP, GN, TL
Callitriche heterophylla Pursh emend. Darby		Callitrichaceae	BL, MN, TL
Callitriche verna L. emend. Lonnroth		Callitrichaceae	BL, CF, CN, CU, DT, DG, EP, GF, GL, GA, GN, JA, JF, LR, ME, MF, MZ, PA, RG, RT, ST, TL
Calochortus flexuosus S. Watson		Calochortaceae	MZ, MN
Calochortus gunnisonii S. Watson		Calochortaceae	AA, BL, CC, CN, CU, DT, DL, DG, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, LA, ME, MF, MZ, MN, PA, PT, PE, RB, RT, SH, ST, TL
Calochortus nuttallii Torrey var. aureus (S. Watson) M. Ownbey		Calochortaceae
Calochortus nuttallii Torrey var. nuttallii		Calochortaceae	AA, DT, LP, ME, MF, MZ, MN, RB, SM
Calylophus berlandieri Spach		Onagraceae
Calylophus hartwegii (Bentham) Raven subsp. pubescens (A. Gray) Towner & Raven		Onagraceae	BA, LA
Calylophus lavandulifolius (Torrey & Gray) Raven	[Oenothera lavandulifolia Torrey & Gray)]	Onagraceae	BA, DT, FN, KC, LA, LO, ME, MF, MZ, MN, OT, PW, PE, RB, SM, SW, WN, WL, YM
Calylophus serrulatus (Nuttall) Raven	[Oenothera serrulata Nuttall]	Onagraceae	BA, BL, CH, CW, DV, DG, EP, EL, JF, KW, KC, LA, LN, LO, PL, SW, WN, WL, YM
Calypso bulbosa (L.) Oakes		Orchidaceae	BL, CU, EA, EP, FN, GL, GA, GN, HF, JA, JF, LR, LA, PA, RB, RT, SJ, TL
Calystegia macounii (Greene) Brummitt		Convolvulaceae	BL, JF, LR, WL
Calystegia sepium (L.) R. Brown subsp. angulata Brummitt		Convolvulaceae	BL, DV, GF, HF, KW, LR, LA, ME, MZ, PE, RT, WL
Camelina microcarpa Andrzejowski ex De Candolle		Brassicaceae	AH, AA, BA, BL, CW, CU, DT, DV, DG, EP, FN, GF, GN, HF, JA, JF, KW, KC, LP, LR, LA, LN, ME, MF, MZ, MN, PE, RB, TL
Camelina rumelica Velenovsky		Brassicaceae	BA, KW, MZ, MN, ST
Camissonia andina (Nuttall) Raven		Onagraceae
Camissonia breviflora (Torrey & Gray) Raven		Onagraceae
Camissonia eastwoodiae (Munz) Raven		Onagraceae	DT, ME
Camissonia minor (A. Nelson) Raven		Onagraceae	ME, MF
Camissonia parvula (Nuttall ex Torrey & Gray) Raven		Onagraceae	ME, MF, RB
Camissonia scapoidea (Torrey & Gray) Raven		Onagraceae	DT, ME, MF, MZ, MN, RB, SM
Camissonia subacaulis (Pursh) Raven		Onagraceae	MF, RT
Camissonia walkeri (A. Nelson) Raven		Onagraceae	ME, MZ
Campanula aparinoides Pursh		Campanulaceae
Campanula parryi A. Gray		Campanulaceae	AL, AH, AA, BL, CC, CN, CF, CT, CU, DT, DG, EA, EP, GL, GA, GN, HF, JF, LP, LA, LR, ME, ML, PA, RG, SH, TL
Campanula rapunculoides L.		Campanulaceae	BL, LR
Campanula rotundifolia L.		Campanulaceae	AH, AA, BL, CF, CC, CN, CT, CU, DT, DL, DG, EP, GF, GA, GL, GN, HF, JA, JF, LA, LP, LK, LR, ME, ML, MZ, MN, PA, PT, RB, RT, SH, SM, SJ, ST, TL
Campanula uniflora L.		Campanulaceae	AL, BL, CC, CF, CU, EA, GA, GN, LR, PA, PT, SH, SJ, ST
Campsis radicans (L.) Seemann		Bignoniaceae
Cannabis sativa L.		Cannabaceae	BL, DV, MZ
Capsella bursa-pastoris (L.) Medicus		Brassicaceae	BL, CH, CN, CT, CU, DT, DV, DL, EP, GL, GA, GN, HF, JF, LP, LA, LR, ME, ML, MF, MZ, MN, PA, PT, PE, RB, RT, SH, SM, ST
Caragana arborescens Lamarck		Fabaceae	BL, EP, GL, GA, GN, LN, PE, RB
Caragana aurantiaca Koehne		Fabaceae	EP, JF
Cardamine breweri S. Watson		Brassicaceae	LR, RT
Cardamine cordifolia A. Gray		Brassicaceae	AL, AA, BL, CC, CU, DT, DL, EA, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, MZ, OR, PA, PT, RB, RG, RT, SM, SJ, ST
Cardamine oligosperma Nutt. ex T. & G. var. oligosperma		Brassicaceae	BL, GL, GA, JA, RT
Cardamine pensylvanica Mühlenberg ex Willdenow		Brassicaceae	GL, GA, PA, RT
Cardaria chalepensis (L.) Handel-Mazzetti		Brassicaceae	AL, BL, CW, CU, DT, EA, GF, JF, ME, MF, MZ, MN, MR, PE, SM, ST, WL
Cardaria draba (L.) Desvaux		Brassicaceae	AA, BL, CH, CN, DT, GA, GN, JF, LR, LN, LO, ME, MF, MZ, MN
Cardaria latifolia (L.) Spach		Brassicaceae	AL, BL, CU, KW, JF, MF, MZ, MR, SH
Cardaria pubescens (C. A. Meyer) Jarmolenko		Brassicaceae	AL, BL, GF, GN, MF, MZ, RB, RT
Carduus acanthoides L.		Asteraceae	DG, EA, JF, PT
Carduus nutans L. subsp. macrolepis (Peterman) Kazmi		Asteraceae	BL, EP, EL, GF, GA, GN, JA, JF, KC, LP, LR, ME, MZ, MN, RB, SM, TL
Carex albo-nigra Mackenzie in Rydberg		Cyperaceae	AL, BL, CC, CU, GF, GL, GA, GN, JA, LK, LR, PA, PT, ST
Carex angustior Mackenzie in Rydberg		Cyperaceae	AA, BL, GA, GN, JA, RT
Carex aquatilis Wahlenberg		Cyperaceae	AA, BL, CF, CU, DT, DL, EA, GF, GL, GA, GN, HF, JA, LK, LR, ME, ML, PA, PT, RT, SH, SJ, ST, TL
Carex aquatilis Wahlenberg subsp. aquatilis		Cyperaceae
Carex aquatilis Wahlenberg subsp. stans (Drejer) Hulten		Cyperaceae	BL, CF, GA, LR, PA
Carex arapahoensis Clokey		Cyperaceae	BL, CF, CC, GA, GN, HF, LK, LR, PA, SJ, ST
Carex atherodes Sprengel		Cyperaceae	AL, BL, GA, GN, JA, RB, SH
Carex athrostachya Olney		Cyperaceae	BL, DL, GA, GN, JA, JF, LR, PA, RT, ST, TL
Carex atrata L.		Cyperaceae	BL, CC, LR, ML, SJ, ST, TL
Carex atrosquama Mackenzie		Cyperaceae	GN, HN, PA, SJ, ST
Carex aurea Nuttall		Cyperaceae	AA, BL, CF, CC, CU, DT, EP, GF, GL, GA, GN, JF, LP, ME, ML, MF, MN, RT, SM, SJ, TL, WL
Carex backii F. Boott		Cyperaceae	DG, LR
Carex bebbii (L. H. Bailey) Fernald		Cyperaceae	DG, EA, GN, LP, LR, PA, PT, RT
Carex bella L. H. Bailey		Cyperaceae	AL, AA, BL, CF, CC, CU, DT, DL, EP, GF, GA, GN, HN, LP, ME, MZ, PT, SH, SM, SJ, ST, TL
Carex brevior (Dewey) Mackenzie		Cyperaceae	BA, BL, DG, EP, JF, LR, LA, LN, WL, YM
Carex brevipes F. Boott		Cyperaceae	BL, CF, CU, GF, GA, GN, LP, LK, LR, RT, ST
Carex brunnescens (Persoon) Poiret in Lamarck		Cyperaceae	BL, CC, GA, LR, ME, ML, PA, RT
Carex buxbaumii Wahlenberg		Cyperaceae	EA, GA, GN, JA, LP, PA, LR, ST
Carex canescens L.		Cyperaceae	AA, BL, CF, CC, CN, DG, EA, GF, GL, GA, GN, JA, LP, LR, ME, PA, PT, RT, SH, SJ, ST
Carex capillaris L.		Cyperaceae	BL, CF, CC, EP, GF, GL, GA, GN, LP, LK, LR, PA, PT, SM, SJ, ST
Carex capitata L. subsp. arctogena (H. Smith) Bocher		Cyperaceae	CC, GA, HN, LK
Carex chalciolepis Holm		Cyperaceae	AL, BL, CF, CC, CN, CU, DL, EA, EP, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, PA, PT, RG, RT, SM, SJ, ST
Carex concinna R. Brown		Cyperaceae	CC, CF, ST
Carex crandallii Gandoger		Cyperaceae	BL, CF, CC, GL, GA, GN, HN, JA, LP, LK, LR, PT, RG, SJ, ST
Carex crawei Dewey		Cyperaceae	EP
Carex deweyana Schweinitz		Cyperaceae	AA, BL, DG, EA, GN, JF, LR, RB, RT, ST
Carex diandra Schrank		Cyperaceae	BL, GF, GA, JA, LR, SH
Carex dioica L. subsp. gynocrates (Wormskiold) Hulten		Cyperaceae	CC, GN, LK, PA
Carex disperma Dewey		Cyperaceae	BL, CF, DG, EA, EP, GF, GL, GA, GN, HN, JA, LR, ML, MF, PA, PT, RG, RT, SH, SJ, ST, TL
Carex douglasii F. Boott in Hooker		Cyperaceae	AL, BL, CC, CN, CT, DV, GF, GL, GN, JF, LR, ML, MF, MN, PA, PT, RG, SH, TL
Carex ebenea Rydberg		Cyperaceae	AL, BL, CF, CC, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, HF, LP, LK, LR, LA, ME, ML, MZ, OR, PA, PT, RG, RT, SM, SJ, TL
Carex egglestonii Mackenzie		Cyperaceae	DT, DL, EA, GF, GL, GA, GN, JA, LK, LP, MN, RT, SJ, SM, SJ
Carex elynoides Holm		Cyperaceae	AL, AA, BL, CF, CC, CT, CU, DL, GF, GL, GA, GN, HN, JA, LR, PA, PT, SH, SJ, ST
Carex emoryi Dewey in Torrey		Cyperaceae	BL, DV, DL, DG, EP, JF, LA, LO, ME, MN, RB, WL, YM
Carex engelmannii L. H. Bailey		Cyperaceae	CC, GA, GN, PT, ST
Carex epapillosa Mackenzie in Rydberg		Cyperaceae	GF, RT
Carex exsiccata L. H. Bailey		Cyperaceae	GA, RT
Carex festivella Mackenzie		Cyperaceae	BL, CC, EP, GF, GA, GN, JA, LP, LR, ME, ML, MF, PA, PT, RT, SH, SJ, ST, TL
Carex filifolia Nuttall		Cyperaceae	EP, EL, GA, JF, LN, LO, MF, SM, SW, WN, WL
Carex foenea Willdenow		Cyperaceae	AL, BL, CF, CC, DL, EA, EP, GF, GL, GA, GN, JA, LK, LR, ME, ML, PA, PT, SH, SM, SJ, ST, TL
Carex geophila Mackenzie		Cyperaceae	AL, BL, CF, GF, JF, LP, LR, LA, SH
Carex geyeri F. Boott		Cyperaceae	AA, BL, DT, DL, DG, EA, GF, GL, GA, GN, JA, LR, ME, MF, MZ, MN, OR, PA, PT, RB, RT, SH, SJ, ST
Carex gravida L. H. Bailey var. lunelliana (Mackenzie) F. J. Hermann		Cyperaceae	BA, BN, KC, LA, YM
Carex hassei L. H. Bailey		Cyperaceae	BL, DT, EP, GF, ME, MF, PA
Carex haydeniana Olney		Cyperaceae	BL, CF, CC, DL, EA, EP, GA, GN, HN, LP, LK, LR, PT, RG, SJ
Carex hoodii F. Boott in Hooker		Cyperaceae	BL, DT, EA, GF, GL, GA, GN, JA, LR, MF, RB, RT, ST
Carex hystericina Muhlenberg ex Willdenow		Cyperaceae	BA, BL, JF, LR, LA, ME, MN
Carex illota L. H. Bailey		Cyperaceae	AA, BL, CF, CC, EA, GL, GA, GN, JA, LK, LR, PA, PT, RT, SM, SJ, ST
Carex interior L. H. Bailey		Cyperaceae	BL, CU, DG, EP, GA, JA, JF, LP, LA, PA, PT, ST
Carex jonesii L. H. Bailey		Cyperaceae	BL, EA, GF, JA, PT, RB, RT
Carex lachenalii Schkuhr		Cyperaceae	BL, GA, GN, LP, LK, LR, PA, PT, SJ, ST
Carex laeviculmis Meinshausen		Cyperaceae
Carex lanuginosa Michaux		Cyperaceae	AL, BL, CF, CN, CT, CU, DG, EA, EP, GL, GA, GN, HF, JA, JF, LR, LN, ME, ML, MF, MN, PA, PT, RB, RG, RT, SH, SM, TL, WL, YM
Carex lasiocarpa Ehrhart		Cyperaceae	BL, GA, JA, LR
Carex lenticularis Michaux var. lipocarpa (Holm) L. Standley		Cyperaceae	JA, MF, MZ, MN, OR, PT, RT
Carex leptalea Wahlenberg		Cyperaceae	CC, GA, JA, PA
Carex limnophila F. J. Hermann		Cyperaceae	BL, CC, EA, GN, JF, LP, PA, PT, RT
Carex limosa L.		Cyperaceae	CC, GA, GN, JA, LR, PA, SJ, SM
Carex livida (Wahlenberg) Willdenow		Cyperaceae	JA, LR, PA
Carex macloviana D'Urville		Cyperaceae	BL, CC, GF, GL, GN, HF, ME, MF, MZ, PA, RB, RT, ST
Carex magellanica Lamarck subsp. irrigua (J. E. Smith) Hulten		Cyperaceae	BL, EA, GL, GA, JA, LR, PT, SJ
Carex maritima Gunnerus		Cyperaceae	CC, GA, GN, PA, PT, ST
Carex microglochin Wahlenberg		Cyperaceae	BL, CC, GN, PA, SJ
Carex microptera Mackenzie		Cyperaceae	BL, CF, CC, DT, DL, DG, EA, EP, GF, GA, GN, HN, HF, JA, LP, LR, LA, ME, ML, MF, MZ, MN, PA, PT, RB, RT, SH, SJ, SM, ST
Carex misandra R. Brown		Cyperaceae	BL, CC, GL, LR, PA, SJ, ST
Carex molesta Mackenzie		Cyperaceae	BA
Carex nardina E. Fries subsp. hepburnii (F. Boott) Loeve et al.		Cyperaceae	BL, CC, CF, GN, LK, LP, PA, PT, SJ, ST
Carex nebrascensis Dewey		Cyperaceae	AM, BL, CH, CC, CT, CU, DT, DG, EP, EL, GF, GA, JA, JF, LR, LN, ME, MF, MZ, RB, RT, SJ, TL, WL, YM
Carex nelsonii Mackenzie		Cyperaceae	BL, CC, CT, CU, DL, EA, EP, GL, GN, LK, LP, LR, PA, PT, SJ, ST
Carex neurophora Mackenzie in Abrams		Cyperaceae	LR, RT
Carex nigricans C. A. Meyer		Cyperaceae	AL, BL, CF, CC, EA, GL, GA, GN, HN, JA, LP, LK, LR, PA, PT, RT, SJ, ST
Carex norvegica Retzius		Cyperaceae	BL, CF, CC, CU, DT, DG, EA, EP, GF, GL, GA, GN, JA, HN, LP, LK, ML, PA, PT, RB, SH, SJ, ST
Carex norvegica Retzius subsp. norvegica		Cyperaceae
Carex norvegica Retzius subsp. stevenii (Holm) D. Murray		Cyperaceae
Carex nova A. Nelson		Cyperaceae	BL, CF, CC, CT, CU, DL, FN, GF, GL, GA, GN, HN, HF, LP, LK, LR, MZ, PA, PT, RG, SH, SJ, ST
Carex obtusata Liljeblad		Cyperaceae	AL, BL, GL, GA, GN, HN, JF, LK, LR, ME, PA, SH, SM, TL
Carex occidentalis L. H. Bailey		Cyperaceae	BA, BL, DT, DG, EA, EP, FN, GN, JF, LP, LR, LA, ME, MF, MZ, MN, PE, RB, RG, SH, SM, SJ, ST
Carex oreocharis Holm		Cyperaceae	BL, EP, GL, HF, JF, PA, TL
Carex pachystachya Chamisso ex Steudel		Cyperaceae	BL, CF, CU, GA, GN, JF, LP, LR, ME, MN, OR, PT
Carex parryana Dewey		Cyperaceae	BL, EP, GN, LR, ML, MF, MN, PA
Carex parryana Dewey subsp. hallii (Olney) D. Murray		Cyperaceae
Carex parryana Dewey subsp. parryana		Cyperaceae
Carex peckii E. C. Howe		Cyperaceae	DG, LR
Carex pelocarpa F. J. Hermann		Cyperaceae	BL, CC, GF, GN, SJ
Carex pensylvanica Lamarck subsp. heliophila (Mackenzie) W. A. Weber	[Carex inops L.H. Bailey subsp. heliophila (Mack.) Crins]	Cyperaceae	AA, BA, BL, CN, CU, DG, EP, EL, GL, GN, JF, KC, LP, LR, LN, LO, MR, PA, RG, SH, SW, TL, WL, YM
Carex perglobosa Mackenzie		Cyperaceae	BL, CF, CC, EA, GL, GA, GN, HN, LP, LK, LR, PA, PT, RG, SJ, ST
Carex petasata Dewey		Cyperaceae	BL, GA, ME, MF, MZ, MN, RB, RT, ST
Carex phaeocephala Piper		Cyperaceae	AL, BL, CF, CC, DL, EA, GL, GA, GN, JA, LP, LK, LR, ME, PA, RB, RT, SM, SJ
Carex pityophila Mackenzie		Cyperaceae	AA, BL, CF, CC, DL, JF, LR, ME, MF, MZ, MN, RB, TL
Carex praeceptorum Mackenzie		Cyperaceae	BL, EA, GL, GA, GN, HN, LR, OR, PT, RB, RT, SJ
Carex praegracilis F. Boott		Cyperaceae	AM, AL, AH, BL, CF, CH, CC, CN, CT, CU, DL, DG, EP, GF, GL, GA, JA, JF, KC, LP, LK, LR, LN, ME, ML, MF, MN, PA, RB, RG, SH, SW, ST, TL, WL, YM
Carex praticola Rydberg		Cyperaceae	BL, EP, GL, GA, GN, LR, ML, PA
Carex pseudoscirpoidea Rydberg	[Carex scirpoidea Michaux subsp. pseudoscirpoidea]	Cyperaceae	GN, LP, LK, PA, SJ, ST
Carex raynoldsii Dewey		Cyperaceae	EA, GF, GA, GN, JA, LR, ME, PT, RB, RT
Carex retrorsa Schweinitz		Cyperaceae	LP, MZ, RT
Carex rossii F. Boott in Hooker		Cyperaceae	AA, BL, CF, CC, DT, DL, EA, EP, GL, GN, JA, JF, LR, MF, MN, PA, PT, RB, RT, SJ, ST, WL
Carex rupestris Allioni subsp. drummondiana (Dewey) Holub		Cyperaceae	BL, CF, CC, GL, GA, GN, LR, PA, PT, ST
Carex sartwellii Dewey		Cyperaceae	GN, LK, WL
Carex saxatilis L. subsp. laxa (Trautvetter) Kalela		Cyperaceae	BL, CC, EA, GF, GN, JA, LP, LK, LR, ME, PA, PT, SJ, SM, ST
Carex saximontana Mackenzie		Cyperaceae	BL
Carex scirpoidea Michaux (also see C. pseudoscirpoidea)		Cyperaceae	GN, PA
Carex scoparia Schkuhr ex Willdenow		Cyperaceae	BL, EP, JF, LR
Carex scopulorum Holm		Cyperaceae	AL, BL, CF, CC, EA, GF, GL, GA, GN, HN, JA, LK, LP, LR, ME, ML, PA, PT, RT, SH, SJ, ST
Carex simulata Mackenzie		Cyperaceae	BL, CU, DT, JA, JF, LK, LR, PA, SH, TL, WL
Carex sprengelii Dewey ex Sprengel		Cyperaceae	BL, DG, LR, RB
Carex stenophylla Wahlenberg subsp. eleocharis (L. H. Bailey) Hulten	[Carex eleocharis L.H. Bailey]	Cyperaceae	AL, BL, CF, CN, DG, EP, EL, GL, GA, GN, JA, JF, KC, LR, LN, LO, PA, RB, SH, ST, TL, WL, YM
Carex stenoptila F. J. Hermann		Cyperaceae	GA, MN, PA, RT
Carex stipata Mühlenberg ex Willdenow		Cyperaceae	AA, BL, DG, EA, JF, LP
Carex sychnocephala Carey		Cyperaceae	BL
Carex tenera Dewey		Cyperaceae	RT
Carex tenuiflora Wahlenberg		Cyperaceae	PA
Carex torreyi Tuckerman		Cyperaceae	BL
Carex utriculata F. Boott		Cyperaceae	AA, BL, CF, CC, CN, CT, CU, DT, DL, EA, EL, GF, GL, GA, GN, HF, JA, JF, LP, LR, ME, ML, MF, MZ, MN, PA, PT, RB, RT, SH, SJ, SM, ST, TL
Carex vallicola Dewey		Cyperaceae	GN, ME, MF, MZ, MN, RT
Carex vernacula L. H. Bailey		Cyperaceae	BL, GL, GA, JA, LP, LK, LR, PT, SH, SJ, ST
Carex vesicaria L.		Cyperaceae	BL, DT, EA, GL, GA, GN, JA, LR, ME, RB, RT, SH, ST
Carex viridula Michaux		Cyperaceae	GN, JA, LP, PA, SJ
Carex vulpinoidea Michaux		Cyperaceae	BA, BL, JF, LA, LP, MN
Carex xerantica L. H. Bailey		Cyperaceae	BL, GL, GN, LR, MN, SM
Carthamus tinctorius L.		Asteraceae
Carum carvi L.		Apiaceae	BL, CT, CU, GA, GN, LR, RG, RT, SH, ST
Caryopteris clandonensis A. Simmonds ex Rehder		Verbenaceae	BL
Castilleja chromosa A. Nelson		Scrophulariaceae	AA, DT, DL, GF, GN, JA, LP, LR, ME, MF, MZ, MN, RB, RT, SM, ST
Castilleja flava S. Watson		Scrophulariaceae	EA, GA, JA, MF, RT, ST
Castilleja haydenii (A. Gray) Cockerell		Scrophulariaceae	AL, CT, CU, DL, HN, HF, LP, SH, SJ
Castilleja integra A. Gray in Torrey		Scrophulariaceae	AL, AH, AA, BL, CF, CN, CU, DG, EP, EL, HN, HF, JF, LP, LK, LA, ML, OT, PA, PE, RG, SH, TL
Castilleja linariifolia Bentham in De Candolle		Scrophulariaceae	AL, AA, BL, CC, CT, CU, DT, DL, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, ME, ML, MF, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SJ, SM
Castilleja lineata Greene		Scrophulariaceae	AA, CT, HN, LA
Castilleja miniata Douglas ex Hooker		Scrophulariaceae	BL, CN, DG, DL, EA, GF, GL, GA, GN, HF, JA, LP, LK, LR, LA, ME, ML, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SM, SJ, ST, TL
Castilleja minor A. Gray		Scrophulariaceae	ME, MF
Castilleja occidentalis Torrey		Scrophulariaceae	AL, BL, CF, CC, CU, DL, EA, EP, GF, GL, GA, GN, HF, JA, LP, LK, LR, MZ, OR, PA, PT, RT, SH, SJ, ST
Castilleja puberula Rydberg		Scrophulariaceae	BL, CC, LR, PA
Castilleja rhexifolia Rydberg		Scrophulariaceae	BL, CC, CN, CU, DT, DL, EA, GF, GL, GA, GN, HN, LP, LK, LR, ME, ML, MF, MZ, OR, PA, PT, RT, SH, SM, SJ, ST
Castilleja scabrida Eastwood		Scrophulariaceae	ME, MF, MN, SM
Castilleja sessiliflora Pursh		Scrophulariaceae	BA, BL, EP, EL, JF, LR, LA, LN, LO, OT, SW, WL, YM
Castilleja sulphurea Rydberg		Scrophulariaceae	AL, AA, BL, CC, CN, CT, DT, DL, DG, EA, GF, GL, GA, GN, HN, HF, JA, LK, LR, ME, ML, MN, OR, PA, RB, RG, RT, SH, SJ, ST, TL
Catabrosa aquatica (L.) P. Beauvois		Poaceae	GF, GN, LR, ME, MF, PA, RB, RT, TL, WL
Caucalis daucoides L.		Apiaceae	BL
Caulanthus crassicaulis (Torrey) S. Watson		Brassicaceae	MF, RB
Ceanothus fendleri A. Gray		Rhamnaceae	AA, BL, CF, CN, CT, CU, DG, GN, JF, LP, LR, LA, ME, ML, MZ, MN, OR, PT, PE, RB, RT
Ceanothus herbaceus Rafinesque		Rhamnaceae	BL, DG, EP, EL, JF, LR
Ceanothus martinii Jones		Rhamnaceae	GF, RB
Ceanothus velutinus Douglas ex Hooker		Rhamnaceae	BL, CC, CT, EA, GL, GA, JA, MF, MN, PT, RB, RT, ST
Celtis reticulata Torrey		Ulmaceae	BA, BL, FN, JF, LA, ME, MN, PE, YM
Cenchrus longispinus (Hackel in Kneucker) Fernald		Poaceae	BA, BL, CH, JF, KW, KC, LA, LN, LO, ME, MF, SW, WN, WL, YM
Centaurea pratensis Thuill.		Asteraceae	RT
Centaurium calycosum (Buckley) Fernald		Gentianaceae
Centaurium exaltatum (Grisebach) W. F. Wight ex Piper		Gentianaceae	LR, ME, MZ
Centaurium pulchellum (Swartz) Druce		Gentianaceae	WL
Cerastium beeringianum Chamisso & Schlechtendal subsp. earlei (Rydberg) Hulten		Alsinaceae	AL, CC, CF, DL, EP, GF, GL, GA, GN, HN, LP, LK, LR, MZ, PA, PT, SJ, ST
Cerastium fontanum Baumgartner		Alsinaceae	BL, CU, DV, DL, DG, EA, GA, GN, JF, LR, LA, ME, MZ, MN, PT, RT, SM, ST
Cerastium nutans Rafinesque var. brachypodum Engelmann ex A. Gray		Alsinaceae	BL, EP, HF, JF, LN, PE, RT
Cerastium strictum L. {emend.} Haenke	[Cerastium arvense L.]	Alsinaceae	AL, AA, BL, CF, CC, CT, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LK, LP, LR, LA, ME, ML, MF, MZ, PA, PT, RG, RT, SH, SM, ST, TL
Cerasus pensylvanica (L. f.) Loiseleur	[Prunus pensylvanica L. f.]	Rosaceae	BL, CN, CU, EP, GL, JF
Cerasus pumila (L.) Michaux subsp. besseyi (L. H. Bailey) W. A. Weber	[Prunus besseyi L.H. Bailey]	Rosaceae	BA, BL, EP, JF, LR, LO, PL, SW, WN, WL, YM
Ceratocephala orthoceras De Candolle		Ranunculaceae	BL, CH, DV, DT, DL, GF, GN, JF, LR, ME, MF, MZ, MN, RB
Ceratochloa carinata (Hooker & Arnott) Tutin	[Bromus carinatus Hooker & Arnott]	Poaceae	BL, CC, DT, DL, EA, GF, GL, GA, GN, JA, JF, LR, ME, MF, MZ, MN, RB, RT, SJ, SM, TL
Ceratochloa unioloides (Willdenow) P. Beauvois		Poaceae
Ceratophyllum demersum L.		Ceratophyllaceae	BL, GF, GA, GN, JF, SJ, YM
Cercocarpus intricatus S. Watson		Rosaceae	ME, MF, MZ, MN, SM
Cercocarpus ledifolius Nuttall ex Torrey & Gray		Rosaceae	ME, MF
Cercocarpus montanus Rafinesque		Rosaceae	AL, AA, BA, BL, CF, CN, CU, DT, DG, EA, EP, GF, GN, HF, JF, LP, LR, LA, ME, MF, MZ, MN, OT, PA, PE, RB, RT, SH, SM, TL, WL
Chaenactis alpina (A. Gray) Jones		Asteraceae	AL, CF, CC, CU, GL, GN, LP, PA, PT, ST
Chaenactis douglasii (Hooker) Hooker & Arnott		Asteraceae	AA, CF, CT, DG, EA, GF, GA, GN, HF, JA, JF, LP, LK, LR, ME, ML, MF, MZ, MN, OR, PA, PT, RB, RT, SH, ST, TL
Chaenactis stevioides Hooker & Arnott		Asteraceae	DT, ME, MF, MZ, MN, SM
Chaenorrhinum minus (L.) J. Lange in Willkomm & Lange		Scrophulariaceae	BL
Chaetopappa ericoides (A. Gray) Nesom	[Leucelene ericoides (Torrey & Gray) Greene]	Asteraceae	AA, BA, BL, CH, CN, CT, CU, DT, DL, EA, EP, FN, GN, HF, JF, KW, KC, LP, LA, ME, MF, MZ, MN, OT, PE, RB, SH, SM, YM
Chamaechaenactis scaposa (Eastwood) Rydberg		Asteraceae	DT, ME, MF, MZ, MN, RB, SM
Chamaepericlymenum canadense (L.) Ascherson & Graebner	[Cornus canadensis L.]	Cornaceae	AA, BL, DG, EP, GL, JF, ML, PA, ST
Chamaerhodos erecta (L.) Bunge subsp. nuttallii (Pickering ex Rydberg) Hulten		Rosaceae	EP, JA, JF, ML, PA, SH, TL
Chamaesaracha conioides (Moricand) Britton		Solanaceae	BA, BN, KW, LA, OT
Chamaesaracha coronopus (Dunal) A. Gray		Solanaceae	BN, CW, LP, LA, LN, MZ, OT, PW, PE
Chamaesyce fendleri (Torrey & Gray) Small	[Euphorbia fendleri Torrey & Gray]	Euphorbiaceae	BA, BL, DT, DV, EP, JF, KW, KC, LA, LN, ME, MF, MZ, MN, OT, RB, WL
Chamaesyce geyeri (Engelmann) Small	[Euphorbia geyeri Engelmann]	Euphorbiaceae	BL, CH, JF, LA, LO, MR, PL, WL
Chamaesyce glyptosperma (Engelmann) Small	[Euphorbia glyptosperma Engelmann]	Euphorbiaceae	AH, BA, BL, CH, DT, DV, EL, GN, JF, KW, KC, LR, LA, LN, ME, MF, MN, OT, SW, TL, WN, WL, YM
Chamaesyce lata (Engelmann) Small	[Euphorbia lata Engelmann]	Euphorbiaceae	BA, BN, OT, WL
Chamaesyce missurica (Rafinesque) Shinners	[Euphorbia missurica Raf. var. intermedia (Engelm.) L.C. Wheeler]	Euphorbiaceae	BA, BN, BL, CH, CW, DV, DG, EL, KW, KC, LA, LN, LO, MR, PW, SW, WN, WL, YM
Chamaesyce parryi (Engelmann) Rydberg	[Euphorbia parryi Engelmann]	Euphorbiaceae	MZ
Chamaesyce prostrata (Ait.) Small		Euphorbiaceae	AH, ME, LR
Chamaesyce revoluta (Engelmann) Small	[Euphorbia revoluta Engelmann]	Euphorbiaceae	BA, LP
Chamaesyce serpens (Humboldt, Bonpland, & Kunth) Small	[Euphorbia serpens HBK]	Euphorbiaceae	KW, LN, WL
Chamaesyce serpyllifolia (Persoon) Small	[Euphorbia serpyllifolia Persoon]	Euphorbiaceae	AM, AL, BL, CC, CN, DT, DV, EP, GN, JF, KW, KC, LR, LA, ME, ML, MF, MZ, MN, OR, SH, TL, WL
Chamaesyce stictospora (Engelmann) Small	[Euphorbia stictospora Engelmann]	Euphorbiaceae	BA, BL, CH, KW, KC, LA, PE
Chamaesyce supina (Rafinesque) Moldenke		Euphorbiaceae	AH, BL, DV, ME, GN
Chamerion danielsii D. Loeve	[Epilobium angustifolium auctt., non (L.) Scopoli]	Onagraceae	BL, CF, CC, CN, DL, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LA, LK, LP, LR, ME, ML, MZ, PA, PT, RB, RT, SH, SJ, SM, ST, TL
Chamerion subdentatum (Rydberg) Loeve & Loeve	[Epilobium latifolium auctt., non L.]	Onagraceae	BL, CF, CC, EA, GA, GN, HN, JF, LK, LP, LR, MZ, PT, SJ, ST
Cheilanthes eatonii J. G. Baker in Hooker & Baker		Pteridaceae	BA, CC, FN, LA
Cheilanthes feei T. Moore		Pteridaceae	BA, BN, BL, EA, EP, EL, FN, GN, JF, LR, LA, ME, MF, MZ, MN, PW, PE, RB, RT, SM, TL, WL
Cheilanthes fendleri Hooker		Pteridaceae	AL, BL, CF, EP, EL, FN, JF, LP, LR, LA, PE, TL
Cheilanthes wootonii Maxon		Pteridaceae	BA, PW
Chenopodium album L.		Chenopodiaceae	BL, GL, JF, RG, SH, WL
Chenopodium aridum Nelson		Chenopodiaceae	RT
Chenopodium atrovirens Rydberg		Chenopodiaceae	AL, BL, DT, EA, EP, GA, GN, JA, JF, ME, MZ, MN, PA, RB, SH, SM, TL, WL
Chenopodium berlandieri Moquin		Chenopodiaceae	AL, AH, AA, BA, BL, CH, CN, DG, EA, EP, FN, GF, GL, GA, GN, JA, JF, KW, KC, LP, LR, LA, LN, ME, ML, MF, MZ, PT, RB, RT, SW, TL, WL
Chenopodium capitatum (L.) Ascherson		Chenopodiaceae	BL, GL, GA, GN, HF, LK, LR, MN, ST
Chenopodium cycloides A. Nelson		Chenopodiaceae	BN, CH, EP, LA, LN, WL, YM
Chenopodium desiccatum A. Nelson		Chenopodiaceae	AL, BA, CH, HN, JF, LR, WL
Chenopodium foliosum (Moench) Ascherson		Chenopodiaceae	AA, BL, CN, CU, DT, DG, GF, HN, JA, JF, LP, LR, ME, ML, MF, MZ, PA, RB, RT, ST, TL
Chenopodium fremontii S. Watson		Chenopodiaceae	AL, BA, BL, DG, EA, EP, GF, GN, HF, JF, LA, LN, ME, ML, MF, MZ, MN, OR, PA, RG, SM, SJ, WL
Chenopodium glaucum L.		Chenopodiaceae	AM, AH, BL, DV, EL, FN, GN, JA, KC, LR, LN, ME, MF, MZ, MN, SH, WL, YM
Chenopodium hians Standley		Chenopodiaceae
Chenopodium incanum (S. Watson) Heller		Chenopodiaceae	AH, BA, BN, BL, CW, DT, KC, LR, LA, LN, ME, OT, PA, PW, SW, WL, YM
Chenopodium leptophyllum (Nuttall ex Moquin) S. Watson		Chenopodiaceae	BA, BL, CH, CN, EP, GL, GN, JF, LR, LA, LN, ME, ML, MF, MZ, RT, SH, TL, WL
Chenopodium leptophyllum (Nuttall ex Moquin) S. Watson var. leptophyllum		Chenopodiaceae
Chenopodium leptophyllum (Nuttall ex Moquin) S. Watson var. oblongifolium S. Watson		Chenopodiaceae
Chenopodium missouriense Aellen		Chenopodiaceae	BL, MZ
Chenopodium polyspermum		Chenopodiaceae	MZ
Chenopodium polyspermum L.		Chenopodiaceae	MZ
Chenopodium pratericola Rydberg		Chenopodiaceae	AL, AH, BL, CH, GF, JF, KW, KC, LR, LA, LN, ML, MF, OT, PA, SW, TL, WL
Chenopodium rubrum L.		Chenopodiaceae	BL, GA, JA, ME, SH, WL
Chenopodium simplex (Torrey) Rafinesque		Chenopodiaceae	BA, BL, EP, LP, LA, LO, MZ
Chenopodium strictum Roth		Chenopodiaceae	BL, WL
Chenopodium subglabrum (S. Watson) A. Nelson		Chenopodiaceae	BN, CH, EP, EL, KC, LN, LO, WN
Chenopodium watsonii A. Nelson		Chenopodiaceae	EL, HF, WL
Chimaphila umbellata (L.) W. Barton subsp. occidentalis (Rydberg) Hulten		Pyrolaceae	BL, CU, DG, EP, GA, HF, JA, JF, LR, LA, ME, RT, ST
Chionophila jamesii Bentham in De Candolle		Scrophulariaceae	AL, BL, CF, CC, CT, EA, GL, GA, GN, HN, LP, LK, LR, MZ, PA, SH, SM, SJ, ST
Chloris verticillata Nuttall		Poaceae	AH, BA, BL, CH, DV, EP, KW, KC, LA, ME, OT, YM
Chloris virgata Swartz		Poaceae	AM, BA, BN, CH, DV, KW, KC, LN, ME, WL, YM
Chlorocrepis albiflora (Hooker) W. A. Weber	[Hieracium albiflorum Hooker]	Asteraceae	BL, EA, GF, GL, GA, GN, JA, PT, RB, RT
Chlorocrepis fendleri (Schultz-Bipontinus) W. A. Weber	[Hieracium fendleri Schultz-Bipontinus]	Asteraceae	AA, BL, DG, EP, GL, LP, LR, SJ
Chlorocrepis tristis (Willdenow ex Sprengel) Loeve & Loeve subsp. gracilis (Hooker) W. A. Weber	[Hieracium gracile Hooker]	Asteraceae	AA, BL, CF, CC, CT, EA, GF, GL, GA, GN, HF, JA, LK, LR, MZ, ME, PA, PT, RT, SM, SJ, ST
Chondrophylla aquatica (L.) W. A. Weber	[Gentiana fremontii Torrey in Fremont]	Gentianaceae	BL, CC, CU, GF, GL, GN, LR, LA, ML, PA, SH, SJ, TL
Chondrophylla nutans (Bunge) W. A. Weber		Gentianaceae	GL, GN, HN, LP, LR, ML, MZ, PT, SH, ST
Chondrophylla prostrata (Haenke ex Jacquin) J. P. Anderson	[Gentiana prostrata Haenke ex Jacquin]	Gentianaceae	AL, CF, CC, CU, EP, GA, GN, HF, LK, LR, PA, PT, SH, SJ, ST
Chondrosum barbatum (Lagasca) Clayton	[Bouteloua barbata Lagasca]	Poaceae	BN, DT, PW
Chondrosum eriopodum Torrey	[Bouteloua eriopoda (Torrey) Torrey]	Poaceae	BA, LA
Chondrosum gracile Humboldt, Bonpland, & Kunth	[Bouteloua gracilis (HBK) Lagasca ex Griffiths]	Poaceae	AM, AL, AH, AA, BA, BL, CF, CH, CC, CN, CT, CW, CU, DG, EP, EL, GF, GL, GN, JF, KW, KC, LP, LR, LA, LN, LO, ME, ML, MZ, MN, MR, OT, PA, PE, RG, RT, SH, SM, SW, TL, WN, WL, YM
Chondrosum hirsutum (Lagasca) Sweet	[Bouteloua hirsuta Lagasca]	Poaceae	BA, BL, CH, JF, KC, LA, LN, LO, PL, SW, WN, WL, YM
Chondrosum prostratum (Lagasca) Sweet	[Bouteloua prostrata Lagasca]	Poaceae	AL, AA, CH, CN, DV, EP, GN, KW, KC, LP, LN, MZ, RG, TL, WL
Chorispora tenella (Pallas) De Candolle		Brassicaceae	AM, AH, BA, BL, CH, CU, EL, EP, GN, JF, LP, LR, LN, LO, ME, MF, MZ, MN, PE, RB, SW, ST, WL
Chrysanthemum coccineum Willdenow		Asteraceae	PT
Chrysanthemum coronarium L.		Asteraceae
Chrysosplenium tetrandrum (N. Lund) Th. Fries		Saxifragaceae	BL, CC, EA, GA, LR, PA, ST
Chrysothamnus depressus Nuttall		Asteraceae	AA, DL, EA, GN, LP, ME, MF, MZ, MN
Chrysothamnus greenei (A. Gray) Greene		Asteraceae	AL, CN, CT, MZ, SH
Chrysothamnus greenei (A. Gray) Greene subsp. filifolius (Rydberg) Hall & Clements		Asteraceae
Chrysothamnus greenei (A. Gray) Greene subsp. greenei		Asteraceae
Chrysothamnus linifolius Greene		Asteraceae	DT, ME, MF, MZ, MN, RB, SM
Chrysothamnus nauseosus (Pallas ex Pursh) Britton		Asteraceae	AL, AA, BA, BL, CF, CH, CC, CN, CT, CW, CU, DT, DV, DL, EA, EP, EL, FN, GF, GA, GN, HF, JA, JF, KW, KC, LP, LR, LA, LN, LO, ME, MF, MZ, MN, MR, OT, PT, RB, RG, RT, SH, SM, WN, WL
Chrysothamnus nauseosus (Pallas ex Pursh) Britton subsp. bigelovii (A. Gray) Hall & Clements		Asteraceae	HF, SH
Chrysothamnus nauseosus (Pallas ex Pursh) Britton subsp. consimilis (Greene) Hall & Clements		Asteraceae	AL, CN, CT, SH
Chrysothamnus nauseosus (Pallas ex Pursh) Britton subsp. graveolens (Nuttall) Piper		Asteraceae	AL, AA, BA, BL, CF, CH, CC, CN, CT, CW, CU, DV, DL, EL, FN, GF, GA, HF, JA, JF, KW, KC, LP, LR, LA, LN, LO, ME, MF, MZ, MN, MR, OT, PT, RB, RG, RT, SH, SM, WL
Chrysothamnus nauseosus (Pallas ex Pursh) Britton subsp. leiospermus (A. Gray) Hall & Clements		Asteraceae	ME, MF, MZ
Chrysothamnus nauseosus (Pallas ex Pursh) Britton subsp. nauseosus		Asteraceae	BA, BL, CH, CU, EA, EP, JA, JF, KW, LA, LN, RT, WN, WL
Chrysothamnus nauseosus (Pallas) Britton subsp. hololeucus (Gray) Hall & Clements		Asteraceae	JF
Chrysothamnus parryi (A. Gray) Greene		Asteraceae	BL, CC, CF, CU, DT, DL, DG, GL, GA, GN, JA, ME, ML, MF, MZ, MN, OR, PA, PT, RB, RT, SH, SJ, ST, TL
Chrysothamnus parryi (A. Gray) Greene subsp. affinis (A. Nelson) L. C. Anderson		Asteraceae	CF, CU, ML, PA, SH, TL
Chrysothamnus parryi (A. Gray) Greene subsp. attenuatus (Jones) Hall & Clements		Asteraceae	MZ
Chrysothamnus parryi (A. Gray) Greene subsp. howardii (Parry ex A. Gray) Hall & Clements		Asteraceae	EP, GA, JA, MF
Chrysothamnus parryi (A. Gray) Greene subsp. parryi		Asteraceae	BL, CF, CC, DT, GL, GA, GN, JA, ME, ML, MZ, MN, OR, PA, RB, RT, SH, SJ, ST
Chrysothamnus pulchellus (A. Gray) Greene subsp. baileyi (Wooton & Standley) Hall & Clements		Asteraceae	BA
Chrysothamnus vaseyi (A. Gray) Greene		Asteraceae	AA, CF, DL, GA, HF, JA, ME, MZ, SH
Chrysothamnus viscidiflorus (Hooker) Nuttall		Asteraceae	AL, CC, CT, CU, EA, GF, GL, GA, GN, JA, LR, ME, ML, MF, MZ, MN, PA, PT, RB, RT, SH, ST, TL
Chrysothamnus viscidiflorus (Hooker) Nuttall subsp. axillaris (Keck) L. C. Anderson		Asteraceae	MZ
Chrysothamnus viscidiflorus (Hooker) Nuttall subsp. elegans (Greene) Hall & Clements		Asteraceae
Chrysothamnus viscidiflorus (Hooker) Nuttall subsp. lanceolatus (Nuttall) Hall & Clements		Asteraceae	AL, CC, CT, GF, GL, GA, GN, JA, LR, ME, ML, MF, MN, PA, PT, RB, RT, SH, ST, TL
Chrysothamnus viscidiflorus (Hooker) Nuttall subsp. latifolius (D. C. Eaton) Hall & Clements		Asteraceae
Chrysothamnus viscidiflorus (Hooker) Nuttall subsp. puberulus (D. C. Eaton) Hall & Clements		Asteraceae
Chrysothamnus viscidiflorus (Hooker) Nuttall subsp. pumilus (Nuttall) Hall & Clements		Asteraceae
Chrysothamnus viscidiflorus (Hooker) Nuttall subsp. stenophyllus (A. Gray) Hall & Clements		Asteraceae	ME, MF
Chrysothamnus viscidiflorus (Hooker) Nuttall subsp. viscidiflorus		Asteraceae	CC, GA, ME, MF, MN, RT, TL
Cichorium intybus L.		Asteraceae	BL, EP, JF, ME, MZ
Cicuta douglasii (De Candolle) Coulter & Rose		Apiaceae	AA, BL, CN, CT, CU, DV, EA, EP, GN, HF, JA, JF, LP, LR, ME, MF, MN, RB, RG, SH, TL, WL
Ciliaria austromontana (Wiegand) W. A. Weber	[Saxifraga bronchialis L. subsp. austromontana (Wieg.) Piper]	Saxifragaceae	AL, BL, CF, CC, CU, DL, EA, EP, GF, GL, GA, GN, HN, JA, JF, LK, LP, ME, ML, MZ, MN, OR, PA, PT, RT, SH, SM, SJ, ST, TL
Cinna latifolia (Treviranus) Grisebach in Ledebour		Poaceae	AA, BL, GL, GA, GN, JA, LP, LR, RB, RT, SM
Circaea alpina L.		Onagraceae	BL, JF, LR, PE, RT
Circaea alpina L. subsp. alpina		Onagraceae
Circaea alpina L. subsp. pacifica (Ascherson & Magnus) Raven		Onagraceae
Cirsium araneans Rydberg		Asteraceae
Cirsium barnebyi Welsh & Neese		Asteraceae	GF, RB
Cirsium calcareum (Jones) Wooton & Standley		Asteraceae	AA, DT, GF, ME, MN, MZ, SM
Cirsium canescens Nuttall		Asteraceae	AL, BA, CU, DG, EP, EL, GA, JA, KC, LR, LN, LO, MR, PA, SH, SW, TL, WL, YM
Cirsium centaureae (Rydberg) K. Schumann		Asteraceae	BL, CN, EA, GA, GF, GL, JA, LP, MN, OR, RG, RT, SM
Cirsium eatonii (Gray) Robinson		Asteraceae	DT, EA, EP, GF, GA, GN, JA, LK, LR, ME, MN, PA, PT, RB, RT, ST
Cirsium flodmanii (Rydberg) Arthur		Asteraceae	BL, CC, CU, JF, LR, LO, WL
Cirsium hesperium (Eastwood) Petrak		Asteraceae	EP, GN, HN, LA, ML, PT
Cirsium neomexicanum A. Gray		Asteraceae	AA, DT, ME, MZ, MN, OR
Cirsium ochrocentrum A. Gray		Asteraceae	BA, BL, CH, CU, EA, EP, EL, GA, JF, KW, KC, LR, LA, LN, MF, OT, PA, PE, SH, SW, WL, YM
Cirsium osterhoutii (Rydberg) Petrak		Asteraceae
Cirsium ownbeyi Welsh		Asteraceae	MF
Cirsium pallidum Wooton & Standley		Asteraceae	CN
Cirsium parryi (A. Gray) Petrak		Asteraceae	CC, CN, CT, DL, GN, HN, LK, LP, ML, MZ, OR, SH, SM, SJ
Cirsium perplexans (Rydberg) Petrak		Asteraceae	DT, GF, ME, MN
Cirsium scapanolepis Petrak		Asteraceae	JA, GN
Cirsium scariosum Nuttall	[Cirsium coloradense (Rydberg) Cockerell]	Asteraceae	AA, CT, EA, GL, GA, GN, JA, ML, MF, OR, PA, RB, RT, SJ, ST, TL
Cirsium scopulorum (Greene) Cockerell		Asteraceae	AL, BL, CF, CC, CU, GL, GA, ML, PA, ST
Cirsium tracyi (Rydberg) Petrak		Asteraceae	AA, EA, GF, GN, LP, ME, MF, MZ, MN, PT, RB, SJ, SM
Cirsium tweedyi (Rydberg) Petrak		Asteraceae
Cirsium undulatum (Nuttall) Sprengel		Asteraceae	BA, CH, EL, JF, KC, LN, LO
Cirsium vulgare (Savi) Tenore		Asteraceae	AH, BL, JF, KC, LP, LN, ME, MF, MN, PT
Cladothrix lanuginosa (Nuttall ex Moquin) Bentham & Hooker		Amaranthaceae	BA, BN, MZ, PE
Claytonia lanceolata Pursh		Portulacaceae	BL, DT, EA, GF, GL, GA, GN, JA, JF, ME, MF, MZ, MN, PT, RT, ST
Claytonia megarhiza (Parry ex A. Gray) S. Watson		Portulacaceae	BL, CF, CC, DL, EA, EP, GF, GL, GA, GN, HN, LP, LK, LR, ML, MZ, OR, PA, PT, SH, SM, SJ, ST
Claytonia rosea Rydberg		Portulacaceae	BL, FN, HF, JF, LR, MZ
Claytonia rubra (Howell) Tidestrom		Portulacaceae	BL, JF
Claytonia weberiana Miller & Chambers		Portulacaceae	BL
Clematis ligusticifolia Nuttall ex Torrey & Gray		Ranunculaceae	AL, AH, AA, BL, CN, CT, CU, DV, DG, EA, EP, GF, GN, HF, JF, LP, LR, LA, ME, ML, MF, MZ, MN, OR, PT, RB, SH, TL, WL
Clementsia rhodantha (A. Gray) Rose	[Sedum rhodanthum A. Gray]	Crassulaceae	AL, BL, CF, CC, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, MZ, OR, PA, PT, RB, RT, SH, SM, SJ, ST
Cleome lutea Hooker		Capparaceae	ME, MF, MN, SM
Cleome multicaulis Sesse & Mocino ex De Candolle		Capparaceae	AL, CT, RG, SH
Cleome serrulata Pursh		Capparaceae	AL, BA, BL, CF, CH, CN, CT, CW, DT, DV, DG, EP, FN, GF, GN, HF, JA, JF, KW, KC, LP, LK, LR, LA, LN, LO, ME, ML, MF, MZ, MN, OT, RB, SH, SW, TL, WN, WL, YM
Cleomella angustifolia Torrey		Capparaceae	SW
Cleomella palmerana Jones		Capparaceae	DT, ME, MZ, MN
Clinopodium vulgare L.		Lamiaceae	LP, LA, RT
Coeloglossum viride (L.) C. J. Hartman subsp. bracteatum (Muhlenberg ex Willdenow) Hulten		Orchidaceae	BL, GA, JF, LR, LA, MZ, SJ
Coleogyne ramosissima Torrey		Rosaceae	ME
Collinsia parviflora Douglas in Lindley		Scrophulariaceae	BL, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, JF, LR, ME, MF, MZ, MN, OR, PE, RB, RT
Collomia grandiflora Douglas ex Lindley		Polemoniaceae	MZ, RB
Collomia linearis Nuttall		Polemoniaceae	AH, AA, BL, CC, CN, CT, DT, DL, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LR, LA, ME, MF, MZ, MN, PA, PT, RB, RT, SH, SM, SJ, TL
Colutea arborescens L.		Fabaceae	BL, EP, JF
Comandra umbellata (L.) Nuttall subsp. pallida (A. De Candolle) Piehl		Santalaceae	AL, AH, AA, BA, BN, BL, CN, CT, CU, DT, DG, EP, EL, FN, GF, GL, GN, HF, JA, JF, KC, LP, LR, LA, LN, LO, ME, MF, MZ, MN, PW, PE, RB, RG, SH, SM, WN, YM
Comarum palustre L.		Rosaceae	CN, GN, JA, ME, SM
Comastoma tenellum (Rottboel) Toyokuni	[Gentiana tenella Rottboel]	Gentianaceae	BL, CF, CC, EP, LR, ML, PA
Commelina dianthifolia Delile		Commelinaceae	EP, LP, LA
Commelina erecta L. var. angustifolia (Michaux) Fernald		Commelinaceae	BA, BN, KC, LA, YM
Conimitella williamsii (D. C. Eaton) Rydberg		Saxifragaceae	ST
Conioselinum scopulorum (A. Gray) Coulter & Rose		Apiaceae	AA, BL, CC, CN, CT, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, JA, LR, ME, ML, MZ, MN, PA, RB, RT, SH, SJ, ST, TL
Conium maculatum L.		Apiaceae	BA, BL, DG, JF, LA, LN, LO, ME, MR, PT, PE, RB
Conopholis alpina Liebmann var. mexicana (A. Gray ex S. Watson) Haynes		Orobanchaceae	LA
Conosilene conica (L.) Fourreau ssp. conoidea (L.) Loeve & Kjellqvist		Caryophyllaceae	JF
Conringia orientalis (L.) Dumont de Cours		Brassicaceae	AA, BL, EL, JF, LA, ME, MZ, PT, RB, WL
Convolvulus arvensis L.		Convolvulaceae	BA, BL, CH, DT, DV, DL, DG, GA, GN, JF, KW, KC, LP, LR, LA, LN, ME, MF, MZ, MN, OT, PT, RT, SH, TL
Convolvulus equitans Bentham		Convolvulaceae	BA, BN, FN, LA, OT, PW
Conyza canadensis (L.) Cronquist		Asteraceae	AL, AA, BA, BL, CH, CN, DT, EP, EL, GF, GN, JF, KW, KC, LA, LN, LO, ME, MF, MZ, MN, MR, OT, OR, PT, RB, SW, WL, YM
Conyza coulteri A. Gray		Asteraceae
Conyza schiedeana (Lessing) Cronquist		Asteraceae	EP, LP, LR
Corallorhiza maculata Rafinesque		Orchidaceae	BL, CT, CU, EP, FN, GF, GL, GA, HF, JA, JF, LR, LA, ME, ML, MN, PA, PT, PE, RB, RT, SH, SJ
Corallorhiza striata Lindley		Orchidaceae	BL, JF, LA, ME, MZ, RT, SH
Corallorhiza trifida (L.) Chatelain		Orchidaceae	BL, CU, DG, EA, GF, GA, GN, HF, JA, JF, LA, ME, RB, RT, SH, SM, ST
Corallorhiza wisteriana Conrad		Orchidaceae	BL, DG, FN, LR, ML, MN, RT
Cordylanthus ramosus Nuttall		Scrophulariaceae	JA, MF, RT
Cordylanthus wrightii A. Gray		Scrophulariaceae	DT, ME, MZ, MN, SM
Coreopsis lanceolata L.		Asteraceae
Coreopsis tinctoria Nuttall		Asteraceae	AH, BL, CT, JF, ME, SW
Coriflora hirsutissima (Pursh) W. A. Weber	[Clematis hirsutissima Pursh]	Ranunculaceae	AA, BL, CC, DL, EP, FN, GF, GA, GN, JA, JF, LP, LR, ME, MZ, MN, RB, RT, SM, ST, TL
Coriflora scottii (T. C. Porter in Porter & Coulter) W. A. Weber	[Clematis hirsutissima Pursh var. scottii Porter]	Ranunculaceae	AL, CF, CT, CU, EP, FN, HF, LA, PE, RG, SH, TL
Corispermum americanum (Nuttall) Nuttall		Chenopodiaceae	BA, EP, MF, WL
Corispermum hyssopifolium L.		Chenopodiaceae	AL, BA, WL
Corispermum navicula Mosyakin		Chenopodiaceae	JA
Corispermum villosum Rydberg		Chenopodiaceae	AL, EP
Coronaria coriacea (Moench) Shishkin & Gorschkova		Caryophyllaceae
Corydalis aurea Willdenow		Fumariaceae	AL, BA, BL, CF, CC, CN, CT, CU, DT, DL, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MN, PA, PE, RB, RG, SH, TL
Corydalis caseana A. Gray subsp. brandegei (S. Watson) G. Ownbey		Fumariaceae	AA, CN, DT, GN, ME, ML
Corydalis curvisiliqua Engelmann subsp. occidentalis (Engelmann ex A. Gray) W. A. Weber		Fumariaceae	AL, AA, BA, BL, CT, DT, EP, FN, GF, GN, JF, LR, LA, LN, ME, MF, MZ, MN, MR, OT, RG, SH, SM, WL
Corylus cornuta H. Marshall		Betulaceae	BL, DG, LR
Coryphantha missouriensis (Sweet) Britton & Rose		Cactaceae	BL, DL, FN, JF, ME, MZ, MN
Coryphantha vivipara (Nuttall) Britton & Rose var. vivipara		Cactaceae	AL, AH, AA, CH, CU, DL, DG, EP, FN, KC, LP, LR, LA, LN, MZ, MN, PW, PE, SM, WL, YM
Cosmos bipinnatus Cavanilles		Asteraceae
Cosmos parviflorus (Jacquin) Humboldt, Bonpland, & Kunth		Asteraceae	EP, LP
Crassula aquatica (L.) Schonland		Crassulaceae
Crataegus chrysocarpa Ashe		Rosaceae	BL, PE
Crataegus erythropoda Ashe		Rosaceae	AA, BL, CC, DT, EA, JF, LP, LR, ME, MF, MZ, MN, PE, RB, RT
Crataegus macracantha Loddiges var. occidentalis (Britton) Eggleston		Rosaceae	AA, BL, JF, LR, PE
Crataegus rivularis Nuttall		Rosaceae	AA, DT, EA, GF, GA, LP, ME, MF, MZ, MN, RB, RT, SH
Crataegus saligna Greene		Rosaceae	CF, EA, GF, GN, MN, PT, RB
Crataegus succulenta Schrader ex Link		Rosaceae
Crepis capillaris (L.) Wallroth		Asteraceae	CC, EA, LR
Critesion brachyantherum (Nevski) Barkworth & Dewey	[Hordeum brachyantherum Nevski]	Poaceae	BL, CU, DT, DL, EA, GF, GL, GA, GN, JF, LR, ME, ML, MF, PA, RB, RT, TL
Critesion glaucum (Steudel) Loeve		Poaceae	BA, BL, DV, JF, LR, ME, MZ, MN
Critesion jubatum (L.) Nevski	[Hordeum jubatum L.]	Poaceae	AL, AA, BA, BN, BL, CH, CT, CU, DT, DG, DL, EA, EP, EL, GF, GL, GA, GN, JA, JF, KW, KC, LP, LR, LA, LN, LO, ME, ML, MF, MZ, MN, MR, PA, PE, RB, RT, SW, TL, WL, YM
Critesion pusillum (Nuttall) Loeve	[Hordeum pusillum Nuttall]	Poaceae	AH, BA, BL, CH, DT, GF, JF, LA, ME, MN, OT, PE, SW, WL, YM
Crocanthemum bicknellii (Fernald) Janchen		Cistaceae	BL, DG, EP, JF
Croton texensis (Klotsch) Muller-Argoviensis in De Candolle		Euphorbiaceae	AH, BA, BN, CH, CW, DV, EP, EL, FN, KW, KC, LA, LN, LO, OT, PL, PW, PE, SW, WN, WL, YM
Crunocallis chamissoi (Ledebour ex Sprengel) Rydberg		Portulacaceae	BL, DG, EP, GL, GA, HF, JA, JF, LR, LA, ML, PA, RT, SH, TL
Crypsis alopecuroides (Piller & Mitterp) Schrader		Poaceae	BL
Cryptantha ambigua (A. Gray) Greene		Boraginaceae	MF, RB
Cryptantha circumscissa (Hooker & Arnott) I. M. Johnston		Boraginaceae	MF
Cryptantha crassisepala (Torrey & Gray) Greene		Boraginaceae	BA, CF, GN, LA, ME, MF, MZ, MN, OT, RT, SH, SM
Cryptantha crassisepala (Torrey & Gray) Greene var. crassisepala		Boraginaceae
Cryptantha crassisepala (Torrey & Gray) Greene var. elachantha I.M. Johnston		Boraginaceae
Cryptantha fendleri (A. Gray) Greene		Boraginaceae	AL, BL, CF, CH, CC, CN, CT, CU, EP, EL, GA, GN, LR, LA, ME, ML, MF, MZ, MN, MR, PA, RB, SH, SM, WL
Cryptantha gracilis Osterhout		Boraginaceae	DT, GF, ME, MF, MZ, MN, RB, RT, SM
Cryptantha minima Rydberg		Boraginaceae	AH, BA, BN, BL, CH, CN, CT, EL, FN, JF, KW, KC, LN, LO, MN, MR, OT, PE, SM, SW, WL, YM
Cryptantha pterocarya (Torrey) Greene		Boraginaceae	DT, ME, MZ, MN, RB
Cryptantha recurvata Coville		Boraginaceae	ME, MZ
Cryptantha scoparia A. Nelson		Boraginaceae	MF
Cryptantha watsonii (A. Gray) Greene		Boraginaceae	GA, GN, JA, MF, MN, RB
Cryptogramma acrostichoides R. Brown in Richardson		Pteridaceae	BL, CF, CC, CN, DT, EA, EP, GF, GL, GA, GN, JA, LR, ME, ML, MZ, OR, PT, RG, RT, SM, SJ, ST
Cryptogramma stelleri (S. G. Gmelin) Prantl		Pteridaceae	AA, GF, GA, GN, SM, SJ
Cucurbita foetidissima Humboldt, Bonpland, & Kunth		Cucurbitaceae	BA, BN, BL, CH, CU, EP, FN, KW, KC, LA, LN, ME, MZ, PW, PE, SW, YM
Cuscuta epithymum (L.) L. subsp. approximata (Babington) Rouy		Cuscutaceae	BL, JF
Cyclachaena xanthifolia (Nuttall) Fresenius	[Iva xanthifolia Nuttall]	Asteraceae	BA, BL, CH, DT, EP, GF, GL, GN, JF, KC, LR, LA, LN, ME, MF, MZ, MN, PT, SW, TL, WL
Cyclanthera dissecta (Torrey & Gray) Arnott		Cucurbitaceae	BA, LA, YM
Cycloloma atriplicifolium (Sprengel) Coulter		Chenopodiaceae	AL, AM, BA, BN, BL, CH, CW, EP, EL, KW, KC, LA, LN, SW, WN, WL
Cylactis arctica (L.) W. A. Weber subsp. acaulis (Michaux) W. A. Weber	[Rubus acaulis Michaux]	Rosaceae	CC, GA, PA
Cylactis pubescens (Rafinesque) W. A. Weber	[Rubus pubescens Rafinesque]	Rosaceae	BL, DG, TL
Cylindropuntia imbricata (Haworth) Knuth	[Opuntia arborescens Engelmann]	Cactaceae	CW, FN, KW, LA, LN
Cylindropuntia whipplei (Engelmann & Bigelow) Knuth	[Opuntia whipplei Engelmann & Bigelow]	Cactaceae	AA, LP, MZ
Cylindropyrum cylindricum (Host) Loeve	[Aegilops cylindrica Host]	Poaceae	AM, BA, BN, BL, JF, LR, ME, MZ, MN, WN
Cymbalaria muralis Gaertn., Mey. & Scharb.		Scrophulariaceae	BL, JF
Cymopterus acaulis (Pursh) Rafinesque		Apiaceae	AL, BA, BN, BL, CH, DV, EP, EL, FN, KW, LR, LA, LO, MF, OT, PW, SH, SW, WL, YM
Cymopterus bulbosus A. Nelson		Apiaceae	AA, DT, GF, GN, ME, MF, MZ, MN, OR, SM
Cymopterus constancei R. L. Hartman		Apiaceae	GN
Cymopterus duchesnensis Jones		Apiaceae	MF, RB
Cymopterus fendleri A. Gray		Apiaceae	AA, DT, LP, ME, MF, MZ, MN, SM
Cymopterus longilobus (Rydberg) W. A. Weber		Apiaceae	RB
Cymopterus montanus Torrey & Gray		Apiaceae	AH, BA, BL, CH, EP, HF, JF, KW, KC, LA, LN, LO, OT, PW, PE, SH, WL, YM
Cymopterus planosus (Osterhout) Mathias		Apiaceae	DT, EA, GF, ME, MF, MN, PT, RB, RT, ST
Cymopterus purpurascens (A. Gray) Jones		Apiaceae	MZ, SM
Cymopterus purpureus S. Watson		Apiaceae	AA, DT, GF, LP, ME, MF, MZ, MN, RB, SM
Cymopterus terebinthinus (Hooker) Torrey & Gray var. calcareus (Jones) Cronquist		Apiaceae	MF, RT
Cynodon dactylon (L.) Persoon		Poaceae	BL, CH, ME
Cynoglossum officinale L.		Boraginaceae	BL, DL, DG, EA, EL, GF, GA, GN, HF, JA, JF, LA, LR, ME, MF, MZ, PT, PE, RB, RT
Cynosurus cristatus L.		Poaceae
Cyperus acuminatus Torrey & Hooker		Cyperaceae	AH, BL, JF, WL
Cyperus aristatus Rottboel		Cyperaceae	AL, BL, DG, FN, JF, LR, LN, PE, WL
Cyperus erythrorhizus Muhlenberg		Cyperaceae	AM, AH, BL, EA, KC, ME, YM
Cyperus esculentus L.		Cyperaceae	LO
Cyperus odoratus L.		Cyperaceae	GN, KW, KC, LO, SW, YM
Cyperus rivularis Kunth		Cyperaceae	BL, DG, LR, YM
Cyperus sphaerolepis Boeck.		Cyperaceae	LA
Cypripedium calceolus L. subsp. parviflorum (Salisbury) Hulten	[Cypripedium pubescens Willdenow]	Cypripediaceae	CC, CU, EP, GF, JF, LP, LR, PA
Cypripedium fasciculatum Kellogg ex S. Watson		Cypripediaceae	BL, EA, GA, JA, LR, RT, ST
Cyrtorhyncha ranunculina Nuttall ex Torrey & Gray	[Ranunculus ranunculinus (Nuttall) Rydberg]	Ranunculaceae	BL, EP, GN, JF, LR
Cystopteris fragilis (L.) Bernhardi		Dryopteridaceae	AA, AL, BA, BL, CF, CC, CU, DT, DG, EA, EP, GF, GL, GA, GN, HN, HF, JF, LP, LR, LA, ME, ML, MF, MZ, MN, OR, PA, PT, PE, RB, RG, RT, SM, SJ, ST, TL
Cystopteris montana (Lamarck) Bernhardi ex Desvaux		Dryopteridaceae	CF, GA, GN, OR, SJ, ST
Cystopteris reevesiana Lellinger		Dryopteridaceae	AA, BL, DT, DG, EA, EP, FN, GF, GN, HN, HF, LR, LA, ML, MN, MZ, SJ, TL
Cystopteris tenuis (Michaux) Desvaux		Dryopteridaceae	LP
Cystopteris utahensis Windham & Haufler		Athyriaceae	MF
Dactylis glomerata L.		Poaceae	AA, BA, BL, CH, DT, DV, DL, EA, EP, GF, GL, GN, HF, JF, LP, LR, ME, MZ, MN, PT, PE, RT, ST
Dalea aurea Nuttall ex Pursh		Fabaceae	BA, EP, FN, KC, LA, SW, YM
Dalea candida Willdenow var. oligophylla (Torrey) Shinners		Fabaceae	AH, BA, BN, BL, CH, CW, CU, EP, EL, HF, JF, KW, KC, LR, LA, LN, LO, ME, MZ, OT, SW, WL, YM
Dalea cylindriceps Barneby		Fabaceae	BA, BN, CH, DV, EP, KW, LN, PW, SW, WN, WL
Dalea enneandra Nuttall		Fabaceae	BA, BN, CH, KC, LA, PW, YM
Dalea formosa Torrey		Fabaceae	BA, LA
Dalea jamesii (Torrey) Torrey & Gray		Fabaceae	BA, BN, EP, FN, HF, LA, OT, PW, PE
Dalea lanata Sprengel		Fabaceae	BA, BN, PW
Dalea leporina (Aiton) Bullock		Fabaceae	CN, DV
Dalea multiflora (Nuttall) Shinners		Fabaceae	EP, KC
Dalea nana Torrey var. nana		Fabaceae	BA, CH, PE
Dalea purpurea Ventenat		Fabaceae	BA, BN, BL, CH, CU, DV, DG, EP, JF, KW, KC, LR, LA, LN, OT, PE, SW, TL, WL, YM
Dalea tenuifolia (A. Gray) Shinners		Fabaceae	BA, LA, OT
Dalea villosa Sprengel		Fabaceae	BA, BN, CH, EP, KC, LA, OT, PL, SW, WN, WL, YM
Danthonia californica Bolander		Poaceae	LP, RT, SH
Danthonia intermedia Vasey		Poaceae	AL, BL, CF, CC, GF, GL, GA, GN, HN, JA, LK, LR, ML, MF, MZ, MN, PA, PT, RG, RT, SH, SJ, ST
Danthonia parryi Scribner		Poaceae	AL, BL, CC, CN, CU, EP, GL, HF, LK, ML, MZ, PA, RG, SH, TL
Danthonia spicata (L.) P. Beauvois ex Roemer & Schultes var. pinetorum Piper		Poaceae	BL, DG, EP, EL, JF, LR
Danthonia unispicata (Thurber) Munro		Poaceae	MF
Dasyochloa pulchella (Humboldt, Bonpland, & Kunth) Willdenow ex Rydberg		Poaceae	ME, MZ, OT
Datura stramonium L.		Solanaceae
Datura wrightii Regel		Solanaceae	EP, ME, MZ
Daucus carota L.		Apiaceae	BL, DG, JF
Delphinium andersonii A. Gray var. scaposum (Greene) Welsh		Helleboraceae	DT, ME, MZ, MN, SM
Delphinium barbeyi (Huth) Huth		Helleboraceae	BL, CF, CC, CU, DL, GF, GL, GA, GN, HF, JA, LP, LK, LR, ME, MF, MN, OR, PA, PT, RB, RG, RT, SH, SM, SJ, ST
Delphinium carolinianum Walter subsp. virescens (Nuttall) M. C. Johnston		Helleboraceae	AM, AH, BA, BL, CH, DG, HF, LA, LN, LO, OT, PE, SW, WL, YM
Delphinium geyeri Greene		Helleboraceae	BL, JF, LR, WL
Delphinium nuttallianum Pritzel ex Walpers		Helleboraceae	AA, BL, DT, DL, DG, EA, EP, EL, GF, GL, GA, GN, JA, JF, LP, LR, ME, ML, MF, MZ, MN, PE, RB, RT, SJ, SM, ST
Delphinium occidentale (S. Watson) S. Watson		Helleboraceae	GF, GA, JA, PT, RB, RT
Delphinium occidentale (S. Watson) S. Watson subsp. cucullatum (A. Nelson) Ewan		Helleboraceae
Delphinium occidentale (S. Watson) S. Watson subsp. occidentale		Helleboraceae
Delphinium occidentale (S. Watson) S. Watson subsp. quercicola Ewan		Helleboraceae
Delphinium ramosum Rydberg		Helleboraceae	AL, BL, CC, CT, EP, GL, HN, HF, JF, LR, LA, ML, MZ, PA, RB, SH, TL
Delphinium ramosum Rydberg var. alpestre (Rydberg) W. A. Weber	[Delphinium alpestre Rydberg]	Helleboraceae	AL, CT, FN, HF, LA, ML, PA, SH, ST
Delphinium ramosum Rydberg var. ramosum		Helleboraceae
Delphinium robustum Rydberg		Helleboraceae
Delphinium wootonii Rydberg		Helleboraceae	LA
Deschampsia cespitosa (L.) P. Beauvois		Poaceae	AL, BL, CF, CC, CU, DL, DG, EA, EP, GF, GL, GA, GN, HN, JA, LP, LK, LR, ME, ML, MF, PA, PT, RB, RG, RT, SH, SM, SJ, ST, TL
Deschampsia cespitosa (L.) P. Beauvois subsp. alpicola (Rydberg) Loeve et al.		Poaceae
Deschampsia cespitosa (L.) P. Beauvois subsp. cespitosa		Poaceae
Descurainia californica (A. Gray) O. E. Schulz		Brassicaceae	CU, GN, LP, ME, OR, PA, PT, SJ, SM
Descurainia incana (Bernhardi ex Fischer & Meyer) Dorn		Brassicaceae	CF, DT, EA, GF, GL, GA, LP, MZ, MN, OR, PA, RB, RT, SJ
Descurainia incisa (Engelmann ex Gray) Britton		Brassicaceae	AL, AA, BL, CF, CC, CN, CU, DT, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LR, ME, ML, MF, MN, MZ, OR, PA, RB, RG, RT, SH, ST, TL
Descurainia incisa (Engelmann ex Gray) Britton subsp. filipes (Gray) Rollins		Brassicaceae	AL, BL, DT, EP, GA, GN, LP, ME, MF, MZ, MN, PA, RB, RG, SH, ST
Descurainia incisa (Engelmann ex Gray) Britton subsp. incisa		Brassicaceae	AL, AA, BL, CF, CC, CN, CU, DT, GL, GA, HN, HF, JF, LP, LR, ML, MF, MZ, MN, OR, RT, SH, ST, TL
Descurainia incisa (Engelmann ex Gray) Britton subsp. viscosa (Rydberg) Rollins		Brassicaceae	AL, BL, GA, GN, JF, ML, MF, RT, SH
Descurainia pinnata (Walter) Britton		Brassicaceae	AL, AA, BA, BL, CW, DT, GN, HF, JF, KW, KC, LR, LA, LO, ME, MF, MZ, MN, MR, OT, RB, SM, WL
Descurainia ramosissima Rollins		Brassicaceae	AL, CN, CT, ML, PA, RG, SH
Descurainia sophia (L.) Webb ex Prantl		Brassicaceae	BA, BL, CW, CU, DL, DG, GN, JA, JF, KW, KC, LK, LR, LA, LO, ME, MF, MZ, MN, PA, RB, RT, SM, SW, ST, TL, WL
Desmanthus cooleyi (A. Eaton) Trelease		Fabaceae	BA, LA, HF
Desmanthus illinoensis (Michaux) MacMillan ex Robinson & Fernald		Fabaceae	BA, BN, CH, DV, LA, YM
Desmodium rigidum (Elliott) De Candolle		Fabaceae
Dianthus armeria L.		Caryophyllaceae	BL, JF, LR, MZ, RT
Dianthus deltoides L.		Caryophyllaceae	BL, DV
Dicentra uniflora Kellogg		Fumariaceae
Dichanthelium acuminatum (Swartz) Gould & Clark		Poaceae	BL, ME, OR
Dichanthelium acuminatum (Swartz) Gould & Clark var. sericeum (Schmoll) Freckmann		Poaceae
Dichanthelium acuminatum (Swarz) Gould & Clark var. acuminatum		Poaceae
Dichanthelium linearifolium (Scribner) Gould		Poaceae	BA, BL, JF, LA
Dichanthelium oligosanthes (Schultes) Gould var. scribnerianum (Nash) Gould		Poaceae	BA, BL, CH, DG, JF, LR, LA, MR
Dichanthelium wilcoxianum (Vasey) Freckmann		Poaceae	DG, EL
Dicoria brandegei A. Gray		Asteraceae
Digitalis purpurea L.		Scrophulariaceae	BL, JF
Digitaria californica (Bentham) Henrard		Poaceae	LA
Digitaria ischaemum (Schreber) Schreber ex Mühlenberg		Poaceae	BL, DV
Digitaria sanguinalis (L.) Scopoli		Poaceae	BL, JF, KC, ME, WN
Dimorphocarpa wislizenii (Engelmann) Rollins		Brassicaceae	MZ
Diplachne dubia (Kunth) Scribner		Poaceae	LA
Diplachne fascicularis (Lamarck) P. Beauvois		Poaceae	AL, AM, AH, BA, BN, BL, CH, DV, KW, KC, LA, LN, LO, ME, MZ, WL
Diplotaxis muralis (L.) A. De Candolle		Brassicaceae
Dipsacus fullonum L.		Dipsacaceae	BL
Dipsacus laciniatus L.		Dipsacaceae	JF
Distegia involucrata (Banks ex Sprengel) Cockerell	[Lonicera involucrata Banks ex Sprengel]	Caprifoliaceae	AA, BL, CF, CC, CN, CT, DT, DL, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, PA, PT, RB, RG, RT, SH, SM, SJ, ST, TL
Distichlis stricta (Torrey) Rydberg		Poaceae	AL, AH, BA, BN, BL, CH, CC, CW, DV, DG, EA, EL, FN, GA, JA, KW, KC, LN, LO, ME, ML, MF, MZ, PA, PE, RB, RG, SH, SM, SW, WL, YM
Dodecatheon pulchellum (Rafinesque) Merrill		Primulaceae	BL, CC, CN, CT, CU, DG, EA, EP, GF, GL, GA, GN, HF, JF, LR, LA, ME, ML, MF, MZ, MN, PA, RG, RT, SH, TL
Draba albertina Greene		Brassicaceae	BL, EA, GF, GL, GA, GN, JA, LP, LR, ME, MF, MN, PA, PT, RB, RT, SM, ST
Draba aurea M. Vahl ex Hornemann		Brassicaceae	AL, BL, CF, CC, CN, CU, DL, EA, EP, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, MZ, PA, PT, SH, SM, SJ, ST, TL
Draba borealis De Candolle		Brassicaceae	PA, ST
Draba breweri Watson var. cana (Rydberg) Rollins		Brassicaceae	BL, CF, GF, GL, GA, GN, LP, LK, LR, PA, PT, SM, SJ, ST
Draba crassa Rydberg		Brassicaceae	CF, CC, CN, EA, GA, GN, HN, LP, LK, OR, PA, PT, SH, SJ, ST
Draba crassifolia R. Graham		Brassicaceae	AL, BL, CF, CC, CN, CT, CU, DL, EA, GL, GA, GN, HN, JA, LP, LK, LR, PA, PT, RT, SH, SM, SJ, ST
Draba cuneifolia Nuttall ex Torrey & Gray		Brassicaceae	DT, ME, MZ, MN, RB, SM
Draba exunguiculata (O. E. Schulz) C. L. Hitchcock		Brassicaceae	BL, CC, GL, GA, PA, ST
Draba fladnizensis Wulfen		Brassicaceae	BL, CF, CC, EP, LR, OR, RG, SH, SJ, SM, ST
Draba globosa Payson		Brassicaceae	CC, GN, LK, ST
Draba graminea Greene		Brassicaceae	HN, LP, SJ
Draba grayana (Rydberg) C. L. Hitchcock		Brassicaceae	CC, CF, CT, GL, GA, HF, LR, PA, SH, ST
Draba helleriana Greene		Brassicaceae	AA, CN, HF
Draba incerta Payson		Brassicaceae	GN
Draba lonchocarpa Rydberg		Brassicaceae	BL, CF, EA, GA, GN, LK, LR, PA, PT, RT, SJ, ST
Draba nemorosa L.		Brassicaceae	AH, BL, DG, EP, GL, GA, GN, JF, LR, MF, MN, PA, RT, TL
Draba oligosperma Hooker		Brassicaceae	CF, EA, GN, LK, MF, PA, PT, SH, ST
Draba porsildii Mulligan		Brassicaceae	BL, GL, HF, LK, LR, PA, ST
Draba rectifructa C. L. Hitchcock		Brassicaceae	GA, GN, ML, OR, PA, RB, ST, TL
Draba reptans (Lamarck) Fernald		Brassicaceae	AH, BL, GN, JF, LR, LA, LO, ME, MF, MZ, MN, SM, WL
Draba smithii Gilg ex O. E. Schulz		Brassicaceae	AL, AA, CU, LA, ML, SH
Draba spectabilis Greene		Brassicaceae	AA, CN, DL, EA, GF, GN, HN, LP, ME, MZ, MN, OR, PT, SM, SJ
Draba streptobrachia Price		Brassicaceae	AL, CF, CC, CN, GA, HN, JA, LP, LK, LR, ML, OR, PA, PT, RG, SJ, SM
Draba streptocarpa A. Gray		Brassicaceae	BL, CC, CT, EP, GL, GA, HF, JF, LK, LR, LA, PA, ST, TL
Draba ventosa A. Gray		Brassicaceae	GN, LK, PT
Draba weberi Price & Rollins		Brassicaceae	ST
Dracocephalum parviflorum Nuttall		Lamiaceae	AA, BL, CC, CN, CT, CU, DT, EP, GF, GL, GA, GN, HF, JA, JF, LP, ME, ML, MF, MZ, MN, PA, RB, RT, SM, SJ, ST, TL, WL
Drosera rotundifolia L.		Droseraceae	GN, JA
Dryas octopetala L. subsp. hookeriana (Juzepczuk) Hulten		Rosaceae	BL, CF, CC, CU, EP, GF, GL, GA, GN, HF, LP, LK, LR, ML, PA, ST
Drymaria effusa A. Gray var. depressa (Greene) Duke		Alsinaceae	BL
Drymocallis arguta (Pursh) Rydberg	[Potentilla arguta Pursh]	Rosaceae	BL, CC, CU, DG, EP, GN, HF, JF, LR, LA, MF, MZ, MN, PT, RT, TL
Drymocallis fissa (Nuttall) Rydberg	[Potentilla fissa Nuttall]	Rosaceae	BL, CC, DG, EP, GL, GA, JA, JF, LR, PA, PE, RT, TL
Drymocallis glandulosa (Lindley) Rydberg	[Potentilla glandulosa Lindley subsp. glabrata (Rydb.) Keck]	Rosaceae	EA, RT
Dryopteris expansa (K. Presl) Fraser-Jenkins & Jermy		Dryopteridaceae	GA, LR
Dryopteris filix-mas (L.) Schott		Dryopteridaceae	BA, BL, CF, DG, EP, FN, GF, JA, JF, LP, LR, LA, MZ, MN, RG, RT, TL
Dugaldia hoopesii (A. Gray) Rydberg		Asteraceae	CT, CU, DT, EP, GF, GA, GN, HN, HF, LP, ME, ML, MZ, MN, OR, PA, PT, RB, RT, SM, SJ, ST
Dyssodia papposa (Ventenat) A. S. Hitchcock		Asteraceae	AM, AL, AA, BA, BN, BL, CH, CW, DV, DG, EP, EL, JF, KW, KC, LA, LN, LO, MZ, MN, PE, RG, SW, YM
Echinacea angustifolia De Candolle		Asteraceae	BA, BL, CU, KC, LA
Echinacea purpurea		Asteraceae	BL
Echinocereus fendleri (Engelmann) Rumpler		Cactaceae	LP, MZ
Echinocereus reichenbachii (Terschek) Haage var. perbellus (Britton & Rose) L. Benson		Cactaceae	BA, LA, OT, PE
Echinocereus triglochidiatus Engelmann		Cactaceae	AL, AA, CN, CT, CU, DT, DL, EP, FN, GF, GN, LP, ME, MF, MZ, MN, OR, PE, SH, SM
Echinocereus triglochidiatus Engelmann var. gonacanthus (Engelmann & Bigelow) Boissevain & Davidson		Cactaceae
Echinocereus triglochidiatus Engelmann var. melanacanthus (Engelmann) L. Benson		Cactaceae
Echinocereus triglochidiatus Engelmann var. triglochidiatus		Cactaceae
Echinocereus viridiflorus Engelmann		Cactaceae	AH, BA, BL, CF, CH, DG, EL, JF, LR, LA, LN, PE, SH, SW, WL
Echinochloa crus-galli (L.) P. Beauvois		Poaceae	AL, AA, BA, BL, CH, DT, DV, FN, JF, KW, KC, LP, LA, LN, LO, ME, MF, MZ, SW, WL, YM
Echinocystis lobata (Michaux) Torrey & Gray		Cucurbitaceae	AM, AL, AH, BL, DV, JF, LO, MZ, OR
Echinops sphaerocephalus L.		Asteraceae	BL, JF
Echium vulgare L.		Boraginaceae
Eichornia crassipes (Mart.) Solms		Pontederiaceae	EP
Elaeagnus angustifolia L.		Elaeagnaceae	AH, BA, BL, EP, JF, KC, LR, LN, LO, ME, MZ, YM
Elaeagnus commutata Bernhardi		Elaeagnaceae	ML, PA, TL
Elatine rubella Rydb.		Elatinaceae	EP
Elatine triandra Schkuhr		Elatinaceae	DG, GN, WL
Eleocharis acicularis (L.) Roemer & Schultes		Cyperaceae	AL, BL, EP, GL, JA, JF, LR, LN, ME, PE, RG, RT, WL
Eleocharis atropurpurea (Retzius) K. Presl		Cyperaceae
Eleocharis bolanderi A. Gray		Cyperaceae	DL, GN, MF, MZ, MN
Eleocharis elliptica Kunth var. compressa (Sullivant) Drapalik & Mohlenbrock		Cyperaceae	BL, EP, JF, LO, MZ
Eleocharis montevidensis Kunth		Cyperaceae	ME
Eleocharis obtusa (Willdenow) Schultes		Cyperaceae	BL, EP, JF
Eleocharis obtusa (Willdenow) Schultes var. detonsa (A. Gray) Drapalik & Mohlenbrock		Cyperaceae
Eleocharis obtusa (Willdenow) Schultes var. obtusa		Cyperaceae
Eleocharis palustris (L.) Roemer & Schultes		Cyperaceae	AM, AL, AH, BA, BN, BL, CH, CW, DT, DV, DL, DG, EL, GF, GL, GA, GN, JA, JF, KW, KC, LR, LA, LN, LO, ME, ML, MF, MZ, MN, OT, PA, PT, PE, RB, RT, SH, SW, SM, TL, WL, YM
Eleocharis parvula (Roemer & Schultes) Link var. anachaeta (Torrey) Svenson		Cyperaceae	BL, EL, JF, KW, WL
Eleocharis quinqueflora (F. X. Hartman) Schwartz		Cyperaceae	BL, CF, CU, EA, GL, GA, GN, HN, LK, LR, ML, MF, PA, RT, ST, WL
Eleocharis rostellata Torrey		Cyperaceae	AA, BL, DT, LP
Eleocharis wolfii A. Gray		Cyperaceae	LO
Eleocharis xyridiformis (Fernald) Brackett		Cyperaceae	BL, LO
Eleusine indica (L.) Gaertner		Poaceae	DV
Ellisia nyctelea (L.) L.		Hydrophyllaceae	BA, BL, EL, KW, KC, LR, LA, LN, LO, MF, MZ, SW, WL, YM
Elodea bifoliata St. John		Hydrocharitaceae	BL, LA
Elodea canadensis Richardson in Michaux		Hydrocharitaceae	BL, JA, GA, GN
Elodea longivaginata St. John		Hydrocharitaceae
Elodea nuttallii (Planchon) St. John		Hydrocharitaceae	BL, GN, LA
Elymus canadensis L.		Poaceae	AL, BA, BL, DT, DL, DG, EP, EL, GL, JF, KW, KC, LA, LN, LO, ME, MF, MN, RT, SW, WL, YM
Elymus elymoides (Rafinesque) Swezey	[Sitanion hystrix (Nuttall) J.G. Smith]	Poaceae	AL, BL, CF, DT, DG, DL, EA, EL, GF, GN, JF, KW, KC, LP, LR, LN, ME, MF, MN, PA, RB, SJ, TL
Elymus glaucus Buckley		Poaceae	BL, DT, DL, EA, GF, GL, GA, GN, JA, LR, MZ, MN, PT, RB, RT, SJ, SM, ST
Elymus lanceolatus (Scribner & Smith) Gould	[Agropyron albicans, A. dasystachum var. riparium, A. griffithsii, etc.]	Poaceae	BL, CF, CT, DG, EA, EP, GL, GA, GN, JA, JF, LR, MF, MN, PA, RB, RT, SH, WL
Elymus longifolius (J. G. Smith) Gould	[Sitanion longifolium J.G. Smith]	Poaceae	AL, AA, BA, BL, CF, CH, CN, CT, CU, DT, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, LA, LO, ME, ML, MF, MZ, MN, MR, OR, PA, PT, RB, RG, RT, SH, SM, SW, TL, WL
Elymus macounii Vasey		Poaceae	EL, JF, SH, TL, WL
Elymus multisetus (J. G. Smith) Davy		Poaceae	MF
Elymus saundersii Vasey		Poaceae	GN
Elymus saxicola Scribner & Smith		Poaceae	ME
Elymus scribneri (Vasey) Jones	[Agropyron scribneri Vasey]	Poaceae	AL, BL, CF, CC, CN, CT, CU, DL, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, PA, PT, RG, SH, SJ, ST
Elymus trachycaulus (Link) Gould ex Shinners		Poaceae	AM, AL, AA, BL, CF, CC, CN, CT, CU, DT, DL, DG, EP, EL, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, LA, LN, ME, ML, MF, MZ, MN, PA, PT, RB, RG, RT, SH, SJ, SM, ST, TL, WL
Elymus trachycaulus (Link) Gould ex Shinners subsp. andinus (Scribner & Smith) Loeve & Loeve		Poaceae
Elymus trachycaulus (Link) Gould ex Shinners subsp. bakeri (E. Nelson) Loeve		Poaceae
Elymus trachycaulus (Link) Gould ex Shinners subsp. subsecundus (Link) Loeve & Loeve		Poaceae
Elymus trachycaulus (Link) Gould ex Shinners subsp. trachycaulus		Poaceae
Elymus virginicus L.		Poaceae	JF
Elytrigia repens (L.) Nevski	[Agropyron repens (L.) P. Beauvois]	Poaceae	BL, DL, EA, EP, GF, GL, GN, JF, LP, LR, LA, LO, ME, ML, MF, MZ, MN, PT, RB, RT, SH, SM, SW, ST, TL
Enceliopsis nudicaulis (A. Gray) A. Nelson		Asteraceae	MF
Enceliopsis nutans (Eastwood) A. Nelson		Asteraceae	DT, ME
Engelmannia peristenia (Rafinesque) Goodman & Lawson		Asteraceae	BA, EP, LA, PW
Enneapogon desvauxii P. Beauvois		Poaceae
Ephedra torreyana S. Watson		Ephedraceae	DT, ME, MF, MZ, MN, SM
Ephedra viridis Coville		Ephedraceae	DT, GF, ME, MF, MZ, MN, SM
Ephedra viridis Coville var. viridis		Ephedraceae
Ephedra viridis Coville var. viscida (Cutler) L. Benson		Ephedraceae
Epilobium anagallidifolium Lamarck		Onagraceae	BL, CC, GL, GA, GN, HN, JA, LP, LK, LR, PA, PT, SM, SJ
Epilobium brachycarpum K. Presl		Onagraceae	AA, BL, CC, CT, DT, DL, EP, GF, GA, GN, JA, JF, LP, LR, ME, ML, MF, MZ, MN, OR, PT, RB, RT, TL
Epilobium brevistylum Barbey		Onagraceae
Epilobium ciliatum Rafinesque subsp. glandulosum (Lehmann) Hoch & Raven		Onagraceae	AL, AA, BL, CF, CC, CN, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LR, LN, ME, ML, MF, MZ, MN, PA, RB, RG, RT, SH, TL, WL
Epilobium clavatum Trelease		Onagraceae	CF, GF, GA, GN, HF, JA, LR, MF, PA, PT, RT
Epilobium halleanum Haussknecht		Onagraceae	BL, CN, GF, GA, GL, GN, JA, LK, LR, ME, MF, MN, MZ, RG, RT
Epilobium hirsutum L.		Onagraceae	JF
Epilobium hornemannii Reichenbach		Onagraceae	BL, CF, CC, DT, DL, EA, GL, GA, GF, GN, HF, JA, LP, LR, MZ, PA, PT, RT, SH, SJ, ST
Epilobium lactiflorum Haussknecht		Onagraceae	BL, DT, DL, EA, GF, GL, GA, GN, HF, LP, LR, ME, MZ, PA, RT, SM
Epilobium leptocarpum Haussknecht var. macounii Trelease		Onagraceae
Epilobium leptophyllum Rafinesque		Onagraceae	BL, CC, JF, LK, PA, WL, YM
Epilobium palustre L. var. grammadophyllum Haussknecht		Onagraceae
Epilobium saximontanum Haussknecht		Onagraceae	AA, BL, CC, CN, CT, DT, EA, GF, GA, GN, JA, LP, LR, ME, ML, MZ, PA, PT, RB, RT, SH, SJ, ST, TL
Epipactis gigantea Douglas ex Hooker		Orchidaceae	AA, CF, DT, ME, MF, MZ, MN
Epipactis helleborine (L.) Crantz		Orchidaceae	BL
Equisetum arvense L.		Equisetaceae	AL, AA, BL, CF, CN, CT, CU, DT, DG, EA, EP, GF, GL, GA, GN, HF, JF, LP, LR, ME, ML, MF, MZ, MN, PA, PE, RB, RT, SH, SJ, SM, ST, TL
Equisetum pratense Ehrhart (annotated to E. arvense)		Equisetaceae
Eragrostis barrelieri Daveau in Morot		Poaceae	AM, CH, DV, JF, ME, WN, YM
Eragrostis cilianensis (Allioni) F. T. Hubbard		Poaceae	AM, BA, BL, CH, DV, EP, EL, FN, GN, JF, KW, KC, LA, LN, LO, ME, SW, WL
Eragrostis curtipedicellata Buckley		Poaceae
Eragrostis curvula (Schrader) Nees		Poaceae	DV, EP, FN, JF, LA
Eragrostis diffusa Buckley		Poaceae	AM, AH, BL, JF, LA, WL
Eragrostis hypnoides (Lamarck) Britton, Sterns, & Poggenberg		Poaceae	AM, AH, WL
Eragrostis lutescens Scribner		Poaceae	JF
Eragrostis mexicana (Hornemann) Link subsp. virescens (J. Presl in K. Presl) Koch & Sanchez		Poaceae	LO, ME, YM
Eragrostis minor Host		Poaceae	BA, BL, JF, KW, LA, LN, ME, MZ
Eragrostis pectinacea (Michaux) Nees		Poaceae	AM, BL, KC, LN, MZ
Eragrostis pilosa (L.) P. Beauvois		Poaceae	AL, BL, DG, EP, FN, JF, KC, LA, LO, WN
Eragrostis secundiflora J. Presl in K. Presl subsp. oxylepis (Torrey) S. D. Koch		Poaceae	BA, KC, LR, LA, YM
Eragrostis spectabilis (Pursh) Steudel		Poaceae	BA, KC, LA
Eragrostis trichodes (Nuttall) Wood		Poaceae	AH, BA, BN, BL, CH, EP, JF, KC, LA, LN, MF, WN, WL, YM
Eremogone congesta (Nuttall ex Torrey & Gray) Ikonnikov	[Arenaria congesta Nuttall ex Torrey & Gray]	Alsinaceae	CF, DT, DL, GN, JA, LK, ME, MF, MZ, MN, PA, PT, RB, RT, SM
Eremogone fendleri (A. Gray) Ikonnikov	[Arenaria fendleri A. Gray]	Alsinaceae	AL, BL, CF, CC, CU, DT, DV, DL, DG, EP, GF, GL, GA, GN, HF, JA, JF, LP, LR, LA, ME, ML, MZ, MN, PA, RG, RT, SH, SJ, SM, ST, TL
Eremogone hookeri (Nuttall ex Torrey & Gray) W. A. Weber subsp. desertorum (Maguire) W. A. Weber	[Arenaria hookeri Nuttall ex Torrey & Gray var. desertorum Maguire]	Alsinaceae	MF
Eremogone hookeri (Nuttall ex Torrey & Gray) W. A. Weber subsp. hookeri	[Arenaria hookeri Nuttall ex Torrey & Gray]	Alsinaceae	BN, CF, EL, KC, LA, LO, OT, PE, WL, YM
Eremogone hookeri (Nuttall ex Torrey & Gray) W. A. Weber subsp. pinetorum (A. Nelson) W. A. Weber	[Arenaria hookeri Nuttall ex Torrey & Gray var. pinetorum (A. Nelson) Maguire]	Alsinaceae	BA, EL, JF, LR, LA, OT, PE, YM
Eremogone hookeri (Nuttall ex Torrey & Gray) W.A. Weber	[Arenaria hookeri Nuttall ex Torrey & Gray]	Alsinaceae	BA, BN, CF, EL, JF, KC, LR, LA, MF, OT, PE, WL, YM
Eremogone kingii (S. Watson) Ikonnikov subsp. uintahensis (A. Nelson) W. A. Weber	[Arenaria kingii (S. Watson) Jones subsp. uintahensis (A. Nelson) Maguire]	Alsinaceae	GF, ME, MF, MZ, MN, RB, SM
Eremopyrum triticeum (Gaertner) Nevski		Poaceae	AH, DT, GN, ME, MZ, MN
Erianthus ravennae (L.) Beauvois		Poaceae	JF
Eriastrum diffusum (A. Gray) Mason		Polemoniaceae	ME, MZ
Ericameria discoidea (Nuttall) Nesom	[Macronema discoideum Nuttall]	Asteraceae	CF, CC, GN, LK, PA, ST
Erigeron aphanactis (A. Gray) Greene		Asteraceae
Erigeron argentatus Gray		Asteraceae	MZ
Erigeron bellidiastrum Nuttall		Asteraceae	AH, BA, BN, CH, CW, KW, KC, LA, LN, LO, MR, PL, SW, WN, WL, YM
Erigeron caespitosus Nuttall		Asteraceae	JA
Erigeron canus A. Gray		Asteraceae	AH, BL, CC, CU, DG, EP, EL, GN, JF, KC, LA, LO, ML, OT, SH, SW, TL, WL, YM
Erigeron colo-mexicanus A. Nelson		Asteraceae	AL, BA, BL, CU, DL, DG, EP, JF, LR, LA, MZ, OT, RG
Erigeron compositus Pursh		Asteraceae	AL, BL, CF, EA, EP, FN, GF, GL, GA, GN, HN, JA, JF, LP, LR, ME, ML, MF, OR, PA, PT, SM, SJ, ST, WL
Erigeron concinnus (Hooker & Arnott) Torrey & Gray		Asteraceae	DT, GF, GN, ME, MF, MN, MZ, RB, SM
Erigeron consimilis Cronquist		Asteraceae	MF
Erigeron coulteri T. C. Porter		Asteraceae	AA, BL, CU, DT, DL, EA, GF, GA, GN, HN, HF, JA, LP, LR, ME, ML, MZ, MN, OR, PA, PT, RB, RT, SH, SM, SJ, ST
Erigeron divergens Torrey & Gray		Asteraceae	AL, AA, BA, BL, CN, CU, DT, DG, EP, EL, GL, GA, GN, HF, JF, LP, LA, ME, MF, MZ, MN, MR, PT, PE, RB, RT, SH, SJ
Erigeron eatonii A. Gray var. eatonii		Asteraceae	CF, DT, EA, GF, GA, GN, ME, MF, MZ, MN, RB, ST
Erigeron elatior (A. Gray) Greene		Asteraceae	BL, CC, CN, CU, DT, DL, EA, EP, GF, GL, GA, GN, JA, LP, LR, LA, ML, MZ, MN, OR, PA, PT, RB, RT, SH, SM, SJ, ST
Erigeron engelmannii A. Nelson		Asteraceae	CN, GF, GA, GN, HF, ME, MF, MZ, MN, RB, RT, ST
Erigeron eximius Greene		Asteraceae	AA, BL, CN, DG, GL, GA, GN, HF, JA, JF, LR, LA, ML, OR, PA, PT, SH, SJ
Erigeron flagellaris A. Gray		Asteraceae	AL, AA, BL, CN, CU, DT, DL, EA, EP, GF, GL, GA, GN, HF, JF, LP, LR, LA, LN, ME, ML, MF, MZ, MN, OR, PA, PE, RB, RG, RT, SH, SM, SJ, ST, TL, WL
Erigeron flagellaris A. Gray fma breviligulatus W. A. Weber		Asteraceae	BL, JF
Erigeron formosissimus Greene		Asteraceae	AA, BL, CF, CC, CN, CU, DG, EA, EP, GF, GL, GA, GN, HN, HF, JF, LP, LK, LA, ML, OR, PA, PT, RT, SH, SM, SJ, ST, TL
Erigeron formosissimus Greene var. formosissimus		Asteraceae
Erigeron formosissimus Greene var. viscidus (Rydberg) Cronquist		Asteraceae
Erigeron fraternus Greene		Asteraceae	CU, GN, LR, ML, PA, RT
Erigeron glabellus Nuttall		Asteraceae	AL, CC, CN, CT, EP, GA, GN, JA, LK, ML, MF, PA, PT, RG, RT, SH,
Erigeron grandiflorus Hooker		Asteraceae	BL, CF, CC, CU, EP, GA, GN, LP, LK, PA, PT, SJ, ST
Erigeron humilis R. Graham		Asteraceae	GN, HN, PT, SJ
Erigeron katchinensis Welsh & Moore		Asteraceae	MN, SM
Erigeron lanatus Hooker		Asteraceae	GN, PT
Erigeron leiomerus A. Gray		Asteraceae	AL, BL, CF, CC, CU, DT, DL, EA, GF, GL, GA, GN, JA, LR, LP, ME, MZ, PA, PT, RG, RT, SH, ST
Erigeron melanocephalus A. Nelson		Asteraceae	AL, BL, CF, CC, CU, EA, GF, GL, GA, GN, HN, JA, LP, LR, MZ, PA, PT, RT, SH, SJ, ST
Erigeron nematophyllus Rydberg		Asteraceae	GA, GN, JA, MF, PA, RT
Erigeron ochroleucus Nuttall		Asteraceae	WL
Erigeron peregrinus (Banks ex Pursh) Greene subsp. callianthemus (Greene) Cronquist		Asteraceae	AL, BL, CF, CC, DL, EA, GF, GL, GA, GN, JA, LP, LK, LR, ME, MZ, OR, PA, PT, RG, RT, SH, SJ, ST
Erigeron philadelphicus L.		Asteraceae	AA, LP
Erigeron pinnatisectus (A. Gray) A. Nelson		Asteraceae	AL, BL, CF, CC, CN, CU, DL, EP, GF, GL, GA, GN, JA, LP, LK, LR, ME, PA, PT, RG, RT, SH, SJ, ST
Erigeron pulcherrimus Heller		Asteraceae	DT, ME, MF, MN, RB
Erigeron pumilus Nuttall		Asteraceae	AH, BL, CF, CH, CN, CT, CU, EP, EL, HF, JF, KW, LR, LA, LN, LO, PE, SH, WL
Erigeron pumilus Nuttall var. concinnoides Cronquist		Asteraceae
Erigeron pumilus Nuttall var. pumilus		Asteraceae
Erigeron simplex Greene		Asteraceae	AL, AA, BL, CF, CC, CU, DL, EA, EP, GF, GL, GA, GN, HF, JA, LK, LP, LR, PA, PT, RT, SH, SM, SJ, ST
Erigeron speciosus (Lindley) De Candolle		Asteraceae	AA, BL, CT, DT, DL, DG, EA, EP, GF, GL, GA, GN, JA, JF, LP, LR, LA, ME, ML, MZ, MN, OR, PT, RB, RG, RT, SH, SM, SJ
Erigeron speciosus (Lindley) De Candolle var. macranthus (Nuttall) Cronquist		Asteraceae
Erigeron speciosus (Lindley) De Candolle var. speciosus		Asteraceae
Erigeron subtrinervis Rydberg		Asteraceae	AL, BL, CF, CC, CN, CT, CU, DG, EP, GF, GL, GA, HF, JA, JF, LK, ME, ML, PA, RB, RG, RT, SH, TL
Erigeron uintahensis Cronquist		Asteraceae	MF
Erigeron ursinus D. C. Eaton		Asteraceae	CF, CC, EA, GF, GA, GN, HN, JA, LK, LR, PA, PT, RT, ST
Erigeron utahensis A. Gray		Asteraceae	ME, MZ, MN
Erigeron utahensis A. Gray var. sparsifolius (Eastwood) Cronquist		Asteraceae
Erigeron utahensis A. Gray var. tetrapleuris (A. Gray) Cronquist		Asteraceae
Erigeron vagus Payson		Asteraceae	GN, LP, PA, PT, SJ, ST
Erigeron vetensis Rydberg		Asteraceae	AL, BL, CF, CU, DG, EP, EL, GL, GA, GN, JF, LK, LR, LA, ML, PA, RG, SH, ST, TL
Erigeron vreelandii Greene		Asteraceae	SH
Erigeron wilkenii O'Kane		Asteraceae	MF
Eriochloa contracta A. S. Hitchcock		Poaceae	PW
Eriogonum acaule Nuttall		Polygonaceae	MF
Eriogonum annuum Nuttall		Polygonaceae	BA, BN, BL, CH, DV, DG, EP, KW, KC, LA, LN, LO, MR, PL, PW, SW, WN, WL, YM
Eriogonum batemanii Jones		Polygonaceae	MF
Eriogonum bicolor Jones		Polygonaceae	ME
Eriogonum brandegei Rydberg		Polygonaceae	CF, FN, PA
Eriogonum brevicaule Nuttall		Polygonaceae	BL, GA, JA, LR, ME, MF, RB, RT, ST
Eriogonum cernuum Nuttall		Polygonaceae	AL, CF, CN, CT, DL, GN, JA, LK, LR, LA, ME, ML, MF, MZ, MN, PA, RG, RT, SH, TL
Eriogonum clavellatum Small		Polygonaceae	MZ
Eriogonum coloradense Small		Polygonaceae	GN, PA, SH
Eriogonum contortum Small in Rydberg		Polygonaceae	ME
Eriogonum corymbosum Bentham in A De Candolle		Polygonaceae	ME, MF, MN
Eriogonum corymbosum Bentham in A. De Candolle var. corymbosum		Polygonaceae	MF, MN
Eriogonum corymbosum Bentham in A. De Candolle var. orbiculatum (S. Stokes) Reveal & Brotherson		Polygonaceae	ME, MN
Eriogonum divaricatum Hooker		Polygonaceae	MZ
Eriogonum effusum Nuttall		Polygonaceae	AM, AL, AH, BN, BL, CF, CH, CW, CU, DV, EP, EL, HF, JF, KW, KC, LR, LA, LN, LO, MR, SH, ST, EL
Eriogonum ephedroides Reveal		Polygonaceae	RB
Eriogonum exilifolium Reveal		Polygonaceae	GA, JA, LR
Eriogonum fendlerianum (Bentham in De Candolle) Small		Polygonaceae	FN, LA, MZ, OT, PE
Eriogonum flavum Nuttall		Polygonaceae	AL, BL, CF, CC, EP, GL, GA, GN, HN, JF, LR, LO, ME, ML, MF, MN, PA, SH, SJ, ST, WN
Eriogonum flavum Nuttall ex Bentham subsp. chloranthum (Greene) Stokes	[Eriogonum jamesii Bentham in A. De Candolle var. xanthum]	Polygonaceae	AL, BL, CF, CC, EP, GL, GA, HN, LR, LO, ML, PA, SH, SJ, ST, WN
Eriogonum flavum Nuttall ex Bentham subsp. flavum	[Eriogonum jamesii Bentham in A. De Candolle var. flavescens S. Watson]	Polygonaceae	BL, GN, JF, LR, ME, ML, MF, MN
Eriogonum gordonii Bentham		Polygonaceae	DT, EP, FN, ME, MF, MZ, MN, OT, PE, RB, SM
Eriogonum heracleoides Nuttall		Polygonaceae	MF
Eriogonum hookeri S. Watson		Polygonaceae	DT, GF, ME, MZ
Eriogonum inflatum Torrey & Fremont		Polygonaceae	DT, ME, MZ, MN, RB
Eriogonum inflatum Torrey & Fremont var. fusiforme (Small) Reveal		Polygonaceae
Eriogonum inflatum Torrey & Fremont var. inflatum		Polygonaceae
Eriogonum jamesii Bentham in A. De Candolle		Polygonaceae	AM, AL, AA, BA, BL, CF, CN, CT, CU, EP, HF, JF, LP, LR, LA, MZ, RG, SH
Eriogonum lachnogynum Torrey ex Bentham in A. De Candolle		Polygonaceae	BA, BN, EP, FN, LA, OT, PE, SH
Eriogonum leptocladon Torrey & Gray		Polygonaceae	ME, MZ
Eriogonum leptocladon Torrey & Gray var. leptocladon		Polygonaceae	ME, MZ
Eriogonum leptocladon Torrey & Gray var. ramosissimum (Eastwood) Reveal		Polygonaceae
Eriogonum leptophyllum (Torrey) Wooton & Standley		Polygonaceae	MZ
Eriogonum lonchophyllum Torrey & Gray		Polygonaceae	AA, DT, DL, EA, GF, GN, JF, LP, ME, MF, MZ, MN, RB, SM
Eriogonum microthecum Nuttall		Polygonaceae	CN, CT, LP, ME, MF, MZ, MN, RB, SM
Eriogonum microthecum Nuttall var. laxiflorum Hooker		Polygonaceae
Eriogonum microthecum Nuttall var. simpsonii (Bentham in A. De Candolle) Reveal		Polygonaceae
Eriogonum ovalifolium Nuttall		Polygonaceae	DT, GF, LP, ME, MF, MZ, RB
Eriogonum palmerianum Reveal in Munz		Polygonaceae	ME, MZ
Eriogonum pauciflorum Pursh		Polygonaceae	LO, WL
Eriogonum pauciflorum Pursh var. gnaphalodes (Bentham in Hooker) Reveal		Polygonaceae	LO, WL
Eriogonum pauciflorum Pursh var. pauciflorum		Polygonaceae
Eriogonum pelinophilum Reveal		Polygonaceae	DT, MN
Eriogonum racemosum Nuttall		Polygonaceae	AA, CN, DL, GN, HN, LP, LA, ME, MZ, MN, OR, RG
Eriogonum rotundifolium Bentham in A. De Candolle		Polygonaceae
Eriogonum saurinum Reveal		Polygonaceae	MF
Eriogonum scabrellum Reveal		Polygonaceae	ME, MZ
Eriogonum shockleyi S. Watson var. longilobum (S. Stokes) Reveal		Polygonaceae	GF, ME, MF, MZ, SM
Eriogonum subalpinum Greene		Polygonaceae	BL, CC, DT, EA, GF, GL, GA, GN, JA, LK, LR, PA, RB, RT, SH, ST
Eriogonum tenellum Torrey		Polygonaceae	BA, BN, LA, OT, PE
Eriogonum tumulosum (Barneby) Reveal		Polygonaceae	MF
Eriogonum umbellatum Torrey		Polygonaceae	AH, BL, CC, CT, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, JA, JF, LP, LK, LR, ME, MF, MZ, MN, PA, PT, RB, RT, SH, SM
Eriogonum umbellatum Torrey subsp. subaridum (S. Stokes) Munz in Munz & Keck		Polygonaceae
Eriogonum umbellatum Torrey var. aureum (Gandoger) Reveal		Polygonaceae	CT, CU, DT, EA, GF, GN, JA, ME, MF, MZ, MN, RB, RT, SM
Eriogonum umbellatum Torrey var. porteri (Small) S. Stokes		Polygonaceae	GN, LP, PT
Eriogonum umbellatum Torrey var. umbellatum		Polygonaceae	AH, BL, CC, DL, DG, EP, GL, GA, JA, JF, LP, LK, LR, MF, MZ, PA, SH
Eriogonum viridulum Reveal		Polygonaceae	MF
Eriogonum wetherillii Eastwood		Polygonaceae	MZ
Erioneuron pilosum (Buckley) Nash		Poaceae	BA, BN, EP, FN, LA, ME, MZ, MN, OT, PW, PE
Eriophorum altaicum Meinshausen var. neogaeum Raymond		Cyperaceae	GN, HN, LP, PA, SJ, SM
Eriophorum angustifolium Honckeny		Cyperaceae	AA, BL, CC, CN, CU, DG, EP, GL, GA, GN, JA, JF, LR, LA, PA, SJ, SM, ST
Eriophorum chamissonis C.A. Meyer		Cyperaceae	EA, LP, PT, SJ
Eriophorum gracile W.D.J. Koch in Roth		Cyperaceae	BL, JA, LA, PA, SM, ST
Eritrichum aretioides (Chamisso) De Candolle		Boraginaceae	BL, CF, CC, CU, EA, EP, GL, GA, GN, HF, LK, LR, PA, PT, RG, RT, SH, ST
Erocallis triphylla (S. Watson) Rydberg		Portulacaceae	GA, RT
Erodium cicutarium (L.) L'Heritier		Geraniaceae	AH, AA, BL, CH, CU, DT, EP, EL, GF, GN, JF, LP, LR, LA, LN, ME, MF, MZ, MN, TL
Eryngium planum L.		Apiaceae	DV
Erysimum asperum (Nuttall) De Candolle		Brassicaceae	AM, AH, BA, CH, CT, CU, EP, EL, JF, KC, LR, LA, LN, LO, MF, OT, PW, RT, SW, WN, WL, YM
Erysimum capitatum (Douglas) Greene		Brassicaceae	AL, AA, BL, CF, CC, CN, CU, DT, DL, DG, EA, EP, EL, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, OR, PA, PT, PE, RB, RG, SH, SM, SJ, ST, TL
Erysimum cheiranthoides L. subsp. altum Ahti		Brassicaceae	BL, GA, GN, HF, LR, PA, PT, RT, SH, WL
Erysimum inconspicuum (S. Watson) MacMillan		Brassicaceae	AA, LP, LA, MZ, RG, SH
Erysimum repandum L.		Brassicaceae	AA, BA, BL, DT, JF, LN, ME, MZ, MN, RB
Erythrocoma triflora (Pursh) Greene	[Geum triflorum Pursh]	Rosaceae	AA, BL, CF, CC, DT, DL, DG, EA, EP, GF, GL, GA, GN, HN, JA, LK, LR, ME, ML, MF, MZ, MN, PA, PT, RG, RT, SH, SM, SJ, ST, TL
Erythronium grandiflorum Pursh		Liliaceae	BL, DT, DL, EA, GF, GA, GN, JA, LP, ME, MF, MZ, MN, PT, RB, RT
Eschscholzia californica Chamisso		Papaveraceae
Eucephalus engelmannii (D. C. Eaton) Greene	[Aster engelmannii (D.C. Eaton) A. Gray ex Nuttall]	Asteraceae	EA, GN, JA, ME, PT, RB, RT
Eucephalus glaucus Nuttall	[Aster glaucodes S.F. Blake]	Asteraceae	AA, BL, CF, CC, DT, GF, GA, GN, JA, ME, MF, MZ, MN, OR, PT, RB
Eucephalus perelegans (Nelson & Macbride) W. A. Weber	[Aster perelegans Nelson & Macbride]	Asteraceae	MF
Euclidium syriacum (L.) R. Brown		Brassicaceae	ME, RB
Eupatorium maculatum L. subsp. bruneri (A. Gray) G. W. Douglas		Asteraceae	AH, BL, DG, EP, LR, ME, MN, WL
Euploca convolvulacea Nuttall subsp. californica (Greene) Abrams		Boraginaceae
Euploca convolvulacea Nuttall subsp. convolvulacea	[Heliotropium convolvulaceum (Nuttall) A. Gray]	Boraginaceae	BA, BN, CH, CW, EP, KC, LN, MR, PW, WL, YM
Eustoma grandiflorum (Rafinesque) Shinners		Gentianaceae	AH, BL, CH, FN, JF, KW, LR, LO, MR, OT, SW, WL, YM
Euthamia graminifolia (L.) Nuttall		Asteraceae	AL, RG
Euthamia gymnospermoides Greene		Asteraceae	SW
Euthamia occidentalis Nuttall		Asteraceae	AL, BL, DT, DV, LO, ME, MF, MZ, MN, SW, YM
Eutrema edwardsii R. Brown subsp. penlandii (Rollins) W. A. Weber		Brassicaceae	PA, ST
Evax prolifera Nuttall ex De Candolle		Asteraceae	BA, BL, JF, PW, WL, YM
Evolvulus nuttallianus Schultes		Convolvulaceae	AH, BA, BL, CH, CW, EP, EL, FN, JF, KW, KC, LR, LA, LN, LO, ME, MN, OT, SW, WN, WL, YM
Fagopyrum esculentum Moench		Polygonaceae
Fallopia aubertii (Henry) Holub		Polygonaceae	BL, DV
Fallopia convolvulus (L.) Loeve		Polygonaceae	BL, EP, GL, GA, HF, JF, LA, PT, TL
Fallopia scandens (L.) Holub		Polygonaceae	JF
Fallugia paradoxa (D. Don) Endlicher		Rosaceae	AL, CT, DG, PE
Fendlera falcata Thornber in Woot. & Standl.	[our specimens previously called Fendlera rupicola A. Gray]	Hydrangeaceae	AA, LP, ME, MZ, MN, SM
Fendlera wrightii (Engelmann & A. Gray) Heller	[our specimens previously called Fendlera rupicola A. Gray]	Hydrangeaceae	DT, LP, ME, MZ, MN
Fendlerella utahensis (S. Watson) Heller		Hydrangeaceae	MF, MN
Festuca arizonica Vasey		Poaceae	AL, AA, CC, CN, EP, GA, GN, HN, HF, JA, JF, LA, ML, MZ, MN, OR, PA, SH, ST, TL
Festuca arundinacea Schreber	Lolium arundinaceum	Poaceae	BL, CH, GF, LR, ME, MZ, MN
Festuca baffinensis Polunin		Poaceae	GA, GN, PA, PT, ST
Festuca brachyphylla Schultes subsp. coloradensis Fredriksen		Poaceae	AL, BL, CF, CC, DL, EP, GF, GL, GA, GN, HN, JA, LP, LK, LR, ME, MZ, PA, PT, RT, SH, SM, SJ, ST
Festuca campestris Rydberg		Poaceae
Festuca earlei Rydberg		Poaceae	CC, CN, GA, LR, ME, PA, SJ
Festuca hallii (Vasey) Piper		Poaceae	HF, LR
Festuca idahoensis Elmer		Poaceae	CC, CN, CU, DT, EA, GF, GL, GA, GN, HN, JA, LK, ME, ML, MF, MN, PA, RB, RT, SH, ST
Festuca minutiflora Rydberg		Poaceae	BL, CF, CC, GL, GA, GN, LP, LK, LR, ME, PA, PT, RG, SJ, ST
Festuca ovina L.		Poaceae	LR
Festuca pratensis Hudson		Poaceae	BA, BL, CU, EL, GA, GN, JF, LP, ME, MZ, MN, OT, RB, RT
Festuca rubra L.		Poaceae	BL, DT, DL, EP, GF, GL, GA, GN, LR, ME, ML, MF, RB, RT, SJ, ST
Festuca saximontana Rydberg		Poaceae	AL, BL, CF, CC, CU, DT, EA, EP, GF, GL, GA, GN, HN, JA, JF, LP, LR, ML, MN, PA, PT, RT, SM, SJ, ST
Festuca sororia Piper		Poaceae	ML
Festuca subulata Trinius		Poaceae	RB
Festuca thurberi Vasey in Rothrock		Poaceae	AL, AA, BL, CF, CC, CN, CT, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, LP, ME, ML, MN, PA, RB, RT, SH, SM, SJ, ST, TL
Filipendula ulmaria (L.) Maxim		Rosaceae	BL
Fimbristylis puberula (Michaux) Vail var. interior (Britton) Kral		Cyperaceae	YM
Flaveria campestris J. R. Johnston		Asteraceae	BN, FN, ME, OT, PW
Floerkea proserpinacoides Willdenow		Limnanthaceae	DT, GN, RT
Forestiera pubescens Nuttall		Oleaceae	EP, ME, MZ, MN, SM
Forsellesia meionandra (Koehne) Heller		Crossosomataceae	DT, ME, MF, MZ, MN, RB
Forsellesia planitierum Ensign		Crossosomataceae	LA, PE
Fragaria vesca L. subsp. bracteata (Heller) Staudt		Rosaceae	AA, BL, CN, EP, GN, LA, ML, MN, PA, PE, RT, SH, SM, TL
Fragaria virginiana P. Miller subsp. glauca (S. Watson) Staudt		Rosaceae	AL, BL, CN, DT, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MZ, MN, PA, PT, RG, RT, SH, SM, SJ, ST, TL
Frangula alnus P. Miller		Rhamnaceae	BL, EP
Frankenia jamesii Torrey ex A. Gray		Frankeniaceae	BN, EP, FN, KW, MZ, OT, PE
Frasera albomarginata S. Watson		Gentianaceae	MZ
Frasera coloradensis (C. M. Rogers) D. Post		Gentianaceae	BA, BN, LA, PW
Frasera paniculata Torrey		Gentianaceae	ME
Frasera speciosa Douglas ex Grisebach		Gentianaceae	BL, CC, DL, EA, EP, GF, GL, GA, GN, JA, JF, LR, ME, ML, MZ, MN, PA, PE, RB, RT, SH, SJ, TL
Fraxinus americana L.		Oleaceae
Fraxinus anomala Torrey ex S. Watson		Oleaceae	ME, MF, MZ, MN, SJ, SM
Fraxinus pennsylvanica H. Marshall var. lanceolata (Borkhausen) Sargent		Oleaceae	BL, KC, LN, MR, YM
Fritillaria atropurpurea Nuttall		Liliaceae	DL, EA, GA, GF, ME, MF, MZ, MN, RT, ST
Fritillaria pudica (Pursh) Sprengel		Liliaceae	MF
Froelichia floridana (Nuttall) Moquin var. campestris (Small) Fernald		Amaranthaceae	BA, KC, PL, SW
Froelichia gracilis (Hooker) Moquin		Amaranthaceae	BA, BL, CH, DG, EP, EL, JF, LA, LN, LO, WN
Fumaria vaillantii Loiseleur		Fumariaceae	JF, LR, LA
Gaillardia aristata Pursh		Asteraceae	BL, CC, CT, CU, EA, EP, GL, GA, GN, HF, JF, LR, LA, MF, RB, RT
Gaillardia pinnatifida Torrey		Asteraceae	BA, CW, DT, EP, FN, HF, LP, LA, LN, ME, MF, MZ, MN, OT, PE, SM
Gaillardia pulchella Fougeroux		Asteraceae	BA, BN, PW
Gaillardia spathulata A. Gray		Asteraceae	ME
Galeopsis bifida Bonningshausen		Lamiaceae	GN, JF, PT, ST
Galinsoga parviflora Cavanilles		Asteraceae	BL, DV, EP, PE
Galinsoga quadriradiata Ruiz & Pavon		Asteraceae	BL, JF
Galium aparine L.		Rubiaceae	BL, DG, GF, JF, LA
Galium bifolium S. Watson		Rubiaceae	DT, EA, GA, GN, LR, ME, MF, MN, RB, RT, ST
Galium coloradoense W. F. Wight		Rubiaceae	GF, GN, ME, MF, MZ, MN, RB
Galium mexicanum Humboldt, Bonpland, & Kunth subsp. asperrimum (A. Gray) Dempster		Rubiaceae	EP, LR, ME, MN, RB
Galium odoratum (L.) Scopoli		Rubiaceae	DV
Galium pilosum Ait.		Rubiaceae	PE
Galium septentrionale Roemer & Schultes	[Galium boreale L.]	Rubiaceae	AL, AA, BL, CN, CT, CU, DT, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LR, LA, ME, ML, MF, MZ, MN, OR, PA, PT, PE, RB, RT, SM, ST, TL
Galium spurium L.		Rubiaceae	BL, DT, DV, DG, GF, JF, LR, LA, MZ, MN, SM
Galium trifidum L. subsp. subbiflorum (Wiegand) Puff		Rubiaceae	AA, BL, CN, CU, EA, GF, GL, GA, GN, JA, LR, ME, ML, MN, MZ, PA, PT, RT, SH, SJ, TL
Galium triflorum Michaux		Rubiaceae	AA, BL, CU, DT, DL, DG, EP, GF, GL, GA, GN, HF, JA, JF, LP, LR, LA, ME, MF, OR, PT, RB, RT, SM, ST, TL
Galium verum L.		Rubiaceae	BL, GN, RT
Gastrolychnis apetala (L.) Tolmatchev & Kozhanchikov subsp. uralensis (Ruprecht) Loeve & Loeve	[Lychnis apetala L.]	Caryophyllaceae	GN, PT
Gastrolychnis drummondii (Hooker) Loeve & Loeve	[Lychnis drummondii (Hooker) S. Watson]	Caryophyllaceae	AL, BL, CC, CT, CU, DL, DG, EP, GF, GL, GA, GN, JF, LR, LA, ME, MF, MZ, MN, PA, PT, RG, RT, SH, SM, SJ, TL
Gastrolychnis kingii (S. Watson) W. A. Weber	[Lychnis kingii S. Watson]	Caryophyllaceae
Gaultheria humifusa (R. Graham) Rydberg		Ericaceae	BL, GA, GN, JA, LP, LR, PT, RT, SJ, ST
Gaura coccinea Nuttall ex Pursh		Onagraceae	AL, BA, BN, BL, CF, CH, CC, CN, CW, CU, DV, DG, EP, GN, HF, JF, KW, KC, LR, LA, LN, LO, ML, MZ, OT, PW, PE, RG, SH, SM, SW, TL, WL, YM
Gaura mollis James	[Gaura parviflora Douglas ex Lehmann]	Onagraceae	AH, BA, BL, CH, EP, EL, JF, KW, KC, LP, LA, LN, LO, ME, MZ, MN, MR, OT, SW, WL, YM
Gaura neomexicana Wooton		Onagraceae	AA, BL, LP, WL
Gaura neomexicana Wooton subsp. coloradensis (Rydberg) Raven & Gregory		Onagraceae	BL, WL
Gaura neomexicana Wooton subsp. neomexicana		Onagraceae	AA
Gaura villosa Torrey		Onagraceae	BA
Gayophytum decipiens Lewis & Szweykowski		Onagraceae	GF, MN
Gayophytum diffusum Torrey & Gray subsp. parviflorum Lewis & Szweykowski		Onagraceae	BL, CC, DT, DL, EP, GL, GA, GN, HF, JA, JF, LP, ME, MF, MZ, MN, PA, RB, RT, SH
Gayophytum racemosum Torrey & Gray		Onagraceae	BL, CC, ME, MF
Gayophytum ramosissimum Torrey & Gray		Onagraceae	AA, CF, CN, EP, GA, GN, LP, LR, ML, MZ, OR, RB, RT
Gentianella acuta (Michaux) Hiitonen		Gentianaceae	AL, BL, CF, CC, CU, DT, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LK, LR, ME, ML, PA, PT, RB, RG, RT, SH, SJ, ST, TL
Gentianella heterosepala (Engelmann) Holub		Gentianaceae	AA, BL, CC, DT, DL, GN, HN, LP, ME, ML, MZ, MN, OR, PA, PT, RB, SM, SJ
Gentianella strictiflora (Rydberg) W. A. Weber		Gentianaceae	AL, BL, CN, CT, EP, GL, LR, LA, ML, MZ, PA, RG
Gentianella tortuosa (Jones) J. M. Gillett		Gentianaceae	RB
Gentianodes algida (Pallas) Loeve & Loeve	[Gentiana algida Pallas]	Gentianaceae	AL, BL, CF, CC, CT, CU, DG, EA, EP, GF, GL, GA, GN, LP, LK, LR, OR, PA, PT, RG, SH, SM, SJ, ST
Gentianopsis barbellata (Engelmann) Iltis	[Gentiana barbellata Engelmann]	Gentianaceae	AL, CF, CC, CU, GN, GL, HF, LK, LR, ML, PA, PT, SH, SM, SJ, ST
Gentianopsis procera (Holm) Iltis		Gentianaceae	EP
Gentianopsis thermalis (Kuntze) Iltis	[Gentiana thermalis Kuntze]	Gentianaceae	BL, CF, CN, CT, CU, DT, DL, EA, EP, GF, GA, GN, HN, JA, LP, LK, LR, ME, ML, MZ, PA, PT, RG, RT, SH, SM, SJ, ST
Geranium bicknellii Britton var. longipes (S. Watson) Fernald		Geraniaceae	GA, JF, RT
Geranium caespitosum James ex Torrey		Geraniaceae	AA, BL, CF, CC, CN, CT, CU, DG, EP, GL, GN, HN, HF, JF, LP, LK, LR, LA, ME, ML, MZ, OR, PA, PE, RB, RG, SH, SM, ST, TL, WL
Geranium caespitosum James ex Torrey subsp. atropurpureum (Heller) W. A. Weber		Geraniaceae
Geranium caespitosum James ex Torrey subsp. caespitosum		Geraniaceae
Geranium columbinum L.		Geraniaceae	BL
Geranium ibericum Cav.		Geraniaceae	BL
Geranium richardsonii Fischer & Trautvetter		Geraniaceae	AA, BL, CC, CN, CT, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SM, SJ, TL
Geranium viscosissimum Fischer & Meyer subsp. nervosum (Rydberg) W. A. Weber		Geraniaceae	AA, DT, GF, GA, GN, JA, ME, MF, PT, RB, RT, ST
Geum aleppicum Jacquin subsp. strictum (Aiton) Clausen		Rosaceae	BL, EP, GF, GL, GN, HF, JF, ML, SH
Geum macrophyllum Willdenow		Rosaceae	AA, BL, CF, CC, CN, CT, CU, DT, DL, DG, EA, GF, GL, GA, GN, HF, JA, JF, LR, LA, ME, ML, MF, MZ, PA, PT, RB, RT, SH, SM, SJ, ST, TL
Geum rivale L.		Rosaceae	BL, CT, EA, EP, GL, GA, GN, JA, LR, LA, ML, PA, SJ, ST
Gilia clokeyi Mason		Polemoniaceae	ME, MN
Gilia haydenii A. Gray		Polemoniaceae	DL, LP, ME, MZ, MN
Gilia inconspicua (J. E. Smith) Douglas		Polemoniaceae
Gilia micromeria A. Gray		Polemoniaceae
Gilia ophthalmoides Brand		Polemoniaceae	AA, BL, DT, DG, EP, GF, GN, JF, LP, LR, LA, ME, MF, MZ, MN, OT, RB, SM
Gilia pentstemonoides Jones		Polemoniaceae	GN, MN
Gilia pinnatifida Nuttall		Polemoniaceae	AL, BL, CF, CH, CC, CN, DV, DG, EP, GN, HF, JA, LR, LN, ML, MF, MR, OR, PA, RG, SH, TL, WL
Gilia sinistra Jones		Polemoniaceae	RT
Gilia sinuata Douglas ex Bentham		Polemoniaceae	ME, SM
Gilia stenothyrsa A. Gray		Polemoniaceae	RB
Gilia subnuda Torrey		Polemoniaceae
Gilia tricolor Bentham		Polemoniaceae	BL
Gilia triodon Eastwood		Polemoniaceae	MF
Gilia tweedyi Rydberg		Polemoniaceae	MF
Giliastrum rigidulum (Bentham) Rydberg subsp. acerosum (A. Gray) W. A. Weber		Polemoniaceae	BA, BN, LA, OT
Glandularia bipinnatifida (Nuttall) Nuttall		Verbenaceae	AH, AA, BA, BL, DV, EP, FN, HF, JF, LP, LA, OT, PE
Glaucium corniculatum (L.) Rudolph		Papaveraceae	BL
Glaucium flavum Crantz		Papaveraceae	BL
Glaux maritima L. var. angustifolia Boivin		Primulaceae	AL, CT, DV, ME, MF, MN, PA, WL
Glecoma hederacea L.		Lamiaceae	BL, LP
Gleditsia triacanthos L.		Fabaceae	BA, BL, KC
Glyceria borealis (Nash) Batchelder		Poaceae	BL, GL, GA, GN, JA, LR, PT, RB, RT
Glyceria elata (Nash ex Rydberg) Jones		Poaceae	BL, GA, GN, JA, JF, LR, MF, PT, RB, RT, SM, ST, TL
Glyceria grandis S. Watson in A. Gray		Poaceae	AL, BL, CU, DT, DG, EP, GF, GL, GN, JF, ML, MF, PA, PT, RB, RG, RT, SH, TL
Glyceria striata (Lamarck) A. S. Hitchcock var. stricta (Scribner) Fernald		Poaceae	AA, BA, BL, CC, CN, CU, DT, DL, EA, GF, GL, GA, GN, JF, LP, LR, ME, ML, MF, MZ, MN, PT, RB, RG, RT, SH, ST, TL, WL
Glycyrrhiza lepidota Pursh		Fabaceae	AL, AA, BA, BL, CH, CU, DT, EA, EP, EL, GF, GA, GN, JF, KW, KC, LP, LR, LA, LN, LO, ME, ML, MF, MZ, MN, PT, PE, SH, WL, YM
Gnaphalium palustre Nuttall		Asteraceae	AM, BL, LR, MF, RT, WL
Gnaphalium uliginosum L.		Asteraceae	AL, BL, CC, CN, DT, DL, GL, GA, GN, JA, JF, LR, ME, ML, MF, MZ, MN, PA, RG, RT, TL, WL
Goodyera oblongifolia Rafinesque		Orchidaceae	BL, CU, DG, DL, EA, HF, JF, LP, LR, LA, ML, MZ, OR, PT, PE, RB, RT, SJ, ST
Goodyera repens (L.) R. Brown		Orchidaceae	AA, CC, CU, EP, JF, LP, LA, ML, ST, TL
Grammica campestris (Yuncker) Hadac & Chrtek		Cuscutaceae	KC, MZ
Grammica cuspidata (Engelmann) Hadac & Chrtek	[Cuscuta cuspidata Engelmann]	Cuscutaceae	BA, CH, LA, LN
Grammica denticulata (Engelmann in Parry) W. A. Weber		Cuscutaceae	MZ
Grammica indecora (Choisy) W. A. Weber var. neuropetala (Engelmann) W. A. Weber	[Cuscuta indecora Choisy]	Cuscutaceae	AH, BA, BN, BL, CH, DV, EP, LP, LA, LN, ME, MZ, OT, PL, PE, SW, WN, WL
Grammica occidentalis (Millspaugh) Hadac & Chrtek		Cuscutaceae	MZ
Grammica umbellata (Humboldt, Bonpland, & Kunth) Hadac & Chrtek		Cuscutaceae	DT, KC, PW
Grammica umbrosa (Hooker) W. A. Weber		Cuscutaceae
Gratiola neglecta Torrey		Scrophulariaceae	AL, BL, DG, EP, JF, MN, RT
Grindelia aphanactis Rydberg		Asteraceae	AL, HF, MZ
Grindelia arizonica A. Gray var. stenophylla Steyermark		Asteraceae	AA, LP, MZ
Grindelia decumbens Greene		Asteraceae	AL, CN, LA, ML, RG, SM
Grindelia decumbens Greene var. decumbens		Asteraceae
Grindelia decumbens Greene var. subincisa (Greene) Steyermark		Asteraceae
Grindelia fastigiata Greene		Asteraceae	DT, ME, MF, MN, RB
Grindelia inornata Greene		Asteraceae	BA, DV, FN, LA, OT, PW, PE
Grindelia revoluta Steyermark		Asteraceae	EP
Grindelia squarrosa (Pursh) Dunal		Asteraceae	BA, BL, CH, CN, DT, DV, EP, GF, GL, GN, HF, JF, KW, KC, LR, LA, LN, LO, ME, MF, MZ, MN, PT, PE, RT, SW, WL, YM
Grindelia squarrosa (Pursh) Dunal var. nuda (Wood) A. Gray		Asteraceae
Grindelia squarrosa (Pursh) Dunal var. quasiperennis Lunell		Asteraceae
Grindelia squarrosa (Pursh) Dunal var. serrulata (Rydberg) Steyermark		Asteraceae
Grindelia subalpina Greene		Asteraceae	BL, CC, DG, EP, GL, JA, JF, LR, TL
Grossheimia macrocephala (Muss.-Pusch.) Sosnowsky & Takhtajan		Asteraceae	BL
Guilleminea densa (Willdenow ex Roemer & Schultes) Moquin		Amaranthaceae	BA
Gutierrezia microcephala (De Candolle) A. Gray		Asteraceae	MZ, MN
Gutierrezia sarothrae (Pursh) Britton & Rusby		Asteraceae	AL, AH, AA, BA, BN, BL, CF, CH, CT, CU, DT, DL, EA, EP, FN, GN, HF, JF, KW, KC, LP, LR, LA, LN, LO, ME, MF, MZ, MN, MR, PA, PE, RB, RG, RT, SH, SW, TL, WL, YM
Gymnocarpium dryopteris (L.) Newman		Dryopteridaceae	AA, BL, CT, EP, GL, GA, GN, JA, LP, LR, ML, PA, PT, RT, ST
Gymnocarpium x brittonianum (Sarvela) Pryer & Haufler		Dryopteridaceae
Gymnosteris parvula Heller		Polemoniaceae	GA, GN, LR, ME, ST
Gypsophila elegans Bieberstein		Caryophyllaceae	BL, EP, MF
Gypsophila paniculata L.		Caryophyllaceae	BL, EP, GA, JF, ME, MF
Gypsophila scorzonerifolia Seringe in De Candolle		Caryophyllaceae	BL
Hackelia besseyi (Rydberg) J. L. Gentry		Boraginaceae
Hackelia floribunda (Lehmann) I. M. Johnston		Boraginaceae	BL, CF, CC, CN, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LR, LA, ME, ML, MF, MN, PA, RB, RT, SH, ST, TL
Hackelia gracilenta (Eastwood) I. M. Johnston		Boraginaceae	MZ
Hackelia micrantha (Eastwood) J. L. Gentry		Boraginaceae	GF, RB
Halerpestes cymbalaria (Pursh) Greene subsp. saximontana (Fernald) Moldenke	[Ranunculus cymbalaria Pursh var. saximontanus Fernald]	Ranunculaceae	AL, AH, AA, BA, BL, CH, CT, CW, CU, DT, DV, EP, FN, GF, GN, HF, JA, JF, LP, LR, LA, LN, ME, ML, MF, MZ, MN, PA, PW, PE, RB, RG, RT, SH, SW, TL, WL
Halimolobos virgata (Nuttall) O. E. Schulz		Brassicaceae	PA
Halogeton glomeratus (Bieberstein) C. A. Meyer		Chenopodiaceae	EA, GF, ME, MF, MN, PE, RB, SH
Harbouria trachypleura (A. Gray) Coulter & Rose		Apiaceae	BA, BL, EP, GL, JF, LR, LA
Hecatonia scelerata (L.) Fourreau	[Ranunculus sceleratus L.]	Ranunculaceae	AM, AA, BA, BL, CU, DV, DG, EP, GN, JF, KW, KC, LR, LA, ME, ML, MF, MN, MR, PA, PW, RB, RT, SH, WL
Hedeoma drummondii Bentham		Lamiaceae	AA, BA, BN, EP, LR, LA, LO, MZ, MN, RB, SM, WL, YM
Hedeoma hispidum Pursh		Lamiaceae	BL, EP, EL, JF, KC, LR, WL, YM
Hedyotis nigricans (Lamarck) Fosberg		Rubiaceae	YM
Hedysarum boreale Nuttall		Fabaceae	BN, BL, DL, EA, FN, HN, LP, LA, ME, MF, MZ, MN, OT, RB, RT, SM
Hedysarum occidentale Greene		Fabaceae	AA, CN, GN, HN, LP, ME, ML, PA, RG, SH, SJ
Helenium autumnale L. var. montanum (Nuttall) Fernald		Asteraceae	BL, EP, GA, MF, YM
Helenium microcephalum De Candolle		Asteraceae	LA
Helianthella microcephala (A. Gray) A. Gray		Asteraceae	DL, LP, MN
Helianthella parryi A. Gray		Asteraceae	CN, CT, DG, EP, ML, RG, SH, SJ, TL
Helianthella quinquenervis (Hooker) A. Gray		Asteraceae	BL, CT, CU, DG, DL, EA, GF, GL, GN, HF, JA, LP, ME, MN, MZ, PA, PT, RB, RT, SH, SM, SJ, ST
Helianthella uniflora (Nuttall) Torrey & Gray		Asteraceae	GF, JA, MF, RB, RT
Helianthus annuus L.		Asteraceae	AL, BA, BN, BL, CH, CT, EA, EP, EL, FN, GF, JF, KC, LP, LR, LA, LN, LO, ME, ML, MF, MZ, MN, OT, SH, SW, TL, WL
Helianthus ciliaris De Candolle		Asteraceae	JF, MZ
Helianthus maximilianii Schrader		Asteraceae	CC, JF, PW, SW, YM
Helianthus nuttallii Torrey & Gray		Asteraceae	BL, CC, CT, CU, DT, DV, EA, EP, FN, JF, LR, LA, ME, MF, MZ, PE, RB, RG, SH
Helianthus petiolaris Nuttall		Asteraceae	AL, BA, BL, CF, CH, CC, CW, EP, EL, GN, JA, JF, KC, LA, LN, LO, ME, MF, MZ, SH, TL, WN, WL, YM
Helianthus pumilus Nuttall		Asteraceae	AH, BL, CU, DV, DG, EP, FN, JF, LR, WL
Helianthus rigidus (Cassini) Desfontaines subsp. subrhomboideus (Rydberg) Heiser		Asteraceae	AA, BL, EP, HF, JF, LP, MZ, PE
Helianthus tuberosus L.		Asteraceae	CW, LA, ME
Helictotrichon mortonianum (Scribner) Henrard		Poaceae	AA, BL, CC, GL, GA, GN, LR, PA, PT, ST
Heliomeris multiflora Nuttall	[Viguiera multiflora (Nuttall) S.F. Blake]	Asteraceae	AA, AH, BL, CF, CT, CU, DT, DL, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LA, ME, MF, MZ, MN, PT, RB, RG, RT, SJ, SH, SM
Heliopsis helianthoides (L.) Sweet var. scabra (Dunal) Fernald		Asteraceae	HF, EP, LA
Heliotropium curassavicum L. subsp. oculatum (Heller) Thorne		Boraginaceae	AL, AH, BN, DV, KW, MF, SW
Hemicarpha micrantha Pax var. aristulata Coville		Cyperaceae	BL
Heracleum sphondylium L. subsp. montanum (Schleicher ex Gaudin) Briquet in Schinz & Thellung	[Heracleum lanatum Michaux]	Apiaceae	AL, BL, CU, DV, EA, EP, GF, GL, GA, GN, HF, JF, LP, LR, LA, ME, MN, PA, PT, PE, RB, RT, SH, SM, SJ, TL
Herrickia horrida Wooton & Standley		Asteraceae	LA
Hesperis matronalis L.		Brassicaceae	BL, GN, JF, LR
Hesperochiron pumilus (Douglas) T. C. Porter		Hydrophyllaceae
Hesperostipa comata (Trinius & Ruprecht) Barkworth	[Stipa comata Trinius & Ruprecht]	Poaceae	AH, AA, BN, BL, CF, CH, CC, CN, CU, DT, DV, DG, EA, EP, EL, FN, GF, GL, GA, GN, JF, KW, KC, LR, LA, LN, LO, ME, ML, MF, MZ, MN, MR, PA, PE, RB, RT, SH, SM, SW, ST, WN, WL, YM
Hesperostipa neomexicana (Thurber) Barkworth	[Stipa neomexicana (Thurber ex Coulter) Scribner]	Poaceae	BL, CN, EP, FN, JF, LA, ME, MZ, MN, OT, PE, RG
Hesperostipa spartea (Trinius) Barkworth	[Stipa spartea Trinius]	Poaceae	BL, DG, EP, JF, LR
Heteranthera limosa (Swartz) Willdenow		Pontederiaceae	DV, LA, WL
Heterocodon rariflorus Nuttall		Campanulaceae	RT
Heterosperma pinnatum Cavanilles		Asteraceae	LA
Heterotheca canescens (De Candolle) Shinners		Asteraceae	AH, BA, LA, LN, LO, OT, PL, SW, WN, WL, YM
Heterotheca foliosa (Nuttall) Shinners		Asteraceae	BL, CC, EP, GL, JF, LK, LR, PA, RT, TL
Heterotheca fulcrata (Greene) Shinners (see H. foliosa)		Asteraceae
Heterotheca latifolia Buckley		Asteraceae	BA, KC
Heterotheca pumila (Greene) Semple		Asteraceae	AL, BL, CF, CC, DG, EA, GL, GA, GN, HF, LP, LK, LR, ML, MN, PA, PT, SH, SJ, ST, TL
Heterotheca villosa (Pursh) Shinners		Asteraceae	AH, AA, BA, BL, CF, CH, CC, CN, CT, CU, DT, DL, DG, EA, EP, EL, GF, GL, GA, GN, HF, JA, JF, KW, KC, LP, LR, LA, LN, LO, ME, ML, MF, MZ, MN, OT, OR, RB, RG, RT, SH, SJ, SM, SW, ST, TL, WL, YM
Heterotheca villosa (Pursh) Shinners var. hispida (Hooker) V. Harms		Asteraceae
Heterotheca villosa (Pursh) Shinners var. pedunculata (Greene) V. Harms ex Semple		Asteraceae
Heterotheca villosa (Pursh) Shinners var. villosa		Asteraceae
Heuchera bracteata (Torrey) Seringe		Saxifragaceae	BL, CC, EP, GL, GA, JF, LR, RB
Heuchera hallii A. Gray		Saxifragaceae	CF, CU, DG, EP, JF, PA
Heuchera parvifolia Nuttall ex Torrey & Gray		Saxifragaceae	AL, AA, BL, CF, CC, CU, DT, DL, DG, EA, EP, FN, GF, GL, GA, GN, HN, HF, JF, LP, LR, LA, ME, ML, MF, MZ, MN, PA, RB, RG, RT, SH, SM, SJ, ST, TL,
Heuchera parvifolia Nuttall ex Torrey & Gray var. nivalis (Rosendahl) Loeve et al.		Saxifragaceae
Heuchera parvifolia Nuttall ex Torrey & Gray var. parvifolia		Saxifragaceae
Heuchera richardsonii R. Brown		Saxifragaceae	DG, EP
Heuchera rubescens Torrey in Stansbury		Saxifragaceae	ME
Heuchera versicolor Greene		Saxifragaceae	LA
Hibiscus trionum L.		Malvaceae	AM, BL, FN, ME, OT, WL
Hieracium aurantiacum L.		Asteraceae	BL, EA, JF, LR, PT
Hierochloe hirta (Schrank) Borbas subsp. arctica (J. Presl in K. Presl) G. Weimarck		Poaceae	AL, AA, BL, CC, CU, GF, GL, GA, GN, HF, JA, LK, LR, ME, ML, PA, RT, SH, SJ, ST, TL
Hilaria jamesii (Torrey) Bentham		Poaceae	AA, BN, CH, CW, DT, EA, GF, GN, KW, LP, LA, LN, ME, MF, MZ, MN, OT, PW, PE, RB
Hippochaete hyemalis (L.) Bruhin	[Equisetum hyemale L.]	Equisetaceae	BL, CW, DT, DG, EA, EP, GF, GL, GA, GN, HF, LO, ME, ML, MF, MZ, MN, OR, PA, RB, RT, ST
Hippochaete laevigata (A. Braun) Farwell	[Equisetum laevigatum A. Braun]	Equisetaceae	AL, BA, BL, CN, CT, CU, DL, EP, FN, GF, GA, GN, HF, JF, KC, LP, LK, LR, LA, LN, ME, ML, MF, MZ, MN, PA, PW, PE, RB, RT, SH, SM, TL, WL, YM
Hippochaete variegata (Schleicher) Bruhin	[Equisetum variegatum Schleicher]	Equisetaceae	DL, GA, GN, JF, PA, RT, ST, WL, YM
Hippuris vulgaris L.		Hippuridaceae	BL, CC, GN, EP, HN, JA, LP, LR, PA, RB, ST
Hirculus platysepalus (Trautvetter) W. A. Weber subsp. crandallii (Gandoger) W. A. Weber	[Saxifraga platysepala Trautv. subsp. crandallii (Gand.) Tolm.]	Saxifragaceae	AL, BL, CF, CC, CN, CU, EP, GL, GA, GN, HF, LP, LK, LR, MZ, PA, PT, SH, SJ, ST
Hirculus prorepens (Fischer ex Sternberg) Loeve & Loeve	[Saxifraga hirculus L.]	Saxifragaceae	BL, CC, EP, LK, PA
Hirculus serpyllifolius (Pursh) W. A. Weber subsp. chrysanthus (A. Gray) W. A. Weber	[Saxifraga chrysantha A. Gray]	Saxifragaceae	AL, BL, CF, CC, CU, EP, GL, GA, GN, LK, LR, ML, PA, SH, SJ, ST
Hoffmanseggia drepanocarpa A. Gray		Fabaceae	BA, FN, LA, OT, PE
Hoffmanseggia glauca (Ortega) Eifert		Fabaceae	AL, BA, LA, OT
Holcus lanatus L.		Poaceae	BL, ME
Holodiscus dumosus (Nuttall ex Hooker) Heller		Rosaceae	AL, BL, CF, CC, CN, CU, DT, DL, EA, EP, GF, GA, GN, HN, HF, JF, LR, LA, ME, ML, MF, MZ, MN, OR, PT, PE, RB, RG, RT, SH, ST
Holosteum umbellatum L.		Alsinaceae	BL, JF, ME
Hordeum vulgare L.		Poaceae	AM, BL, GL, JF
Hordeum vulgare L. var. trifurcatum (Schlechtendal) Alefeld		Poaceae
Hordeum vulgare L. var. vulgare		Poaceae
Humulus lupulus L. subsp. americanus (Nuttall) Loeve & Loeve		Cannabaceae	AH, AA, BL, CC, CT, DG, GF, GA, GN, JF, LP, LR, ME, ML, MF, MZ, MN, PT, PE, RB, RG, RT, SH, TL
Huperzia haleakalae (Brackenridge) Holub		Lycopodiaceae	BL, CC, GA, GN, LR, RT, SJ, ST
Hybanthus verticillatus (Ortega) Baillon		Violaceae	BA, BL, FN, JF, LA, OT, PW, PE
Hydrophyllum capitatum Douglas ex Bentham		Hydrophyllaceae	DT, EA, GF, GA, GN, ME, MN, RT
Hydrophyllum fendleri (A. Gray) Heller		Hydrophyllaceae	AA, BL, CN, CT, CU, DT, DL, GA, GF, GL, GN, HF, JF, LP, LR, LA, ME, MZ, MN, PE, RB, RG, SH
Hymenolobus procumbens (L.) Nuttall ex Torrey & Gray		Brassicaceae	GA, GN, SH
Hymenopappus filifolius Hooker		Asteraceae	AL, AA, BL, CF, CH, CU, DT, DL, DG, EA, EP, EL, GF, GA, GN, HF, JF, LP, LR, LA, ME, ML, MF, MZ, MN, OT, PA, RB, SH, SM, SW, WN, WL, YM
Hymenopappus filifolius Hooker var. cinereus (Rydberg) I. M. Johnston		Asteraceae	AL, AA, BL, CF, CU, DT, DG, EA, EP, EL, GF, GA, GN, HF, JF, LR, LA, ME, MZ, MN, OT, PA, SH, SM, SW, WL, YM
Hymenopappus filifolius Hooker var. luteus (Nuttall) B. Turner		Asteraceae	MF, MN, RB, SM
Hymenopappus filifolius Hooker var. megacephalus B. Turner		Asteraceae	AA, GA, ME, MZ, MN, RB, SM
Hymenopappus filifolius Hooker var. parvulus (Greene) B. Turner		Asteraceae	CU, DL, GN, LP, LA, ML, MZ, WL
Hymenopappus filifolius Hooker var. pauciflorus (I. M. Johnston) B. Turner		Asteraceae
Hymenopappus filifolius Hooker var. polycephalus (Osterhout) B. Turner		Asteraceae	WN, WL
Hymenopappus flavescens A. Gray		Asteraceae	BA, KC, LN, YM
Hymenopappus newberryi (A. Gray) I. M. Johnston		Asteraceae	AA, HN, ML, MZ, SH, TL
Hymenopappus tenuifolius Pursh		Asteraceae	BA, EP, EL, KW, KC, LA, LN, LO, PL, PE, SW, WL, YM
Hyoscyamus niger L.		Solanaceae	BL, GA, GN, MF, OR, PA, SH
Hypericum formosum Humboldt, Bonpland, & Kunth		Hypericaceae	AA, BL, CT, CU, DT, EP, GL, GA, GN, JF, LP, LR, LA, ME, MF, MN, RT, SM, TL
Hypericum majus (A. Gray) Britton		Hypericaceae	BL, EP, JF
Hypericum perforatum L.		Hypericaceae	BL, EA, JF, LR, PT
Hypochaeris radicata L.		Asteraceae	BL
Hypopitys monotropa Crantz	[Monotropa hypopitys L. var. latisquama (Rydb.) Kearn. & Peeb.]	Monotropaceae	BL, DG, FN, JA, LR, LA, ML, RT
Hypoxis hirsuta (L.) Coville		Hypoxidaceae	CU, LA
Hyssopus officinalis L.		Lamiaceae	BL
Iberis amara L.		Brassicaceae	AH
Iliamna crandallii (Rydberg) Wiggins	[Iliamna grandiflora (Rydb.) Wiggins subsp. crandallii (Rydb.) Slotta comb. nov.]	Malvaceae	GF, RB, RT
Iliamna grandiflora (Rydberg) Wiggins	[Iliamna grandiflora (Rydberg) Wiggins subsp. grandiflora]	Malvaceae	ME, MZ, PT
Iliamna rivularis (Douglas) Greene		Malvaceae	MF
Impatiens capensis Meerburgh		Balsaminaceae	AH, BL, DG, GF, PE
Ipomoea leptophylla Torrey		Convolvulaceae	AH, BA, BN, CH, CW, EP, KW, KC, LA, LN, LO, PL, SW, WN, WL, YM
Ipomoea purpurea L.		Convolvulaceae	DV, JF
Ipomopsis aggregata (Pursh) V. Grant	[Gilia aggregata (Pursh) Sprengel]	Polemoniaceae	AL, AH, AA, BL, CF, CC, CN, CT, CU, DT, DV, DL, DG, EA, EP, EL, FN, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, MR, OR, PA, RB, RG, RT, SH, SM, SJ, ST, TL
Ipomopsis aggregata (Pursh) V. Grant subsp. aggregata	[Gilia aggregata (Pursh) Sprengel]	Polemoniaceae	AA, DT, DL, EA, GF, GA, GN, LP, ME, MF, MZ, MN, OR, RB, RT, SM, SJ, ST
Ipomopsis aggregata (Pursh) V. Grant subsp. attenuata (A. Gray) V. & A. Grant	[Gilia attenuata (A. Gray) A. Nelson]	Polemoniaceae	GF, GA, GN, JA, ME, RB, RT
Ipomopsis aggregata (Pursh) V. Grant subsp. candida (Rydberg) V. & A. Grant	[Gilia candida Rydberg]	Polemoniaceae	AL, AH, BL, CC, CN, CT, DG, EP, EL, FN, GL, JF, LA, ML, MR, PA, RG, SH, TL
Ipomopsis aggregata (Pursh) V. Grant subsp. collina (Greene) Wilken & Allard	[Gilia candida Rydberg subsp. collina (Greene) Wherry]	Polemoniaceae	AL, BL, CF, CN, CT, DV, DG, GL, GA, HF, JF, LK, LR, LA, ML, PA, SH, TL
Ipomopsis aggregata (Pursh) V. Grant subsp. formosissima (Greene) Wherry		Polemoniaceae
Ipomopsis aggregata (Pursh) V. Grant subsp. weberi Grant & Wilken	[Gilia arizonica (Greene) Rydberg]	Polemoniaceae	GA, JA, RT
Ipomopsis congesta (Hooker) V. Grant	[Gilia congesta Hooker]	Polemoniaceae	AA, DT, EA, HN, JA, ME, MF, MZ, MN, PA, RB, SM, WL
Ipomopsis congesta (Hooker) V. Grant subsp. congesta	[Gilia congesta Hooker]	Polemoniaceae
Ipomopsis congesta (Hooker) V. Grant subsp. crebrifolia (Rydberg) Day		Polemoniaceae
Ipomopsis congesta (Hooker) V. Grant subsp. frutescens (Rydberg) Day		Polemoniaceae
Ipomopsis globularis (Brand) W. A. Weber	[Gilia globularis Brand]	Polemoniaceae	LK, PA, ST
Ipomopsis gunnisonii (Torrey & Gray) V. Grant	[Gilia gunnisonii Torrey & Gray]	Polemoniaceae	MZ
Ipomopsis laxiflora (Coulter) V. Grant	[Gilia laxiflora (Coulter) Osterhout]	Polemoniaceae	BA, BL, DV, EP, EL, FN, KW, LA, LN, OT, WL
Ipomopsis longiflora (Torrey) V. Grant	[Gilia longiflora (Torrey) G. Don]	Polemoniaceae	AL, BA, CH, EP, FN, KC, LP, LN, LO, MZ, MN, PL, RG, SH, WN, WL
Ipomopsis multiflora (Nuttall) V. Grant		Polemoniaceae	CN
Ipomopsis polyantha (Rydberg) V. Grant	[Gilia polyantha Rydberg]	Polemoniaceae	AA
Ipomopsis polycladon Torrey	[Gilia polycladon Torrey]	Polemoniaceae	DT, ME, MF, MZ, MN, RB
Ipomopsis pumila (Nuttall) V. Grant	[Gilia pumila Nuttall]	Polemoniaceae	DL, ME, MF, MZ, MN, OT, PE, SM
Ipomopsis roseata (Rydberg) V. Grant	[Gilia roseata Rydberg]	Polemoniaceae	ME
Ipomopsis spicata (Nuttall) V. Grant	[Gilia spicata Nuttall]	Polemoniaceae	BL, EL, FN, JF, KC, LR, LA, LN, MF, PE, WL, YM
Ipomopsis tenuituba (Rydberg) V. Grant	[Gilia tenuituba Rydberg]	Polemoniaceae	GN, ME, MN, RT
Iris missouriensis Nuttall		Iridaceae	AL, BL, CN, CU, DT, EP, GF, GA, GN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, PA, PT, RG, SJ, SM, ST, TL
Isatis tinctoria L.		Brassicaceae	BL, GA, JA
Isocoma drummondii (Torrey & Gray) Greene		Asteraceae	MZ
Isocoma pluriflora (Torrey & Gray) Greene		Asteraceae
Isoetes bolanderi Engelmann		Isoetaceae	AA, BL, GF, GA, GN, HN, JA, LR, ME
Isoetes lacustris L.		Isoetaceae	LR
Isoetes setacea Lamarck subsp. muricata (Durieu) Holub		Isoetaceae	LR
Iva axillaris Pursh		Asteraceae	AM, AL, BL, CH, CN, DT, EP, FN, GN, JF, KW, LR, LN, ME, MF, MZ, MN, OT, PE, RB, WL
Ivesia gordonii (Hooker) Torrey & Gray		Rosaceae	AL, EA, GA, GF, GN, JA, LP, LK, MF, PA, RT
Jacea pratensis Lamarck		Asteraceae	BL
Jamesia americana Torrey & Gray		Hydrangeaceae	AL, BL, CF, CC, CN, CU, DG, EP, GL, HF, JF, LR, LA, PA, SH, TL
Juncus acuminatus Michaux		Juncaceae	BL
Juncus albescens (J. Lange) Fernald		Juncaceae	BL, CF, CC, GN, LP, LR, PA, PT, SJ, ST
Juncus alpino-articulatus Chaix in Villars	[Juncus alpinus Villars]	Juncaceae	AA, BL, CU, DG, EP, GN, PA
Juncus arcticus Willdenow subsp. ater (Rydberg) Hulten	[Juncus ater Rydberg]	Juncaceae	AM, AL, BL, CF, CH, CC, CN, CT, CW, CU, DT, DV, DG, EP, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, LA, LN, ME, ML, MF, MZ, MN, MR, PA, PT, RB, RT, SH, SM, ST, WL, YM
Juncus articulatus L.		Juncaceae	BL, DG, EA, EP, JF, ME, MZ
Juncus biglumis L.		Juncaceae	BL, CC, GA, LR, ST
Juncus brachycephalus (Engelmann) Buchenau		Juncaceae	EP
Juncus brevicaudatus (Engelmann) Fernald		Juncaceae
Juncus bryoides F. J. Hermann		Juncaceae	MF
Juncus bufonius L. var. bufonius		Juncaceae	AM, AL, BA, BL, CC, DV, DG, EP, EL, FN, GL, GN, JF, KC, LR, LA, LN, ME, MF, MZ, MN, MR, RB, TL
Juncus bufonius L. var. occidentalis F. J. Hermann		Juncaceae
Juncus castaneus J. E. Smith		Juncaceae	BL, CC, CU, GL, GA, GN, LR, PA, SH, SJ, ST
Juncus compressus Jacquin		Juncaceae	AH, BL, GF, JA, JF, LR, LN, ME, MZ, WL
Juncus confusus Coville		Juncaceae	BL, EP, GL, GA, GN, JA, LR, ME, MF, MZ, MN, PA, PT, RB, RT, SJ
Juncus drummondii E. Meyer		Juncaceae	AA, BL, CC, DT, DL, EA, EP, GF, GL, GA, GN, HF, JA, LK, LP, LR, ME, MZ, PA, PT, RB, RG, RT, SJ, ST
Juncus dudleyi Wiegand	[Juncus tenuis Willdenow var. dudleyi (Wiegand) F.J. Hermann]	Juncaceae	AA, BA, BL, DG, EA, EP, GF, GL, GA, GN, JF, LR, LA, ME, MF, MN, WL, YM
Juncus effusus L.		Juncaceae	BL, LR
Juncus ensifolius Wikstrom		Juncaceae	AA, DL, GF, JA, MF, RT
Juncus filiformis L.		Juncaceae	BL, GA, JA, RT
Juncus gerardii Loiseleur		Juncaceae	AM, BL, LO
Juncus hallii Engelmann		Juncaceae	DT, DL, GA, JA, PA
Juncus interior Wiegand		Juncaceae	AM, AL, BL, DG, EP, JF, LR, LA, LN, ME, MF, MN, MR, WL, YM
Juncus longistylis Torrey		Juncaceae	BL, CT, CU, DT, DG, EA, EP, GL, GA, GN, HF, JA, JF, LP, LR, ME, ML, MF, MZ, MN, PA, PT, RT, SH, ST, TL, WL
Juncus marginatus Rostkovius		Juncaceae	BL
Juncus mertensianus Bongard		Juncaceae	AL, BL, CF, CC, CU, EA, GF, GL, GA, GN, HN, LP, LR, MZ, PA, PT, RB, RT, SM, SJ, ST
Juncus nevadensis S. Watson		Juncaceae	BL, DT, GL, ME, MF, PA, RT
Juncus nodosus L.		Juncaceae	AA, BA, BL, CU, DG, EA, EP, GN, JF, LP, LR, ME, MZ, RB, WL
Juncus parryi Engelmann		Juncaceae	BL, CF, CC, DL, GL, GA, GN, HF, LP, LR, ME, PA, RT, ST
Juncus platyphyllus (Wiegand) Fernald		Juncaceae	BL
Juncus saximontanus A. Nelson		Juncaceae	AA, BL, CC, CN, CT, CU, DG, EA, EP, GF, GA, GN, JA, JF, LP, LR, ME, MF, MZ, MN, PA, PT, RB, RT, SJ, SM, ST
Juncus tenuis Willdenow		Juncaceae	BL, MN
Juncus torreyi Coville		Juncaceae	AL, AH, AA, BA, BL, CU, DG, EA, EP, JF, KC, LR, LN, LO, ME, MZ, MN, OT, SH, SW, WL, YM
Juncus tracyi Rydberg		Juncaceae	AA, BL, DT, EA, GA, GN, JA, JF, ME, MN, PT, RB, RT, SM
Juncus triglumis L.		Juncaceae	BL, CC, GA, GN, LK, LR, PA, ST
Juncus tweedyi Rydberg		Juncaceae	LR
Juncus vaseyi Engelmann		Juncaceae	BL, GA, LR
Juniperus communis L. subsp. alpina (J. E. Smith) Celakovsky		Cupressaceae	AL, AA, BL, CF, CC, CN, CT, CU, DT, DL, DG, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, ME, ML, MF, MZ, MN, PA, PE, RB, RG, RT, SM, SJ, ST, TL
Kallstroemia parviflora Norton		Zygophyllaceae	BA, KW, LA, OT, PE
Kalmia microphylla (Hooker) Heller		Ericaceae	BL, CC, CN, GL, GA, JA, LK, LR, RT, ST
Knautia arvensis (L.) Coulter		Dipsacaceae	JF, PT, RB, RT
Kobresia myosuroides (Villars) Fiori & Paoli		Cyperaceae	AL, AA, BL, CF, CC, EP, GL, GA, GN, HN, LK, LR, ML, PA, PT, SH, SJ, ST
Kobresia schoenoides (C. A. Meyer) Steudel		Cyperaceae	BL, CC, GA, LR, PA, ST
Kobresia simpliciuscula (Wahlenberg) Mackenzie		Cyperaceae	BL, CC, GA, GN, PA
Kochia americana S. Watson		Chenopodiaceae	DT, ME, MZ, MN
Koeleria macrantha (Ledebour) Schultes		Poaceae	AL, AA, BL, CC, CU, DL, DG, EP, EL, GF, GL, GA, GN, HF, JF, KC, LP, LK, LR, LA, LN, LO, ME, ML, MF, MZ, MN, MR, PA, PL, PT, PE, RB, RT, SH, SM, SJ, SW, TL, WN, WL
Koenigia islandica L.		Polygonaceae	BL, CC, EP, GA, LR
Krameria lanceolata Torrey		Krameriaceae	BA, LA
Krascheninnikovia lanata (Pursh) Meeuse & Smit	[Eurotia lanata (Pursh) Moquin; Ceratoides lanata (Pursh) J.T. Howell]	Chenopodiaceae	AL, BL, CF, CN, DT, DV, DL, EL, FN, GF, GA, GN, JA, JF, KW, LR, LA, LN, LO, ME, MF, MZ, MN, PE, RB, RG, SH, WL, YM
Krigia biflora (Walter) S. F. Blake		Asteraceae	CU, EP
Lactuca biennis (Moench) Fernald		Asteraceae	BL, LR, RB, RT
Lactuca canadensis L.		Asteraceae	BL, DG, EP, JF
Lactuca graminifolia Michaux		Asteraceae
Lactuca ludoviciana (Nuttall) Riddell		Asteraceae	WL
Lactuca serriola L.		Asteraceae	BA, BL, CH, EP, EL, GN, HF, JF, KW, KC, LP, LA, LN, LO, ME, MF, MZ, MN, PT, RT, YM
Lactuca tatarica (L.) C. A. Meyer subsp. pulchella (Pursh) Stebbins		Asteraceae	AL, AA, BL, CF, CN, DT, DV, EP, GN, HF, JA, JF, KC, LP, LK, LR, LA, LN, LO, ME, MF, MZ, MR, PA, RB, RT, SH, TL, WL
Lamium amplexicaule L.		Lamiaceae	BL, KC, MR
Lamium purpureum L.		Lamiaceae
Lappula marginata (Bieberstein) Guerke		Boraginaceae	AH, BA, DT, FN, KW, LA, LN, ME, MF, MZ, MN, OT, RB, SW, WL
Lappula redowskii (Hornemann) Greene		Boraginaceae	AH, AL, AA, BA, BL, CF, CH, CC, CN, CU, DT, DV, DL, DG, EP, GF, GL, GA, GN, HF, JA, JF, KW, KC, LP, LR, LA, LN, LO, ME, ML, MF, MZ, MN, OT, PA, PE, RB, RG, RT, SH, SM, TL, WL, YM
Lappula squarrosa (Retzius) Dumont de Cours		Boraginaceae	DL, EA, GF, GN, JA, LK, ME, MF, MZ, PT, RB, RT, ST
Lapsana communis L.		Asteraceae	EP, JF
Lathyrus brachycalyx Rydberg var. zionis (C. L. Hitchcock) Welsh		Fabaceae	ME
Lathyrus eucosmus Butters & St. John		Fabaceae	AL, AH, AA, BA, BL, CN, CT, EP, EL, GN, JF, LP, LK, LA, LN, ME, MN, MZ, OT, SM
Lathyrus latifolius L.		Fabaceae	BL, CT, ME
Lathyrus leucanthus Rydberg		Fabaceae	AA, BL, CN, CU, DT, DL, DG, EA, GF, GA, GN, HF, JA, JF, LP, LR, LA, ME, MZ, MN, PA, PT, PE, RB, RG, RT, SM, ST
Lathyrus pauciflorus Fernald		Fabaceae	LP, MZ
Lathyrus polymorphus Nuttall subsp. incanus (Small & Rydberg) C. L. Hitchcock		Fabaceae	BA, DG, EP, EL, KC, LA, LN, LO, SW, WL, YM
Lathyrus polymorphus Nuttall subsp. polymorphus		Fabaceae
Leersia oryzoides (L.) Swartz		Poaceae	BA, BL, DG, JF, LA, LN, ME, WL
Leiostemon ambiguus (Torrey) Greene	[Penstemon ambiguus Torrey]	Scrophulariaceae	BA, CH, CW, EP, KC, LN, LO, PL, WN, YM
Lemna gibba L.		Lemnaceae
Lemna minor L.		Lemnaceae	AH, BA, DT, EL, EP, GN, JA, JF, KC, LR, LA, LN, ME, MN, MR, RB, TL, YM
Lemna minuscula Herter		Lemnaceae	AL, BA, BL, GA, LN, RB, YM
Lemna trisulca L.		Lemnaceae	CU, GF, GN, JA, ME, RB
Lemna turionifera Landolt		Lemnaceae	AL, AA, BL, EL, GA, JF, LP, LR, MF, RT, SW, WL, YM
Lemna valdiviana Philippi		Lemnaceae
Leonurus cardiaca L.		Lamiaceae	BL, DG, HF, WL
Lepidium alyssoides Gray		Brassicaceae	AL, CF, CN, CT, DT, GN, LK, ME, ML, PA, RB, RG, SH, TL
Lepidium alyssoides Gray var. alyssoides		Brassicaceae	AL, CF, CN, CT, LK, ML, PA, RG, SH, TL
Lepidium alyssoides Gray var. eastwoodiae		Brassicaceae	DT, GN, ME, RB
Lepidium bourgeauanum Thellung		Brassicaceae
Lepidium crenatum (Greene) Rydberg		Brassicaceae	DT, ME, MF, MZ, MN, RB
Lepidium densiflorum Schrader		Brassicaceae	AM, AA, BA, BL, CF, CC, CN, DT, EP, EL, GL, GA, GN, HF, JA, JF, KW, KC, LR, LA, LN, LO, ME, MF, MZ, MN, OR, PA, RB, RT, SH, SM, SJ, SW, WL, YM
Lepidium lasiocarpum Nuttall		Brassicaceae	ME, MZ, MN
Lepidium montanum Nuttall		Brassicaceae	AA, EA, GF, GN, HN, ME, MF, MZ, MN, RB
Lepidium montanum Nuttall subsp. alyssoides (A. Gray) C. L. Hitchcock		Brassicaceae
Lepidium montanum Nuttall var. coloradense		Brassicaceae	EA
Lepidium montanum Nuttall var. jonesii		Brassicaceae	DT, ME, MF, MZ, MN
Lepidium montanum Nuttall var. montanum		Brassicaceae	AA, DT, GF, GN, HN, MF, MZ
Lepidium montanum Nuttall var. spathulatum (B. L. Robinson) C. L. Hitchcock		Brassicaceae
Lepidium montanum Nuttall var. tenellum (L. Williams) C. L. Hitchcock		Brassicaceae	DT, GF, GN, ME, MF, MN, PT, RB
Lepidium montanum Nuttall var. wyomingense		Brassicaceae	MF
Lepidium perfoliatum L.		Brassicaceae	AH, BL, DT, DV, EA, GF, GA, GN, JA, LP, LN, ME, MF, MZ, MN, PT, RB, ST, WL
Lepidium ramosissimum A. Nelson		Brassicaceae	AL, CF, CC, CU, EA, GL, JA, MN, PA, RB, RT, SH, TL
Lepidium sativum		Brassicaceae	GN
Lepidium strictum (S. Watson) Rattan		Brassicaceae	ME, SM
Lepidium virginicum L.		Brassicaceae	BL, LR, MZ, PA, PT
Lepidotheca suaveolens (Pursh) Nuttall	[Matricaria matricarioides (Lessing) T.C. Porter]	Asteraceae	BL, DG, EP, GL, JA, LR, ME, PA, PT, RT, SM, ST, TL
Leptodactylon caespitosum Nuttall		Polemoniaceae	MF, RB, WL
Leptodactylon pungens (Torrey) Rydberg		Polemoniaceae	AM, AH, CF, CT, CU, EA, FN, GF, GN, HF, JA, LR, LA, ME, ML, MF, MZ, PE, RB, RG, SH, WL
Leptodactylon watsonii (A. Gray) Rydberg		Polemoniaceae	ME, MF, MN
Lesquerella alpina (Nuttall ex Torrey & Gray) S. Watson		Brassicaceae	GF, LO, MF, RB, WL
Lesquerella alpina (Nuttall ex Torrey & Gray) S. Watson subsp. alpina		Brassicaceae
Lesquerella arenosa (Richardson) Rydberg var. argillosa Rollins & Shaw		Brassicaceae	LO, WL
Lesquerella calcicola Rollins		Brassicaceae	EP, FN, LA, PE
Lesquerella congesta Rollins		Brassicaceae	RB
Lesquerella fendleri (A. Gray) S. Watson		Brassicaceae	FN, MZ, OT, PE, SJ
Lesquerella ludoviciana (Nuttall) S. Watson		Brassicaceae	AH, EP, EL, JA, KC, LR, LN, LO, ME, MF, MN, MR, SW, WN, WL, YM
Lesquerella montana (A. Gray) S. Watson		Brassicaceae	AL, AH, AA, BL, CU, EP, EL, FN, GL, HF, JA, JF, LR, LA, ML, MZ, PA, RG, SH, TL, WN
Lesquerella ovalifolia Rydberg		Brassicaceae	BA, FN, LA, PW, PE
Lesquerella parviflora Rollins		Brassicaceae	GF, ME, RB
Lesquerella parvula Greene	[Lesquerella alpina (Nuttall ex Torrey & Gray) S. Watson subsp. parvula (Greene) Rollins & Shaw]	Brassicaceae	DL, GA, SM
Lesquerella pruinosa Greene		Brassicaceae	AA
Lesquerella rectipes Wooton & Standley		Brassicaceae	AA, DT, LP, ME, MZ, MN, SM
Lesquerella vicina Anderson, Reveal & Rollins		Brassicaceae	MN, OR
Leucacantha cyanus (L.) Nieuwland & Lunell		Asteraceae	AH, BL
Leucantha solstitialis (L.) Loeve & Loeve		Asteraceae	BL, ME
Leucanthemum maximum (Ramond) DC		Asteraceae	PT
Leucanthemum vulgare Lamarck	[Chrysanthemum leucanthemum var. pinnatifidum]	Asteraceae	AA, BL, DL, EA, EP, GA, GN, JF, LP, LR, ME, MZ, PT, RT, SM
Leucocrinum montanum Nuttall ex A. Gray		Liliaceae	AA, BA, BL, CU, DV, DG, EP, EL, JF, KC, LP, LA, LR, LN, LO, MR, OT, RT, SW
Leucopoa kingii (S. Watson) W. A. Weber	[Hesperochloa kingii (S. Wats.) Rydb., Festuca kingii (S. Wats.) Scribner]	Poaceae	BL, GN, JA, LR, MF, MN
Levisticum officinale W. Koch		Apiaceae	BL, CN
Lewisia rediviva Pursh		Portulacaceae	GA, JA, MF
Leymus ambiguus (Vasey & Scribner) D. Dewey	[Elymus ambiguus Vasey & Scribner]	Poaceae	AL, BL, CC, EP, JF, LR
Leymus cinereus (Scribner & Merrill) Loeve	[Elymus cinereus Scribner & Merrill]	Poaceae	CF, DT, DL, EA, EP, GF, GA, GN, JA, LR, ME, MF, MZ, MN, PT, RB, RT, SH, ST
Leymus salina (Jones) Loeve	[Elymus salina Jones]	Poaceae	DT, GF, ME, MF, MZ, MN, RB, SM
Leymus triticoides (Buckley) Pilger	[Elymus triticoides Buckley]	Poaceae	AL, BL, EP, ML, MZ, SH
Liatris lancifolia (Greene) Kittell		Asteraceae
Liatris ligulistylis (A. Nelson) K. Schumann		Asteraceae	AA, CU, DG, EP, GA, LR, PA, RB, WL
Liatris punctata Hooker		Asteraceae	BA, BN, BL, CH, DG, EP, EL, JF, KC, LR, LA, LN, LO, PE, SH, SW, WN, WL, YM
Liatris squarrosa (L.) Michaux var. glabrata (Rydberg) Gaiser		Asteraceae	PL, YM
Lidia obtusiloba (Rydberg) Loeve & Loeve	[Minuartia obtusiloba (Rydberg) House]	Alsinaceae	AL, AA, BL, CC, CT, CU, DL, EA, EP, GF, GL, GA, GN, HF, JA, LP, LK, LR, ME, ML, MZ, PA, PT, RT, SH, SJ, ST
Ligularia amplectens (A. Gray) W. A. Weber	[Senecio amplectens A. Gray]	Asteraceae	AL, AA, CF, CC, CT, CU, EA, GA, GN, HN, HF, LP, LK, MZ, PA, PT, RG, SH, SJ, ST
Ligularia bigelovii (A. Gray) W. A. Weber var. hallii (A. Gray) W. A. Weber	[Senecio bigelovii A. Gray in Torrey]	Asteraceae	AL, AA, CC, CN, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, HF, JA, LP, ME, ML, MZ, MN, PA, PT, RT, SH, SM, SJ, TL
Ligularia holmii (Greene) W. A. Weber	[Senecio amplectens A. Gray var. holmii (Greene) Harrington]	Asteraceae	AL, AA, BL, CF, CC, DL, GA, GN, HN, JA, LP, LR, ME, ML, MZ, PA, PT, RB, RG, RT, SH, SM, SJ, ST
Ligularia porteri (Greene) W. A. Weber	[Senecio porteri Greene]	Asteraceae	CF, GN, HN, PT, SJ
Ligularia pudica (Greene) W. A. Weber	[Senecio pudicus Greene]	Asteraceae	BL, CF, CC, CU, EP, GF, GN, HN, JF, LK, LR, ML, MN, OR, PA, PT, ST, TL
Ligularia soldanella (A. Gray) W. A. Weber	[Senecio soldanella A. Gray]	Asteraceae	AL, CF, CC, GN, LP, LK, MZ, OR, PA, PT, SJ, ST
Ligularia taraxacoides (A. Gray) W. A. Weber	[Senecio taraxacoides (A. Gray) Greene]	Asteraceae	BL, CF, CC, CT, CU, EA, EP, GA, HF, LK, LR, PA, SH, ST
Ligusticum porteri Coulter & Rose		Apiaceae	AA, BL, CN, CT, CU, DT, DL, DG, EA, EP, GF, GL, GN, HF, JA, JF, LP, LR, ME, MZ, MN, OR, PT, RB, RT, SH, SM, SJ, ST
Ligusticum tenuifolium S. Watson	[Ligusticum filicinum S. Watson var. tenuifolium (S. Watson) Mathias & Constance]	Apiaceae	BL, EA, GL, GA, JA, LR, PT, RT, ST
Ligustrum vulgare L.		Oleaceae	BL
Lilium philadelphicum L.		Liliaceae	BL, CF, CU, DG, EP, JF, LR, LA
Limnorchis dilatata (Pursh) Rydberg subsp. albiflora (Chamisso) Loeve & Simon	[Habenaria dilatata (Pursh) Hooker]	Orchidaceae	BL, CC, CN, EA, GF, GL, GA, JA, LP, LR, LA, ME, MF, PT, RB, RT, ST
Limnorchis ensifolia Rydberg		Orchidaceae	AA, CF, EA, GF, ME, OR, PT, SH, SJ
Limnorchis hyperborea (L.) Rydberg	[Habenaria hyperborea (L.) R. Brown]	Orchidaceae	AA, BL, CC, CN, CT, CU, DT, DG, EA, EP, GF, GA, GN, HN, JA, JF, LR, LA, ME, MF, MZ, MN, PA, PT, RT, SH, SM, SJ, TL
Limnorchis stricta (Lindley) Rydberg	[Habenaria saccata Greene]	Orchidaceae	BL, CU, DT, EP, FN, HF, JA, JF, LP, LR, LA, PA, RB, SM, ST, TL
Limnorchis zothecina (Higgins & Welsh) W. A. Weber	[Habenaria zothecina Higgins & Welsh]	Orchidaceae	MF
Limosella aquatica L.		Scrophulariaceae	BL, CC, CU, DV, DG, GF, GL, GN, JF, LR, ME, MF, MZ, MN, PA, RT, SH, TL, WL
Linanthastrum nuttallii (A. Gray) Ewan		Polemoniaceae	AA, CN, GN, JA, LK, ML, RT
Linanthus harknessii (Curran) Greene var. septentrionalis (Mason) Jepson & Bailey		Polemoniaceae	GF, GA, GN, ME, MF, MN, RB, RT
Linaria canadensis Dumont de Cours var. texana (Scheele) Pennell		Scrophulariaceae	BL, JF, LR
Linaria genistifolia (L.) P. Miller subsp. dalmatica (L.) Maire et al.	[Linaria dalmatica (L.) P. Miller var. macedonica Fenzl ]	Scrophulariaceae	BA, BL, DL, EP, GF, JF, LR, LA, MF, MZ, PT, RT, SM
Linaria vulgaris P. Miller		Scrophulariaceae	BL, DG, EA, EP, GA, GN, JF, LP, LK, LR, ME, MN, PA, PT, RB, RT, SM, TL
Lindernia dubia (L.) Pennell var. anagallidea (Michaux) Cooperrider		Scrophulariaceae	BL
Linnaea borealis L. subsp. americana (Forbes) Hulten ex Clausen		Caprifoliaceae	BL, CF, CC, CU, DG, GF, GL, GA, GN, HF, JA, JF, LP, LR, ML, PA, RT, SJ, SM, ST, TL
Linum usitatissimum L.		Linaceae
Listera borealis Morong		Orchidaceae	CF, CC, EA, GF, GA, GN, LK, LR, ME, ST
Listera convallarioides (Swartz) Nuttall		Orchidaceae	BL, LR, RT
Listera cordata (L.) R. Brown subsp. nephrophylla (Rydberg) Loeve & Loeve		Orchidaceae	AA, BL, CC, EA, GL, GA, GN, JA, LR, OR, RB, RT, SH, SJ, ST
Lithophragma glabrum Nuttall		Saxifragaceae	BL, DT, DL, GF, GA, GN, LR, ME, MF, MZ, MN, RT, SM, ST
Lithophragma parviflorum (Hooker) Nuttall ex Torrey & Gray		Saxifragaceae	LR, MF, MZ, RT
Lithophragma tenellum Nuttall		Saxifragaceae	CT, DL, GA, GN, ME, MZ, MN, RB, SM
Lithospermum croceum Fernald		Boraginaceae	PL, WN, YM
Lithospermum incisum Lehmann		Boraginaceae	AL, AH, AA, BA, BL, CF, CH, CN, CU, DT, DG, EA, EP, GF, GN, JF, KW, KC, LP, LR, LA, LN, LO, ME, MF, MZ, MN, MR, OR, PA, PL, PW, RB, SH, SM, SW, ST, WN, WL, YM
Lithospermum multiflorum Torrey ex A. Gray		Boraginaceae	AA, BL, CF, CC, CN, CU, DL, DG, EP, EL, GN, HN, HF, JF, LP, LR, ME, ML, MZ, OR, PA, PE, RG, SH, SJ, TL
Lithospermum ruderale Douglas ex Lehmann		Boraginaceae	DL, EA, GA, GN, MF, MZ, MN, RB, RT, ST
Lloydia serotina (L.) Salisbury ex Reichenbach		Liliaceae	BL, CF, CC, DL, EA, GL, GA, GN, HN, LP, LK, LR, MZ, PA, PT, SH, SJ, ST
Lobelia cardinalis L. subsp. graminea (Lamarck) McVaugh		Campanulaceae	BA, EP, LA, PE, YM
Lobelia siphilitica L. var. ludoviciana A. De Candolle		Campanulaceae	BL, DG, EP, JF, LR, MR, PE, WL, YM
Lobularia maritima (L.) Desvaux		Brassicaceae	EP
Lolium perenne L. subsp. italicum (A. Braun) Syme		Poaceae	BL, GF, GA, JF, ME, MZ, OT, PT, TL
Lomatium bicolor (S. Watson) Coulter & Rose var. leptocarpum (Nuttall ex Torrey & Gray) Schlessman		Apiaceae	DT, GN, ME, MF, RT
Lomatium concinnum (Osterhout) Mathias		Apiaceae	DT, MN, OR
Lomatium dissectum (Nuttall) Mathias & Constance var. multifidum (Nuttall) Mathias & Constance		Apiaceae	EA, GF, GA, GN, JA, LP, ME, MF, MZ, MN, RB, RT
Lomatium foeniculaceum (Nuttall) Coulter & Rose subsp. foeniculaceum		Apiaceae	LA
Lomatium foeniculaceum (Nuttall) Coulter & Rose subsp. macdougalii (Coulter & Rose) Theobald		Apiaceae	RB
Lomatium grayi Coulter & Rose		Apiaceae	DT, GF, GN, LP, ME, MF, MZ, MN, RB, SM
Lomatium juniperinum (Jones) Coulter & Rose		Apiaceae	MF, RB, RT
Lomatium macrocarpum (Hooker & Arnott) Coulter & Rose		Apiaceae	ME, MF, RB, RT
Lomatium orientale Coulter & Rose		Apiaceae	AH, BL, DV, EP, EL, GF, GA, JA, JF, LR, MF, RB, ST
Lomatium triternatum (Pursh) Coulter & Rose subsp. platycarpum (Torrey) Cronquist		Apiaceae	DT, DL, GF, GA, GN, LP, ME, MF, MZ, MN, RB, SM, ST
Lomatogonium rotatum (L.) Grisebach subsp. tenuifolium (Grisebach) Porsild		Gentianaceae	BL, CC, EL, GL, JA, LK, LR, PA, RT, TL
Lonicera morrowii A. Gray in Perry		Caprifoliaceae	BL, EP, LP
Lonicera tatarica L.		Caprifoliaceae	BL, EP
Lotus tenuis Waldstein & Kitaibel		Fabaceae	BL, JF, MZ, PT, RT
Lotus wrightii (A. Gray) Greene		Fabaceae	AA, DG, GN, LP, MZ
Lunaria annua L.		Brassicaceae	BL
Lupinus ammophilus Greene		Fabaceae	AA, LP, ME, MZ, MN, SM
Lupinus argenteus Pursh		Fabaceae	AL, AH, AA, BL, CC, CN, CT, CU, DT, DL, DG, EA, EP, EL, GF, GL, GA, GN, HF, JA, JF, LK, LR, LA, ME, ML, MF, MZ, MN, OR, PA, PT, RB, RT, SH, SM, ST, WL
Lupinus bakeri Greene		Fabaceae	AA, CN, GF, GN, LP, MZ, RB, SH
Lupinus bakeri Greene subsp. amplus (Greene) Fleak & Dunn		Fabaceae
Lupinus bakeri Greene subsp. bakeri		Fabaceae
Lupinus brevicaulis S. Watson		Fabaceae	DT, GF, LP, ME, MZ, MN, RB
Lupinus caudatus Kellogg		Fabaceae	CN, CT, DT, DL, EL, GF, GA, GN, JA, LP, LN, ME, ML, MF, MZ, MN, RB, RG, RT, SH, ST, TL
Lupinus crassus Payson		Fabaceae	MN
Lupinus kingii S. Watson		Fabaceae	AL, AA, CN, CT, DL, GN, HF, LP, ML, MZ, RG, SH, TL
Lupinus lasalensis Dunn, ined.		Fabaceae
Lupinus lepidus Douglas subsp. caespitosus (Nuttall) Detling	[Lupinus caespitosus Nuttall]	Fabaceae	GA, GN, JA, LK, ME, RT, SH, ST
Lupinus parviflorus Nuttall		Fabaceae	CN, EP, GN, JA, JF, ME, ML, MN, RG, SH
Lupinus parviflorus Nuttall subsp. parviflorus		Fabaceae
Lupinus plattensis S. Watson		Fabaceae	CF, CU, EL, EP, HF, LR, LA, LN
Lupinus prunophilus Jones		Fabaceae	DT, GA, GN, LP, MF, MN, RB, RT, SM, ST
Lupinus pusillus Pursh		Fabaceae	AM, AL, BA, BN, BL, CH, CT, EP, EL, HF, KW, LP, LA, LN, LO, MF, MZ, MR, OT, PE, SH, WL, YM
Lupinus pusillus Pursh subsp. pusillus		Fabaceae
Lupinus pusillus Pursh subsp. rubens (Rydberg) Dunn		Fabaceae
Lupinus sericeus Pursh		Fabaceae	AA, CN, DT, DL, GN, ME, ML, RG
Lupinus sericeus Pursh var. egglestonianus C. P. Smith		Fabaceae
Lupinus sericeus Pursh var. flexuosus (Lindley) C. P. Smith		Fabaceae
Luzula comosa E. Meyer		Juncaceae	BL, EA, EP, GL, GA, JA, PA, PT
Luzula parviflora (Ehrhart) Desvaux		Juncaceae	BL, CC, CU, DT, DL, DG, EP, GF, GL, GA, GN, HN, HF, JA, LP, LR, ME, ML, MZ, PA, RG, RT, SH, SM, SJ, ST, TL
Luzula spicata (L.) De Candolle		Juncaceae	AL, AA, BL, CF, CC, EP, GF, GL, GA, GN, JA, LK, LP, LR, ME, ML, MN, PA, PT, RG, SH, SM, SJ, ST
Luzula subcapitata (Rydberg) Harrington		Juncaceae	BL, CF, CC, EA, GL, GA, GN, LK, LR, PT, SJ, ST
Lycium barbarum L.		Solanaceae	BL, EP, GA, KW, ME, MF, MZ, MN
Lycium pallidum Miers		Solanaceae	BA, HF, LA, MZ, OT
Lycopodium annotinum L.		Lycopodiaceae	BL, CF, EA, GL, GA, GN, LR, SJ, ST
Lycopodium dubium Zoega	See Lycopodium annotinum L.	Lycopodiaceae
Lycopus americanus Muhlenberg ex W. Barton		Lamiaceae	BA, BL, DV, DG, EP, JF, KC, LP, LA, LN, ME, MN, SW, WL, YM
Lycopus asper Greene		Lamiaceae	AL, BL, JF, MN, RG, WL
Lycopus uniflorus Michaux		Lamiaceae	BL
Lycurus setosus (Nuttall) C. Reeder		Poaceae	BA, BL, EP, JF, LR, LA
Lygodesmia arizonica Tomb		Asteraceae	MZ
Lygodesmia doloresensis Tomb		Asteraceae	ME
Lygodesmia grandiflora (Nuttall) Torrey & Gray		Asteraceae	GF, ME, MF, MZ, MN, RB, SM
Lygodesmia juncea (Pursh) D. Don		Asteraceae	AM, AL, BA, BN, BL, CH, CT, CW, DG, EP, EL, HF, JF, KW, KC, LR, LA, LN, OT, PW, PE, SW, TL, WL, YM
Lysiella obtusata (Banks ex Pursh) Britton & Rydberg		Orchidaceae	BL, CF, CC, EA, GF, GA, GN, JA, JF, LR, ME, PA, PT, RT, SH, SM, ST
Lysimachia ciliata L.		Primulaceae	BL, CU, DG, EP, FN, GF, JF, LA, MF, PW, RT, WL
Lysimachia nummularia L.		Primulaceae	BL
Lysimachia vulgaris L.		Primulaceae	BL
Lythrum alatum Pursh		Lythraceae	AH, BL, JF
Lythrum salicaria L.		Lythraceae	BL, JF, ME
Machaeranthera bigelovii (A. Gray) Greene		Asteraceae	CN, CU, EP, HF, JF, LR, LA, PA, SH, WL
Machaeranthera canescens (Pursh) A. Gray		Asteraceae	AM, AL, AA, CH, CN, CT, CU, DT, DG, EP, GF, GA, GN, JA, JF, KC, LP, LR, LN, LO, ME, ML, MF, MZ, MN, PT, RB, RG, RT, SH, SM, ST, WN, WL
Machaeranthera canescens (Pursh) A. Gray var. ambigua B. Turner		Asteraceae
Machaeranthera canescens (Pursh) A. Gray var. aristata (Eastwood) B. Turner		Asteraceae
Machaeranthera canescens (Pursh) A. Gray var. glabra A. Gray		Asteraceae
Machaeranthera coloradoensis (A. Gray) Osterhout		Asteraceae	DL, GN, HN, LP, PA, PT, SH, SJ
Machaeranthera coloradoensis (A. Gray) Osterhout var. brandegei (Rydberg) T. J. Watson, {ined.}		Asteraceae
Machaeranthera coloradoensis (A. Gray) Osterhout var. coloradoensis		Asteraceae
Machaeranthera commixta Greene		Asteraceae	LP, ME
Machaeranthera gracilis (Nuttall) Shinners		Asteraceae	AA, LP, ME, MZ
Machaeranthera grindelioides (Nuttall) Shinners		Asteraceae	DT, GF, GN, LR, ME, MF, MZ, MN, OR, RB, SM
Machaeranthera parviflora A. Gray		Asteraceae	AL, MN, SH
Machaeranthera pattersonii (A. Gray) Greene		Asteraceae	BL, CF, CC, CN, CT, EP, GA, GL, HF, JA, JF, LR, ML, PA, SJ, TL
Machaeranthera pinnatifida (Hooker) Shinners	[Haplopappus spinulosus (Pursh) De Candolle]	Asteraceae	AM, AL, AH, AA, BA, BN, BL, CH, CW, DT, EL, FN, GF, JF, KW, KC, LR, LA, LN, LO, ME, MZ, MN, OT, PW, PE, SH, SW, SM, WL, YM
Machaeranthera pinnatifida (Hooker) Shinners var. glaberrima (Rydberg) Turner & Hartman		Asteraceae
Machaeranthera pinnatifida (Hooker) Shinners var. paradoxa Turner & Hartman		Asteraceae
Machaeranthera pinnatifida (Hooker) Shinners var. pinnatifida		Asteraceae
Machaeranthera tanacetifolia (Humboldt, Bonpland, & Kunth) Nees		Asteraceae	AM, AL, BA, BN, BL, CW, DV, HF, KW, LR, LA, LN, LO, ME, MZ, MN, OT, PW, PE, RG, SH, WL
Maclura pomifera (Rafinesque) C. K. Schneider		Moraceae	DV, ME
Madia glomerata Hooker		Asteraceae	BL, DT, GA, JA, JF, LP, LR, LA, ME, MF, MZ, MN, PT, RB, RT
Mahonia fremontii (Torrey) Fedde		Berberidaceae	DT, GF, ME
Mahonia haematocarpa (Wooton) Fedde		Berberidaceae	LA
Mahonia repens (Lindley) G. Don		Berberidaceae	AA, BL, CN, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, ME, ML, MF, MZ, MN, PA, PE, PT, RB, RG, RT, SH, SJ, SM
Maianthemum amplexicaule (Nuttall) W. A. Weber	[Smilacina amplexicaule Nuttall]	Convallariaceae	AL, AA, BL, CN, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, ME, ML, MZ, MN, OR, PT, PE, RB, RG, RT, SH, SM, SJ
Maianthemum stellatum (L.) Link	[Smilacina stellata (L.) Desfontaines]	Convallariaceae	AL, AA, BL, CF, CC, CN, CU, DT, DV, DL, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, ME, ML, MF, MZ, OR, PA, PT, PE, RB, RG, RT, SH, SM, SJ, SW, ST, TL, WL
Malacothrix sonchoides (Nuttall) Torrey & Gray		Asteraceae	ME, MF, MZ, MN, SM
Malacothrix torreyi A. Gray		Asteraceae	DT, ME, MN
Malaxis monophyllos (L.) Solander ex Swartz subsp. brachypoda (A. Gray) Loeve & Loeve		Orchidaceae	BL, JF
Malcolmia africana (L.) R. Brown		Brassicaceae	DT, GF, ME, MF, MZ, MN, RB
Malus domestica Borkhausen		Rosaceae	BL, EP, JF, LP, ME, PE
Malva crispa (L.) L.		Malvaceae
Malva neglecta Wallroth		Malvaceae	BA, BL, CN, DV, EP, EL, HF, JF, KW, KC, LP, LA, LN, ME, MZ, MN, PT, RB, RT, WL
Malva parviflora L.		Malvaceae
Malvella leprosa (Ortega) Krapovickas		Malvaceae	KW
Malvella sagittifolia (A. Gray) Fryxell		Malvaceae	OT
Mariscus fendlerianus (Bockeler) Koyama	[Cyperus fendlerianus Boeckeler]	Cyperaceae	BL, EP
Mariscus filiculmis (M. Vahl) Koyama	[Cyperus filiculmis M. Vahl]	Cyperaceae	BL, LR
Mariscus schweinitzii (Torrey) Koyama	[Cyperus schweinitzii Torrey]	Cyperaceae	AM, BA, BN, BL, CH, DG, EP, KC, LA, LN, LO, PL, SW, WN, WL, YM
Marrubium vulgare L.		Lamiaceae	AA, BA, BL, GF, HF, JF, LP, LA, ME, MF, MZ, MN, OT, RB, SM
Marsilea vestita Hooker & Greville	[Marsilea mucronata A. Braun]	Marsileaceae	AL, BA, BL, CH, DG, EP, LA, LN, LO, SH, WL
Matricaria perforata Merat		Asteraceae	BL, DG, GA, GN, JF, ME, PT, ST
Medicago lupulina L.		Fabaceae	BL, CH, CU, DT, EP, GF, GA, GN, HF, JF, KC, LP, LR, LN, ME, MF, MZ, MN, PT, RB, TL, YM
Medicago sativa L.		Fabaceae	AL, BA, BL, CH, CN, EP, JF, KC, LP, LA, LR, LN, ME, MF, MZ, MN, PT, RT, SH, TL
Melampodium leucanthum Torrey & Gray		Asteraceae	BA, BN, EP, FN, HF, LA, OT, PW, PE
Melandrium dioicum (L.) Cosson & Germain		Caryophyllaceae	BL, CU, DT, EA, EP, GA, HF, JF, LR, MN, PT, RT
Melica porteri Scribner		Poaceae	AA, DL, DG, EP, GN, HN, JF, LP, ME, MN
Melilotus albus Medicus		Fabaceae	AL, AH, BA, BL, CH, CU, EP, EL, GF, GN, HF, JA, JF, KC, LP, LR, LA, LN, ME, MF, MZ, MN, OT, PT, RT, SM, WL, YM
Melilotus officinale (L.) Pallas		Fabaceae	AL, AA, BA, BL, CH, CU, DT, EP, GF, GL, GA, GN, HF, JA, JF, KC, LP, LR, LA, LN, ME, MF, MZ, MN, OT, PT, RB, RT, SM, SW, ST, TL, WL
Menodora scabra (Engelmann) A. Gray		Oleaceae	EP, FN, PE
Mentha arvensis L.		Lamiaceae	AL, BL, CN, CT, CU, DT, DV, DL, DG, EP, GF, GL, GA, GN, JA, JF, KC, LP, LK, LR, ME, ML, MF, MZ, MN, OR, PT, RB, RG, RT, SH, TL, WL, YM
Mentha piperita L.		Lamiaceae	BL
Mentha spicata L.		Lamiaceae	BL, LR, LA, WL
Mentzelia oligosperma Nuttall ex Sims		Loasaceae	BA, FN, LR, LA, PE
Menyanthes trifoliata L.		Menyanthaceae	BL, CN, EA, GF, GA, GN, JA, LR, MZ, RB, SJ, SM
Mertensia alpina (Torrey) G. Don		Boraginaceae	CC, CT, EP, ST, TL
Mertensia arizonica Greene var. grahamii L. Williams		Boraginaceae	MN, RB
Mertensia brevistyla S. Watson		Boraginaceae	DT, DL, EA, GF, GA, GN, HN, LP, ME, MF, MZ, MN, PT, RB, RG, RT, SM, ST
Mertensia ciliata (James ex Torrey) G. Don		Boraginaceae	AL, BL, CF, CC, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, MZ, OR, PA, PT, PE, RB, RT, SH, SM, SJ, ST, TL
Mertensia franciscana Heller		Boraginaceae	AA, CN, CT, DT, DL, EA, GF, GN, HF, LP, LA, ME, MZ, MN, PT, PE, RT, SM, SJ
Mertensia fusiformis Greene		Boraginaceae
Mertensia humilis Rydberg		Boraginaceae	JA
Mertensia lanceolata (Pursh) A. De Candolle		Boraginaceae	AL, AH, BL, CF, CC, CT, CU, DV, DL, DG, EA, EP, EL, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, LA, ML, MZ, PA, PT, RG, RT, SH, SJ, ST, TL
Mertensia lanceolata (Pursh) A. De Candolle var. lanceolata		Boraginaceae
Mertensia lanceolata (Pursh) A. De Candolle var. viridis A. Nelson		Boraginaceae
Mertensia oblongifolia (Nuttall) G. Don		Boraginaceae	MF
Mesyniopsis kingii (S. Watson) W. A. Weber	[Linum kingii S. Watson]	Linaceae	RB
Mesynium aristatum (Engelmann in Wislizenus) W. A. Weber	[Linum aristatum Engelmann in Wislizenius]	Linaceae	MZ
Mesynium australe (Heller) W. A. Weber	[Linum australe Heller]	Linaceae	AA, CU, LP, LA
Mesynium puberulum (Engelmann in A. Gray) W. A. Weber	[Linum puberulum Engelmann in A. Gray]	Linaceae	BA, BN, DT, LA, LO, ME, MZ, MN, OT, PE, SM, WL
Mesynium rigidum (Pursh) Loeve & Loeve	[Linum rigidum Pursh]	Linaceae	BA, BN, CH, KW, KC, LA, LO, OT, SW, WL, YM
Micranthes odontoloma (Piper) Heller	[Saxifraga odontoloma Piper]	Saxifragaceae	BL, CF, CC, CN, CU, DT, EA, GF, GL, GA, GN, HN, HF, JF, LP, LK, LR, ME, ML, MZ, PA, PT, RG, RT, SH, SJ, SM, ST
Micranthes oregana (T. J. Howell) Small	[Saxifraga oregana T.J. Howell]	Saxifragaceae	CF, CC, GL, GA, GN, LK, ME, ST
Micranthes rhomboidea (Greene) Small	[Saxifraga rhomboidea Greene]	Saxifragaceae	AL, BL, CF, CC, DG, DL, EA, EP, GF, GL, GA, GN, HN, HF, JF, LP, LK, LR, LA, ME, MZ, PA, PT, RB, RG, RT, SH, SM, SJ, ST, TL
Microseris nutans (Geyer ex Hooker) Schultz-Bipontinus		Asteraceae	BL, DT, EA, GF, GA, ME, MF, MZ, MN, RB, RT
Microsteris gracilis (Douglas ex Hooker) Greene subsp. humilis (Greene) V. Grant		Polemoniaceae	AA, BL, CU, DT, DL, DG, GF, GL, HF, JF, LR, LA, LN, ME, MF, MZ, MN, RB, RT, ST, WL
Mimosa borealis A. Gray		Fabaceae	BA, LA
Mimulus breweri (Greene) Coville		Scrophulariaceae	BL, EA, GA, LR, ST
Mimulus eastwoodiae Rydberg		Scrophulariaceae	DT, MN
Mimulus floribundus Douglas in Lindley		Scrophulariaceae	BL, DG, GA, GN, JF, LR, MF, MN, RG, RT
Mimulus gemmiparus W. A. Weber		Scrophulariaceae	GA, JF, PA
Mimulus glabratus Humboldt, Bonpland, & Kunth		Scrophulariaceae	BL, DT, DG, EP, JF, LR, LA, LN, ME, MF, MN, PA, RB, SH, WL, YM
Mimulus glabratus Humboldt, Bonpland, & Kunth var. fremontii (Bentham) Adele Grant		Scrophulariaceae
Mimulus glabratus Humboldt, Bonpland, & Kunth var. utahensis Pennell		Scrophulariaceae
Mimulus guttatus De Candolle		Scrophulariaceae	AL, AA, BL, CF, CN, CU, DT, DL, EA, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, LA, ME, ML, MF, MZ, OR, PA, PT, RB, RT, SH, SM, SJ, ST
Mimulus lewisii Pursh		Scrophulariaceae	JA, RT
Mimulus moschatus Douglas in Lindley		Scrophulariaceae	JA, RT
Mimulus ringens L.		Scrophulariaceae
Mimulus rubellus A. Gray		Scrophulariaceae	GN, ME, MF, MZ, MN, RT
Mimulus suksdorfii		Scrophulariaceae	MF
Mimulus tilingii Regel		Scrophulariaceae	AA, BL, GF, GL, GA, LP, LK, LR, PT, SJ, ST
Minuopsis nuttallii (Pax) W. A. Weber		Alsinaceae	MF
Mirabilis alipes (S. Watson) Pilz		Nyctaginaceae	RB
Mirabilis glandulosa (Standley) W. A. Weber		Nyctaginaceae	DL, ME, MZ, MN, RB
Mirabilis multiflora (Torrey) A. Gray		Nyctaginaceae	AL, AA, CF, CN, CT, DT, FN, HF, LA, ME, MZ, MN, OT, PE, RG
Mirabilis oxybaphoides (A. Gray) A. Gray		Nyctaginaceae	AA, CF, EP, FN, ME, MZ, RG, SH
Miscanthus sinensis Andersson		Poaceae	BL, DV
Mitella pentandra Hooker		Saxifragaceae	BL, CC, CN, DT, GF, GL, GA, GN, JA, LR, ME, MZ, PA, PT, RT, SJ, SM, ST
Mitella stauropetala Piper var. stenopetala (Piper) Rosendahl		Saxifragaceae	AA, BL, DL, EA, GF, GL, GN, HN, JA, LP, LR, ME, ML, MZ, OR, RB, RT, SM, SJ, ST
Moehringia lateriflora (L.) Fenzl		Alsinaceae	BL, CU, DG, GF, GL, GA, GN, HF, JF, LR, LA, MZ, PA, RB, RT, SH, SM, TL
Moehringia macrophylla (Hooker) Torrey		Alsinaceae	AA, GN, ML
Mollugo verticillata L.		Molluginaceae	BA, BL, CW
Monarda fistulosa L. var. menthifolia (R. Graham) Fernald		Lamiaceae	AH, AA, BL, CT, EP, GF, HF, JF, LP, LR, LA, ME, MZ, MN, PT, RB
Monarda pectinata Nuttall		Lamiaceae	AL, AH, BA, BL, CN, HF, JF, LP, LR, LA, MN, SH, WL
Monardella odoratissima Bentham		Lamiaceae	GF, GN, MN, OR, RB
Moneses uniflora (L.) A. Gray	[Pyrola uniflora L.]	Pyrolaceae	AL, BL, CF, CC, CU, DT, DG, GF, GL, GA, GN, HF, LP, LK, LA, ME, ML, MZ, OR, PA, RT, SH, SM, SJ, ST
Monolepis nuttalliana (Schultes) Greene		Chenopodiaceae	AA, BL, CC, CN, EP, EL, GF, GL, GA, GN, HF, JA, LP, LK, LR, ME, ML, MF, MZ, MN, MR, PA, RB, RG, RT, SH, ST, TL, WL
Monolepis pusilla Torrey		Chenopodiaceae
Monroa squarrosa (Nuttall) Torrey		Poaceae	AL, AH, BA, BN, BL, CH, CN, CT, CU, DV, EP, EL, JF, KW, KC, LA, LN, MF, MZ, MN, OT, PL, PW, SH, SW, WN, WL, YM
Morus alba L.		Moraceae	CH, ME
Muhlenbergia andina (Nuttall) A. S. Hitchcock		Poaceae	AA, CC, DT, DG, GA, ML, PE, SJ, TL
Muhlenbergia arenacea (Buckley) A. S. Hitchcock		Poaceae	PE
Muhlenbergia arenicola Buckley		Poaceae	BA, KW, LA, PW
Muhlenbergia asperifolia (Nees & Meyen ex Trinius) Parodi		Poaceae	AL, AH, BA, BL, CT, CU, DG, EA, FN, GF, GN, JF, KW, KC, LP, LA, LN, LO, ME, MF, MZ, RB, RG, SH, SM, SW, WL, YM
Muhlenbergia brevis Goodding		Poaceae	CN, SH
Muhlenbergia cuspidata (Torrey) Rydberg		Poaceae	LA, LN, LO
Muhlenbergia depauperata Scribner		Poaceae	ME, MZ
Muhlenbergia filiculmis Vasey		Poaceae	GA, GN, LR, ML, PA, SH, ST, TL
Muhlenbergia filiformis (Thurber ex S. Watson) Rydberg		Poaceae	BL, CC, CN, GL, GA, LR, ML, PA, PT, RT, ST
Muhlenbergia glomerata (Willdenow) Trinius		Poaceae
Muhlenbergia mexicana (L.) Trinius		Poaceae
Muhlenbergia minutissima (Steudel) Swallen		Poaceae	AL, CN, DG, GN, LP, LA, ME, ML, MN, RT, SH
Muhlenbergia montana (Nuttall) A. S. Hitchcock		Poaceae	AA, BL, CF, CC, CN, CU, DT, DG, EP, EL, GL, GN, HF, JF, LR, LA, ME, ML, MZ, MN, PA, RG, RT, SH, TL
Muhlenbergia pauciflora Buckley		Poaceae
Muhlenbergia porteri Scribner		Poaceae	FN, LA
Muhlenbergia pungens Thurber ex A. Gray		Poaceae	AL, CT, CW, EP, KC, LO, MF, PL, SW, WN, WL, YM
Muhlenbergia racemosa (Michaux) Britton, Sterns, & Poggenberg		Poaceae	AA, BA, BL, DG, EP, GN, JF, KC, LR, LA, LN, ME, MF, MN, PW, WL, YM
Muhlenbergia richardsonis (Trinius) Rydberg		Poaceae	AL, BL, CC, CU, EP, GL, GA, GN, JA, JF, LP, LR, ML, PA, RB, RG, RT, SH, TL
Muhlenbergia schreberi J. F. Gmelin		Poaceae	BL, DV
Muhlenbergia thurberi (Scribner) Rydberg		Poaceae	DT, ME
Muhlenbergia torreyi (Kunth) A. S. Hitchcock ex Bush		Poaceae	AH, BA, BL, CF, CH, CN, CT, EP, KC, LR, LA, LN, LO, OT, PE, WL
Muhlenbergia wolfii (Vasey) Rydberg		Poaceae
Muhlenbergia wrightii Vasey ex Coulter		Poaceae	AA, BL, CU, EP, GN, JF, LR, LA, LN, ME, MZ, RT
Muscaria adscendens (L.) Small	[Saxifraga adscendens L.]	Saxifragaceae	CC, CU, GA, GN, LP, LK, PA, PT, SJ, ST
Muscaria delicatula Small		Saxifragaceae	BL, CC, CU, EP, GF, GA, GN, HN, LP, LR, PA, SH, SJ, ST
Muscaria micropetala (Small) Fedde		Saxifragaceae	BL
Muscaria monticola (Small) Fedde		Saxifragaceae	CT, GN, PA, PT, ST
Musineon divaricatum (Pursh) Rafinesque		Apiaceae	AH, BL, DV, EL, JF, KC, LR, LA, LN, LO, MR, WL
Musineon divaricatum (Pursh) Rafinesque var. divaricatum		Apiaceae
Musineon divaricatum (Pursh) Rafinesque var. hookeri Torrey & Gray		Apiaceae
Myosotis asiatica (Vestergren) Schischkin & Sergievskaya		Boraginaceae	GF
Myosotis scorpioides L.		Boraginaceae	BL
Myosurus apetalus Gay		Ranunculaceae	JA, LP, ME, MN, MZ, RB, RT
Myosurus cupulatus S. Watson		Ranunculaceae	MN
Myosurus minimus L.		Ranunculaceae	BL, EP, GF, GN, JF, ME, MF, MZ, RT
Myosurus minimus L. subsp. minimus		Ranunculaceae
Myosurus minimus L. subsp. montanus Campbell		Ranunculaceae
Myriophyllum sibiricum Komarov		Haloragaceae	AH, BL, DV, EA, EP, GL, GA, JA, JF, LR, LN, MN, RB, RT, SM, TL
Myriophyllum verticillatum L.		Haloragaceae	GN
Najas guadalupensis (Sprengel) Magnus		Najadaceae	BN, BL, LA
Nama densum Lemmon		Hydrophyllaceae	MF
Nama dichotomum (Ruiz & Pavon) Choisy		Hydrophyllaceae	ME, SH
Nama hispidum A. Gray		Hydrophyllaceae
Nama retrorsum J.T. Howell		Hydrophyllaceae	MZ
Nassella viridula (Trinius) Barkworth	[Stipa viridula Trinius]	Poaceae	AA, BA, BL, CC, CN, DG, EP, EL, GF, GN, JF, KC, LR, LA, LN, ML, MF, RB, RG, SW, TL, WN, WL
Nasturtium officinale R. Brown		Brassicaceae	BA, BL, CU, DT, DG, EP, GF, GA, GN, JF, KC, LP, LR, LA, ME, MF, PE, RB, SH, SW, WL
Naumburgia thyrsiflora (L.) Reichenbach		Primulaceae	LR
Navarretia breweri (A. Gray) Greene		Polemoniaceae	DT, DL, ME, MF, MZ, MN
Navarretia minima Nuttall	[Navarretia saximontana S.C. Spencer, ined.]	Polemoniaceae	BL, JA, JF, RT
Negundo aceroides (L.) Moench	[Acer negundo L.]	Aceraceae	AA, BL, DT, DV, DG, GF, GA, GN, JF, LP, LA, ME, MF, MZ, MN, OR, PT, PE, RB
Negundo aceroides (L.) Moench subsp. interius (Britton & Shafer) Loeve & Loeve	[Acer negundo L. var. interius (Britton & Shafer) Sargent]	Aceraceae
Negundo aceroides (L.) Moench subsp. violaceus (Kirchner in Petzold & Kirchner) W. A. Weber	[Acer negundo L. var. violaceus Kirchner in Petzold & Kirchner]	Aceraceae
Nemophila breviflora A. Gray		Hydrophyllaceae	EA, GA, GN, MF, RB, RT
Neolepia campestris (L.) W. A. Weber	[Lepidium campestre (L.) R. Brown]	Brassicaceae	BL, DL, GN, JF, LP, LR, ME, MZ, PT, RB, RT
Nepeta cataria L.		Lamiaceae	AH, BL, DT, EP, JF, KC, LP, LR, LO, ME, MF, OR, WL
Nicandra physalodes (L.) Persoon		Solanaceae
Nicotiana attenuata Torrey ex S. Watson		Solanaceae	BL, DT, ME, MF, MZ, MN
Noccaea montana (L.) F. K. Meyer	[Thlaspi montanum L.]	Brassicaceae	AL, AA, BL, CF, CC, CN, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SM, SJ, ST, TL
Nolina texana S. Watson		Nolinaceae	LA
Nothocalais cuspidata (Pursh) Greene		Asteraceae	BA, BL, EL, JF, KC, LR, LA, LO, OT, SW
Notholaena standleyi Maxon		Pteridaceae	BA, LA
Nuphar lutea Sibthorp & Smith subsp. polysepala (Engelmann) Beal		Nymphaeaceae	BL, CN, GF, GA, GN, JA, LP, LR, ME, RT, ST
Nuttallia argillosa (J. Darlington) W. A. Weber	[Mentzelia argillosa J. Darlington]	Loasaceae	GF
Nuttallia chrysantha (Engelmann ex Brandegee) Greene	[Mentzelia chrysantha Engelmann ex Brandegee]	Loasaceae	FN
Nuttallia cronquistii (Thompson & Prigge) W. A. Weber	[Mentzelia cronquistii Thompson & Prigge]	Loasaceae	DL, MZ, MN, SM
Nuttallia decapetala (Pursh ex Sims) Greene	[Mentzelia decapetala (Pursh ex Sims) Urban & Gilg]	Loasaceae	BA, BL, FN, KC, LR, LA, LN, LO, OT, PE, YM
Nuttallia densa (Greene) Greene	[Mentzelia densa Greene]	Loasaceae	FN
Nuttallia humilis (Gray) Rydberg	[Mentzelia humilis (A. Gray) J. Darlington]	Loasaceae	MZ
Nuttallia laciniata (Rydberg) Wooton & Standley	[Mentzelia laciniata (Rydberg) J. Darlington]	Loasaceae	AA, MZ, MN
Nuttallia marginata Osterhout	[Mentzelia marginata (Osterhout) Thompson & Prigge]	Loasaceae	DT, GF, ME, MN
Nuttallia multicaulis (Osterhout) Osterhout	[Mentzelia multicaulis (Osterhout) Goodman]	Loasaceae	EA, GA, KW, ME, MF, RB, ST
Nuttallia multiflora (Nuttall) Greene	[Mentzelia multiflora (Nuttall) A. Gray]	Loasaceae	AL, AA, BA, CC, CN, CT, DV, DG, EA, EL, FN, GF, HF, KW, JF, LP, LR, ML, MZ, MN, OT, PE, RG, SH
Nuttallia nuda (Pursh) Greene	[Mentzelia nuda (Pursh) Torrey & Gray]	Loasaceae	AH, BA, BN, BL, CH, DV, EP, EL, FN, HF, JF, KW, KC, LR, LA, LN, MR, PL, PE, SW, WL, YM
Nuttallia pterosperma (Eastwood) Greene	[Mentzelia pterosperma Eastwood]	Loasaceae	DT, HN, ME, MN, SM
Nuttallia reverchonii (Urban & Gilg) W. A. Weber	[Mentzelia wrightii A. Gray]	Loasaceae	BN, LA, PW
Nuttallia rusbyi (Wooton) Rydberg	[Mentzelia nuda (Pursh) Torrey & Gray var. rusbyi (Wooton) Harrington]	Loasaceae	AA, EA, GF, GA, GN, HF, JA, LP, ML, MZ, PA, TL
Nuttallia sanjuanensis		Loasaceae	MZ, MN
Nuttallia sinuata (Rydberg) Daniels	[Mentzelia sinuata (Rydberg) R.J. Hill]	Loasaceae	BL, LR
Nuttallia speciosa (Osterhout) Greene	[Mentzelia speciosa Osterhout]	Loasaceae	AH, CF, CC, DV, DG, EP, FN, GL, JF, ML, SH, TL
Nymphaea odorata Solander in Aiton		Nymphaeaceae
Oenothera acutissima W. L. Wagner		Onagraceae	MF
Oenothera albicaulis Pursh		Onagraceae	AM, AL, AH, BA, BN, BL, CF, DT, DV, DL, DG, EP, EL, FN, JF, KW, KC, LR, LA, LN, ME, MF, MZ, MN, MR, OT, PW, PE, SH, SM, SW, WL
Oenothera caespitosa Nuttall ex Fraser		Onagraceae	AA, BL, CC, CN, CU, DT, DL, EA, EP, EL, FN, GF, GA, GN, HF, JA, JF, LP, LK, LR, LN, ME, ML, MF, MZ, MN, OT, PA, RB, RG, RT, SH, SM, ST, TL, WL
Oenothera caespitosa Nuttall ex Fraser subsp. caespitosa		Onagraceae
Oenothera caespitosa Nuttall ex Fraser subsp. macroglottis (Rydberg) W. L. Wagner et al.		Onagraceae
Oenothera caespitosa Nuttall ex Fraser subsp. marginata (Nuttall) W. L. Wagner et al.		Onagraceae
Oenothera caespitosa Nuttall ex Fraser subsp. navajoensis W. L. Wagner et al.		Onagraceae
Oenothera canescens Torrey & Fremont		Onagraceae	EL, KW, KC, LN, WL
Oenothera coronopifolia Torrey & Gray		Onagraceae	AL, AA, BL, CF, CH, CN, CT, CU, DV, DG, EP, EL, GN, HF, JF, KC, LP, LK, LR, LA, LN, LO, ME, ML, MF, MZ, MN, PA, PE, RB, RG, RT, SH, SW, TL, WL, YM
Oenothera elata Humboldt, Bonpland, & Kunth subsp. hirsutissima (A. Gray ex S. Watson) Dietrich & Wagner		Onagraceae	AL, BA, CF, CN, CT, DT, DL, GN, HF, LP, LA, ME, ML, MF, MZ, RG, SH, SJ
Oenothera engelmannii (Small) Munz		Onagraceae
Oenothera flava (A. Nelson) Garrett		Onagraceae	AL, EP, GF, GA, GN, JF, LP, LK, ME, MF, MZ, PA, RB, TL
Oenothera grandis (Britton) Smyth		Onagraceae
Oenothera harringtonii W. L. Wagner et al in W. L. Wagner		Onagraceae	EP, FN, HF, LA, OT, PE
Oenothera howardii (A. Nelson) W. L. Wagner		Onagraceae	BL, JF, LR
Oenothera kleinii Wagner & Mill		Onagraceae
Oenothera latifolia (Rydberg) Munz		Onagraceae	BA, BN, CH, EP, EL, KW, KC, LA, LN, LO, MR, PW, SW, WN, WL, YM
Oenothera longissima Rydberg		Onagraceae	DT, MZ
Oenothera nuttallii Sweet		Onagraceae	AM, AH, BL, CC, DG, EP, JA, LR, PA
Oenothera pallida Lindley		Onagraceae	AL, DT, LP, ME, MF, MN, MZ, RB, SH, SM
Oenothera pallida Lindley subsp. pallida		Onagraceae
Oenothera pallida Lindley subsp. runcinata (Engelmann) Munz & Klein		Onagraceae	AL, MZ, SH
Oenothera pallida Lindley subsp. trichocalyx (Nuttall ex Torrey & Gray) Munz & Klein		Onagraceae	DT, ME, MF, MN, RB, SM
Oenothera villosa Thunberg subsp. strigosa (Rydberg) Dietrich & Raven		Onagraceae	AL, AH, BA, BN, BL, CH, CC, CT, CU, DG, EP, GL, GA, GN, HF, JF, KC, LP, LR, LA, LN, LO, ME, MZ, PT, RB, RT, SW, TL, YM
Oligoneuron rigidum (L.) Small	[Solidago rigida L.]	Asteraceae	AA, BL, CU, DG, EP, JF, KC, LR, LA, WL,YM
Oligosporus caudatus (Michaux) Poljakov	[Artemisia caudata Michaux]	Asteraceae	BA, CH, DG, EL, KC, LN, LO, PL, WL, YM
Oligosporus dracunculus (L.) Poljakov	[Artemisia dracunculus L.]	Asteraceae	AL, BA, BL, CH, CN, DT, DL, EP, GF, GL, GA, GN, JA, JF, KC, LR, LA, LN, LO, ME, ML, MF, MZ, MN, OR, PA, RB, RG, RT, SH, SM, SJ, ST, WL
Oligosporus dracunculus (L.) Poljakov subsp. dracunculinus (S. Watson) W. A. Weber	[Artemisia dracunculus L. subsp. dracunculina (S. Wats.) Hall & Clem.]	Asteraceae
Oligosporus dracunculus (L.) Poljakov subsp. glaucus (Pallas) Loeve & Loeve	[Artemisia dracunculus L. subsp. glauca (Pallas ex Willd.) Hall & Clem.]	Asteraceae
Oligosporus filifolius (Torrey) Poljakov	[Artemisia filifolia Torrey]	Asteraceae	BA, BN, BL, CH, CW, EP, KW, KC, LA, LN, LO, MZ, PL, SW, WN, WL, YM
Oligosporus groenlandicus (Hornemann) Loeve & Loeve	[Artemisia spithamaea Pursh]	Asteraceae	AL, BL, CF, CC, DL, GA, GN, HN, LP, LK, LR, PA, PT, SH, ST
Oligosporus pacificus (Nuttall) Poljakov	[Artemisia pacifica Nuttall]	Asteraceae	AH, BL, CF, CT, DG, EP, GL, GA, GN, JA, JF, LK, LR, LA, LN, ME, PA, SH, TL
Oligosporus pedatifidus (Nuttall) Poljakov	[Artemisia pedatifida Nuttall]	Asteraceae	MF
Onobrychis viciifolia Scopoli		Fabaceae	CU, EP, MZ
Onoclea sensibilis L.		Dryopteridaceae	DG
Onopordum acanthium L.		Asteraceae	BL, DG, EL, GF, JF, LP, LA, ME, WL
Onopordum tauricum Willdenow		Asteraceae	HF, PE
Onosmodium molle Michaux subsp. occidentale (Mackenzie) Cochrane		Boraginaceae	BA, BL, DV, JF, LR, LA
Oonopsis engelmannii (A. Gray) Greene		Asteraceae	CH, KW, KC, LA, LN
Oonopsis foliosa (A. Gray) Greene		Asteraceae	BN, CW, HF, KW, LA, OT, PE
Oonopsis puebloensis		Asteraceae	FN, PE
Oonopsis wardii (Gray) Greene		Asteraceae	LR
Opuntia erinacea Engelmann & Bigelow var. erinacea		Cactaceae
Opuntia erinacea Engelmann & Bigelow var. utahensis (Engelmann) L. Benson		Cactaceae
Opuntia fragilis (Nuttall) Haworth		Cactaceae	AA, BA, BL, DL, FN, GF, JA, JF, LO, ME, MF, MZ, MN, SM, ST, WL, YM
Opuntia fragilis (Nuttall) Haworth var. brachyarthra (Engelmann & Bigelow) Coulter		Cactaceae
Opuntia fragilis (Nuttall) Haworth var. fragilis		Cactaceae
Opuntia heacockiae Arp		Cactaceae
Opuntia macrorhiza Engelmann		Cactaceae	BA, BL, CH, DL, DG, EP, FN, JF, KW, KC, LR, LA, LN, LO, MN, PE, SW, WL, YM
Opuntia phaeacantha Engelmann		Cactaceae	AA, BA, BL, EP, FN, JF, LA, ME, MZ, MN
Opuntia phaeacantha Engelmann var. camanchica (Engelmann & Bigelow) L. Benson		Cactaceae
Opuntia phaeacantha Engelmann var. major Engelmann		Cactaceae
Opuntia polyacantha Haworth		Cactaceae	AL, BA, BN, BL, CF, CU, DL, EP, EL, FN, GF, GL, GA, GN, JF, KW, KC, LR, LA, LN, ME, MF, MZ, MN, OR, PE, RB, RT, SM, TL, WL, YM
Opuntia polyacantha Haworth var. polyacantha		Cactaceae
Opuntia polyacantha Haworth var. rufispina (Engelmann) L. Benson		Cactaceae
Oreobatus deliciosus (James ex Torrey) Rydberg	[Rubus deliciosus James ex Torrey]	Rosaceae	AL, BA, BL, CF, CC, CU, DG, EP, EL, FN, GF, GL, JF, LR, LA, ME, PA, PE, SH, TL
Oreobatus deliciosus (James ex Torrey) Rydberg subsp. neomexicanus (Rydberg) Weber		Rosaceae	BA
Oreobroma nevadensis (A. Gray) T. J. Howell	[Lewisia pygmaea (Gray) Robins. var. nevadensis (Gray) Fosberg]	Portulacaceae	AA, DL, LP, ME, MF, MZ, MN
Oreobroma pygmaea (A. Gray) T. J. Howell	[Lewisia pygmaea (A. Gray) B.L. Robinson]	Portulacaceae	BL, CC, CN, DL, EA, GF, GL, GA, GN, HN, HF, LP, LK, LR, ME, MF, MZ, MN, PA, PT, RT, SJ, ST
Oreocarya aperta Eastwood	[Cryptantha aperta (Eastwood) Payson]	Boraginaceae
Oreocarya bakeri Greene	[Cryptantha bakeri (Greene) Payson]	Boraginaceae	AA, DT, GN, ME, MZ, MN, RB, SH
Oreocarya breviflora Osterhout	[Cryptantha breviflora (Osterhout) Payson]	Boraginaceae	MF
Oreocarya caespitosa A. Nelson	[Cryptantha caespitosa (A. Nelson) Payson]	Boraginaceae	MF
Oreocarya cana A. Nelson	[Cryptantha cana (A. Nelson) Payson]	Boraginaceae	KC, LO, WN, WL, YM
Oreocarya celosioides Eastwood	[Cryptantha celosioides (Eastwood) Payson]	Boraginaceae	LO, WL
Oreocarya elata Eastwood	[Cryptantha elata (Eastwood) Payson]	Boraginaceae	DT, ME
Oreocarya flava A. Nelson	[Cryptantha flava (A. Nelson) Payson]	Boraginaceae	DT, GF, ME, MF, MZ, MN, RB
Oreocarya flavoculata A. Nelson	[Cryptantha flavoculata (A. Nelson) Payson]	Boraginaceae	DT, EA, GF, GN, ME, MF, MZ, MN, RB, SM
Oreocarya gypsophila comb. nov. ined.	[Cryptantha gypsophila Reveal & C.R. Broome]	Boraginaceae	ME, MN, SM
Oreocarya humilis Greene subsp. nana (Eastwood) W. A. Weber	[Cryptantha nana (Eastwood) Payson]	Boraginaceae	GF, ME, MZ, RB
Oreocarya longiflora A. Nelson	[Cryptantha longiflora (A. Nelson) Payson]	Boraginaceae	DT, GF, ME, MN
Oreocarya mensana (Jones) Payson	[Cryptantha mensana (Jones) Payson]	Boraginaceae	GF
Oreocarya nitida Greene	[Cryptantha fulvocanescens (A. Gray) Payson]	Boraginaceae	ME, MF, MZ, MN, SM
Oreocarya osterhoutii Payson	[Cryptantha osterhoutii (Payson) Payson]	Boraginaceae	ME
Oreocarya paradoxa A. Nelson	[Cryptantha paradoxa (A. Nelson) Payson]	Boraginaceae	DT, MZ, MN
Oreocarya pustulosa Rydberg	[Cryptantha jamesii (Torrey) Payson var. pustulosa (Rydb.) Harrington]	Boraginaceae	AL, SH
Oreocarya rollinsii (I. M. Johnston) W. A. Weber	[Cryptantha rollinsii I.M. Johnston]	Boraginaceae	RB
Oreocarya sericea (A. Gray) Greene	[Cryptantha sericea (A. Gray) Payson]	Boraginaceae	EA, GF, GA, JA, MF, RT, ST
Oreocarya stricta Osterhout	[Cryptantha stricta (Osterhout) Payson]	Boraginaceae	GF, GA, ME, MF, RB, RT
Oreocarya suffruticosa (Torrey) Greene	[Cryptantha jamesii (Torrey) Payson]	Boraginaceae	AL, AH, AA, BA, BL, CH, DV, DG, EP, FN, GN, KW, KC, LA, LN, MF, OT, PL, PE, RG, SW, WN, WL, YM
Oreocarya thyrsiflora Greene	[Cryptantha thyrsiflora (Greene) Payson]	Boraginaceae	BA, CU, EP, FN, GN, JA, KC, LR, LA, LN, LO, PA, PW, PE, TL, WL
Oreocarya virgata (T. C. Porter) Greene	[Cryptantha virgata (T.C. Porter) Payson]	Boraginaceae	BL, CC, EP, GL, JA, JF, LR, PA, TL
Oreocarya weberi (I. M. Johnston) W. A. Weber	[Cryptantha weberi I.M. Johnston]	Boraginaceae	HN, ML, RG, SH
Oreochrysum parryi (A. Gray) Rydberg	[Haplopappus parryi A. Gray]	Asteraceae	BL, CF, CC, CN, CU, DT, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, ML, MZ, OR, PA, PT, RG, RT, SH, SM, SJ, ST, TL
Oreoxis alpina (A. Gray) Coulter & Rose subsp. alpina		Apiaceae	BL, CC, CU, EA, GL, GA, GN, HN, LK, LR, ML, PA, PT, RB, ST
Oreoxis alpina (A. Gray) Coulter & Rose subsp. puberulenta W. A. Weber		Apiaceae	AA, GN, JA, LA, ML, PA, SH
Oreoxis bakeri Coulter & Rose		Apiaceae	AL, CF, CT, CU, GN, HN, LP, SH, SJ
Oreoxis humilis Rafinesque		Apiaceae	EP
Orobanche ludoviciana Nuttall		Orobanchaceae	BL, CW, EP, KC, LR, LN, ME, MF, MN, PW, WN, WL
Orobanche multiflora Nuttall		Orobanchaceae	CH, LA, LN, MZ, OT
Orobanche multiflora Nuttall var. arenosa (Suksdorf) Munz		Orobanchaceae
Orobanche multiflora Nuttall var. multiflora		Orobanchaceae
Orogenia linearifolia S. Watson		Apiaceae	DL, JA, MZ, MN, RT
Orophaca aretioides (Jones) Rydberg	[Astragalus aretioides (Jones) Barneby]	Fabaceae	MF
Orophaca hyalina (Jones) Isely	[Astragalus hyalinus Jones]	Fabaceae	KC, YM
Orophaca sericea (Nuttall) Britton	[Astragalus sericoleucus A. Gray]	Fabaceae	KC, LN, LO, SW, WN, WL, YM
Orophaca tridactylica (A. Gray) Rydberg	[Astragalus tridactylicus A. Gray]	Fabaceae	BL, JF, LR, WL
Orophaca triphylla Britton	[Astragalus triphyllus Pursh]	Fabaceae	KC, WL
Orthilia secunda (L.) House	[Pyrola secunda L.]	Pyrolaceae	BL, CF, CC, CN, CU, DT, DL, EA, EP, GF, GL, GA, GN, HF, JA, JF, LR, LA, ME, ML, MF, MZ, OR, PA, PT, RB, RT, SH, SM, SJ, ST, TL
Orthocarpus luteus Nuttall		Scrophulariaceae	AL, AH, AA, BL, CN, CT, CU, DL, DG, EP, GF, GL, GA, GN, HF, JA, JF, LR, ME, ML, MF, MZ, MN, PA, PT, RB, RG, RT, SH, SJ, TL
Orthocarpus purpureoalbus A. Gray		Scrophulariaceae	AA, DL, LP, ME, MZ, MN
Oryzopsis asperifolia Michaux		Poaceae	AA, BL, CT, CU, DG, EP, GF, GA, GN, JF, LR, RB, RT, SH
Oryzopsis exigua Thurber		Poaceae	JA, LR, RT
Oryzopsis pungens (Torrey ex Sprengel) A. S. Hitchcock		Poaceae	DG, GA, SH
Osmorhiza chilensis Hooker & Arnott		Apiaceae	BL, DL, DG, EP, GF, GN, JF, MF, RB
Osmorhiza depauperata Philippi		Apiaceae	AA, BL, CN, CU, DT, EA, EP, GF, GL, GN, HF, JA, LA, ME, MF, MZ, MN, PA, PT, RB, RT, SH, SM, SJ, ST, TL
Osmorhiza longistylis (Torrey) De Candolle		Apiaceae	BL, DV, JF, LR, LA, PE
Osmorhiza occidentalis (Nuttall) Torrey		Apiaceae	DT, DL, GF, GN, JA, ME, MZ, MN, PT, RB, RT, SM
Oxalis dillenii Jacquin		Oxalidaceae	AA, BA, BL, EP, JF, KC, LA, ME, PE, TL
Oxalis stricta L.		Oxalidaceae	BL, DV, LR, ME
Oxalis violacea L.		Oxalidaceae	HF, LP, TL
Oxybaphus aggregatus (Ortega) Vahl		Nyctaginaceae	BA
Oxybaphus carletonii (Standley) Weatherby	[Mirabilis carletonii (Standley) Standley]	Nyctaginaceae	BA, LA
Oxybaphus comatus (Small) Weatherby	[Mirabilis comata (Small) Standley]	Nyctaginaceae	AA, LP
Oxybaphus decumbens (Nuttall) Sweet		Nyctaginaceae	BL, CH, KW, KC, LN
Oxybaphus exaltatus (Standley) Weatherby		Nyctaginaceae	BA, BL, LA
Oxybaphus glaber S. Watson	[Mirabilis glabra (S. Wats.) Standley]	Nyctaginaceae	BN, CH, EP, KC, LN, LO, PL, PW, WN, WL, YM
Oxybaphus hirsutus (Pursh) Sweet in De Candolle	[Mirabilis hirsuta (Pursh) MacMillan]	Nyctaginaceae	BL, CU, DG, EP, EL, JF, LR, LA, WL, YM
Oxybaphus linearis (Pursh) B. L. Robinson	[Mirabilis linearis (Pursh) Heimerl]	Nyctaginaceae	AL, AA, BA, BL, CF, CH, CN, CT, DT, EA, EP, EL, GN, HF, JF, KW, KC, LP, LR, LA, LN, ME, ML, MF, MZ, MN, OT, RG, SH, SW, TL, WL
Oxybaphus nyctagineus (Michaux) T. C. Porter in Porter & Coulter	[Mirabilis nyctaginea (Michaux) MacMillan]	Nyctaginaceae	BA, BL, CH, CW, CU, DV, FN, JF, KC, LA, LN, LO, PW, SW
Oxybaphus rotundifolius (Greene) Standley	[Mirabilis rotundifolia (Greene) Standley]	Nyctaginaceae	FN, PE
Oxypolis fendleri (A. Gray) Heller		Apiaceae	AA, BL, CF, CN, CT, CU, DT, DL, EA, GL, GA, GN, HN, HF, JA, LP, LR, ME, ML, MZ, OR, PA, PT, RB, RG, RT, SH, SM, SJ, ST
Oxyria digyna (L.) J. Hill		Polygonaceae	AL, AA, BL, CF, CC, CT, CU, DL, EP, GL, GA, GN, HN, JA, LP, LK, LR, ME, MZ, MN, OR, PA, PT, RB, RT, SH, SM, SJ, ST
Oxytenia acerosa Nuttall		Asteraceae	ME, MZ
Oxytropis besseyi (Rydberg) Blankinship var. obnapiformis (C. L. Porter) Welsh		Fabaceae	MF
Oxytropis campestris (L.) DC	[Oxytropis cusickii; Oxytropis monticola]	Fabaceae	AL, GL, LK, LR, PA, PT
Oxytropis campestris (L.) De Candolle var. cusickii (Greenman) Barneby		Fabaceae
Oxytropis campestris (L.) De Candolle var. gracilis (A. Nelson) Barneby		Fabaceae
Oxytropis deflexa (Pallas) De Candolle subsp. deflexa		Fabaceae	CF, CC, GF, GN, LP, ME, ML, PT, SJ, ST
Oxytropis deflexa (Pallas) De Candolle var. sericea Torrey & Gray		Fabaceae	AA, BL, CC, CN, DT, EA, GL, GN, LP, LR, ML, PA, RG, RT, SH, ST, TL
Oxytropis lambertii Pursh		Fabaceae	AL, AH, BA, BL, CN, CU, DV, DL, DG, EP, FN, GF, GL, GA, HF, JA, JF, KC, LK, LR, LA, LO, ME, ML, PA, RB, RG, SH, SW, TL, YM
Oxytropis lambertii Pursh subsp. bigelovii (A. Gray) W. A. Weber		Fabaceae
Oxytropis lambertii Pursh subsp. lambertii		Fabaceae
Oxytropis multiceps Nuttall		Fabaceae	BL, DG, EP, JF, LR, TL, WL
Oxytropis parryi A. Gray		Fabaceae	AL, BL, CC, PA, SH
Oxytropis podocarpa A. Gray		Fabaceae	CF, CC, GN, HN, LK, PA, PT, ST
Oxytropis sericea Nuttall		Fabaceae	AL, BL, CH, CN, CT, CU, DL, EP, EL, GA, HF, JA, JF, KW, LK, LR, LA, LN, LO, ME, MF, PA, SW, ST, TL, WL, YM
Oxytropis splendens Douglas ex Hooker		Fabaceae	AL, BL, CF, CC, GL, GA, HN, JA, LK, ML, PA, SH, ST, TL
Oxytropis viscida Nuttall ex Torrey & Gray		Fabaceae	GN, PA, PT, ST
Packera cana (Hooker) Weber & Loeve	[Senecio canus Hooker]	Asteraceae	BL, CF, GF, GL, GN, GA, LK, LR, LO, MF, PA, PT, RT, SH, SJ, ST, TL
Packera crocata (Rydberg) Weber & Loeve	[Senecio crocatus Rydberg]	Asteraceae	AL, BL, CF, CC, GA, GN, JA, LK, LR, ME, MN, PA, PT, SH, SJ, ST
Packera debilis (Nuttall) Weber & Loeve	[Senecio debilis Nuttall]	Asteraceae	JA, LR, PA
Packera dimorphophylla (Greene) Weber & Loeve	[Senecio dimorphophyllus Greene]	Asteraceae	BL, CF, CC, CU, EA, GF, GL, GA, GN, HN, JA, LR, ME, ML, MN, OR, PA, PT, RT, SH, SJ, ST, TL
Packera dimorphophylla (Greene) Weber & Loeve subsp. intermedia (T. Barkley) Weber & Loeve	[Senecio tracyi Rydberg]	Asteraceae	ME, ML, MN
Packera dimorphophylla (Greene) Weber & Loeve var. dimorphophylla	[Senecio dimorphophyllus Greene]	Asteraceae
Packera fendleri (A. Gray) Weber & Loeve	[Senecio fendleri A. Gray]	Asteraceae	AL, BL, CF, CC, CU, DG, EA, EP, GL, GA, GN, HF, JA, JF, LK, LR, LA, ML, PA, PT, PE, RB, SH, ST, TL, WL
Packera multilobata (Torrey & Gray ex A. Gray) Weber & Loeve	[Senecio multilobatus Torrey & Gray ex A. Gray]	Asteraceae	DT, DL, EA, GF, GA, GN, ME, MF, MZ, MN, RB, RT, SM
Packera neomexicana (A. Gray) Weber & Loeve	[Senecio neomexicanus A. Gray]	Asteraceae	AA, CF, CN, CU, DT, DL, DG, EP, GA, GN, HN, LP, LK, ME, ML, MZ, MN, PA, PE, RG, SH, SM, SJ, ST, TL, WL
Packera oodes (Rydberg) W. A. Weber	[Senecio oodes Rydberg]	Asteraceae	AA, GN, HN, LP, PA, SM, SJ
Packera pauciflora (Pursh) Loeve & Loeve	[Senecio pauciflorus Pursh]	Asteraceae	PA
Packera paupercula (Michaux) Loeve	[Senecio pauperculus Michaux]	Asteraceae	JA, PA
Packera plattensis (Nuttall) Weber & Loeve	[Senecio plattensis Nuttall]	Asteraceae	BA, BL, JF, LR, LA, PW, WL, YM
Packera pseudaurea (Rydberg) Weber & Loeve	[Senecio pseudaureus Rydberg]	Asteraceae	AL, AA, BL, CT, CU, EA, EP, GA, GN, HF, JA, LP, ML, PA, RB, RG, RT, SH, TL
Packera pseudaurea (Rydberg) Weber & Loeve subsp. flavula (Greene) Weber & Loeve	[Senecio flavulus Greene]	Asteraceae
Packera pseudaurea (Rydberg) Weber & Loeve subsp. pseudaurea	[Senecio pseudaureus Rydberg]	Asteraceae
Packera streptanthifolia (Greene) Weber & Loeve	[Senecio streptanthifolius Greene]	Asteraceae	CU, EA, GF, GA, GN, HN, LK, ME, MF, PT, RT, SH
Packera tridenticulata (Rydberg) Weber & Loeve	[Senecio tridenticulatus Rydberg]	Asteraceae	AL, BA, BL, CF, CH, CU, DT, DG, EP, EL, FN, GN, HN, HF, JF, KW, KC, LK, LA, LR, LN, LO, ML, MR, PA, PE, RG, SH, TL, WN, WL, YM
Packera werneriifolia (A. Gray) Weber & Loeve	[Senecio werneriifolius (A. Gray) A. Gray]	Asteraceae	AL, BL, CF, CC, CU, DT, DL, EA, EP, GF, GA, GN, HN, LK, LP, LR, MF, MZ, OR, PA, PT, RB, RT, SH, SM, SJ, ST, TL
Padus virginiana (L.) P. Miller subsp. melanocarpa (A. Nelson) W. A. Weber	[Prunus virginiana L. var. melanocarpa (Nel.) Sargent]	Rosaceae	AL, AH, AA, BA, BL, CF, CC, CU, DT, DV, DG, DL, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LR, LA, LO, ME, ML, MF, MZ, MN, PA, PL, PT, PE, RB, RG, RT, SH, SJ, ST, TL, WL
Palafoxia rosea (Bush) Cory var. macrolepis (Rydberg) B. Turner		Asteraceae	BA, BN, LA
Palafoxia sphacelata (Nuttall ex Torrey) Cory		Asteraceae	BA, BN, CH, EP, JF, KC, LA, LN, PL, SW, WL, YM
Panicum capillare L.		Poaceae	AM, BA, BN, BL, CH, DT, EP, GN, HN, JF, KW, KC, LR, LA, LN, LO, ME, MF, MZ, MR, OT, PW, PE, RT, SW, WN, WL, YM
Panicum dichotomiflorum Michaux		Poaceae	DV, JF
Panicum hallii Vasey		Poaceae	CH, LA
Panicum hillmanii Chase		Poaceae	BA, PW
Panicum miliaceum L.		Poaceae	BL, CH, DV, LO, ME, MR
Panicum obtusum Humboldt, Bonpland, & Kunth		Poaceae	BA, BN, CW, KW, LA, LN, OT
Panicum virgatum L.		Poaceae	AH, BA, BN, BL, CH, DT, DV, EP, EL, JF, KW, KC, LR, LA, LN, LO, ME, MN, PL, SM, SW, WN, WL, YM
Papaver croceum Ledebour		Papaveraceae	GN, PA
Papaver kluanense D. Loeve		Papaveraceae	BL, CF, CC, CT, EP, GL, GA, GN, LP, LK, PA, ST
Papaver orientale L.		Papaveraceae	RT
Parietaria pensylvanica Muhlenberg ex Willdenow		Urticaceae	BA, BL, DG, FN, GF, GN, JF, LR, LA, MN, PA, RT, SH, TL
Parnassia fimbriata Konig		Parnassiaceae	BL, CC, DT, DL, GF, GL, GA, GN, JA, LP, LR, MZ, OR, PA, RT, SH, SJ, ST
Parnassia kotzebuei Chamisso & Schlechtendal		Parnassiaceae	BL, CC, GA, LR, SJ, ST
Parnassia parviflora De Candolle		Parnassiaceae	AA, BL, CC, CT, CU, DT, DG, EP, GA, GN, LP, LA, MF, PA
Paronychia jamesii Torrey & Gray		Alsinaceae	BA, BL, EP, GN, JF, LR, LA, LO, OT, SW, WL, YM
Paronychia pulvinata A. Gray		Alsinaceae	BL, CF, CC, GL, GA, GN, JA, LK, LR, LO, PA, PT, RT, SH, ST
Paronychia sessiliflora Nuttall		Alsinaceae	CN, CT, EP, FN, GA, GN, JA, KC, LR, ML, MF, OT, PE, SH, SM, TL, WN, WL, YM
Parryella filifolia Torrey & Gray		Fabaceae	MZ
Parthenocissus quinquefolia (L.) Planchon		Vitaceae	BL
Parthenocissus vitacea (Knerr) Hitchc.	[Parthenocissus inserta (Kerner) Fritsch]	Vitaceae	BA, BL, DT, DG, EP, JF, LA, LN, LO, ME, MF, MZ
Pascopyrum smithii (Rydberg) Loeve	[Agropyron smithii Rydberg]	Poaceae	AM, AL, AH, AA, BA, BL, CF, CH, CN, CT, CU, DT, DV, DL, DG, EP, EL, GF, GL, GA, GN, JA, JF, KW, KC, LP, LK, LR, LA, LN, LO, ME, ML, MF, MZ, MN, OT, PA, PW, PE, RB, RG, RT, SH, SW, ST, TL, WL, YM
Paspalum dilatatum Poiret		Poaceae
Paspalum pubiflorum Ruprecht ex Fournier var. glabrum Vasey & Scribner		Poaceae	BL
Paspalum racemosum Lamarck		Poaceae	AH
Paspalum setaceum Michaux var. stramineum (Nash) D. Banks		Poaceae	BA, BN, CH, DV, KC, LN, LO, PL, SW, WN, YM
Pastinaca sativa L.		Apiaceae	BL, PT, RG
Paxistima myrsinites (Pursh) Rafinesque		Celastraceae	AA, BL, CC, CT, DT, DL, EA, GF, GA, GN, HF, JA, LP, LR, LA, ME, ML, MF, MZ, MN, OR, PT, RB, RT, SM, SJ, ST
Pectis angustifolia Torrey		Asteraceae	BA, CN, CW, EP, FN, LP, LA, LN, LO, WL
Pedicularis bracteosa Bentham in Hooker subsp. paysoniana (Pennell) W. A. Weber		Scrophulariaceae	BL, CF, CC, DT, DL, EA, GF, GA, GN, HN, JA, LK, LR, ME, MZ, MN, OR, PT, RT, SM, SJ, ST
Pedicularis canadensis L. subsp. fluviatilis (Heller) W. A. Weber		Scrophulariaceae	CT, CU, DG, EP, HF, JF, LA, TL
Pedicularis centranthera A. Gray		Scrophulariaceae	DT, GF, ME, MZ, MN
Pedicularis crenulata Bentham in De Candolle		Scrophulariaceae	CC, CT, CU, GA, GN, JA, LK, LR, PA, SH, TL
Pedicularis groenlandica Retzius		Scrophulariaceae	AL, BL, CC, CN, CT, CU, DT, DL, DG, EA, EP, FN, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, MZ, OR, PA, PT, RT, SH, SM, SJ, ST
Pedicularis parryi A. Gray		Scrophulariaceae	AL, BL, CF, CC, CU, DL, EA, EP, GF, GL, GA, GN, HN, HF, LP, LK, LR, ME, ML, OR, PA, PT, SH, SJ, ST
Pedicularis parryi A. Gray subsp. mogollonica (Greene) Carr		Scrophulariaceae
Pedicularis parryi A. Gray subsp. parryi		Scrophulariaceae
Pedicularis procera A. Gray		Scrophulariaceae	BL, CC, CN, CU, DT, EP, GF, GL, GN, HF, JF, LP, LR, LA, ME, ML, MZ, MN, PA, PT, RB, RT, SH, SM, SJ, TL
Pedicularis racemosa Douglas ex Hooker subsp. alba Pennell		Scrophulariaceae	AA, BL, CC, DT, DL, GF, GL, GA, GN, HN, HF, JA, LR, ME, ML, MZ, MN, OR, PA, PT, RT, SH, SM, SJ, ST
Pedicularis scopulorum A. Gray		Scrophulariaceae	BL, CC, GA, GN, HN, HF, LK, LR, OR, PA, PT, ST
Pediocactus simpsonii (Engelmann) Britton & Rose		Cactaceae	BL, CF, CC, DL, DG, EA, GF, GL, GA, GN, JA, JF, LR, ML, MF, MN, OR, PA, RB, RT, SM, ST, TL
Pediocactus simpsonii (Engelmann) Britton & Rose var. minor (Engelmann) Cockerell		Cactaceae
Pediocactus simpsonii (Engelmann) Britton & Rose var. simpsonii		Cactaceae
Pediomelum aromaticum (Payson) W. A. Weber	[Psoralea aromatica Payson]	Fabaceae	ME, MN
Pediomelum cuspidatum (Pursh) Rydberg	[Psoralea cuspidata Pursh]	Fabaceae
Pediomelum esculentum (Pursh) Rydberg	[Psoralea esculenta Pursh]	Fabaceae	AH, KC, WL
Pediomelum hypogaeum (Nuttall ex Torrey & Gray) Rydberg	[Psoralea hypogaea Nuttall ex Torrey & Gray]	Fabaceae	BA, CH, EP, LA, WL
Pediomelum megalanthum (Wooton & Standley) Rydberg	[Psoralea megalantha Wooton & Standley]	Fabaceae	DT, ME, MZ, MN, SM
Peganum harmala L.		Zygophyllaceae	LA
Pellaea atropurpurea (L.) Link		Pteridaceae	BA, EP, LR, LA, ME, SM
Pellaea breweri D. C. Eaton		Pteridaceae	GF, MF
Pellaea glabella Mettenius ex Kuhn		Pteridaceae	GF, LA, MF, MZ
Pellaea glabella Mettenius ex Kuhn subsp. simplex (Butters) Loeve & Loeve		Pteridaceae
Pellaea truncata Goodding		Pteridaceae	FN
Pellaea wrightiana Hooker		Pteridaceae	BA, BL, LA
Pennellia micrantha (A. Gray) Nieuwland		Brassicaceae	LP
Pennisetum setaceum (Forskal) Chiovenda		Poaceae
Pennisetum villosum R. Brown		Poaceae
Penstemon acaulis L. Williams var. yampaensis (Penland) Neese		Scrophulariaceae	MF
Penstemon albidus Nuttall		Scrophulariaceae	AH, BA, CH, DV, EP, EL, JF, KC, LA, LN, LO, MR, PW, SW, WN, WL, YM
Penstemon albifluvis England		Scrophulariaceae	RB
Penstemon angustifolius Nuttall ex Pursh		Scrophulariaceae	AH, BA, BL, CU, EP, EL, FN, GL, HF, JF, KC, LR, LA, LN, LO, MZ, OT, PW, PE, SW, WL, YM
Penstemon angustifolius Nuttall ex Pursh subsp. angustifolius		Scrophulariaceae
Penstemon angustifolius Nuttall ex Pursh subsp. caudatus (Heller) Keck		Scrophulariaceae
Penstemon angustifolius Nuttall var. vernalensis N. Holmgren		Scrophulariaceae
Penstemon arenicola A. Nelson		Scrophulariaceae	MF
Penstemon auriberbis Pennell		Scrophulariaceae	CU, EP, FN, HF, KW, LA, OT, PE
Penstemon barbatus (Cavanilles) Roth subsp. torreyi (Bentham in De Candolle) Keck		Scrophulariaceae
Penstemon barbatus Torrey		Scrophulariaceae	AL, AA, CF, CN, CT, CU, EP, FN, GF, GN, HF, LP, LA, ML, MZ, MN, PA, RG, SH, SM, TL
Penstemon barbatus Torrey subsp. trichander (A. Gray) Keck		Scrophulariaceae
Penstemon brandegei (T. C. Porter) T. C. Porter ex Rydberg		Scrophulariaceae	CU, LA
Penstemon breviculus (Keck) Nisbet & Jackson		Scrophulariaceae	MZ, MN, SM
Penstemon bridgesii A. Gray	[Penstemon rostriflorus Kellogg]	Scrophulariaceae	DL, LP, MZ
Penstemon buckleyi Pennell		Scrophulariaceae	CH, KC, LN, OT, YM
Penstemon caespitosus Nuttall ex A. Gray		Scrophulariaceae	AL, AA, CF, CN, CT, CU, DT, DL, EA, FN, GF, GA, GN, HN, LP, LK, ME, ML, MF, MZ, MN, PA, RB, RG, RT, SH, SM, ST, TL
Penstemon cobaea Nuttall		Scrophulariaceae	LA
Penstemon comarrhenus A. Gray		Scrophulariaceae	AA, GF, LP, ME, MZ, MN, SM
Penstemon confertus Douglas in Lindley subsp. procerus (Douglas ex R. Graham) D. Clark		Scrophulariaceae	BL, CF, EP, GF, GL, GA, LK, LR, MF, PA, SH, ST
Penstemon crandallii A. Nelson subsp. atratus Keck		Scrophulariaceae
Penstemon crandallii A. Nelson subsp. procumbens (Greene) Keck		Scrophulariaceae
Penstemon cyanocaulis Payson		Scrophulariaceae	ME, MN, SM
Penstemon cyathophorus Rydberg		Scrophulariaceae	GA, JA, ST
Penstemon debilis O'Kane & Anderson		Scrophulariaceae	GF
Penstemon degeneri Crosswhite		Scrophulariaceae	FN
Penstemon eatonii A. Gray		Scrophulariaceae	MZ, MN
Penstemon eatonii A. Gray subsp. eatonii		Scrophulariaceae
Penstemon eatonii A. Gray subsp. undosus (Jones) Keck		Scrophulariaceae
Penstemon eriantherus Pursh		Scrophulariaceae	WL
Penstemon fendleri A. Gray		Scrophulariaceae	AA
Penstemon fremontii Torrey & Gray		Scrophulariaceae	GF, MF, RB
Penstemon fremontii Torrey & Gray var. fremontii		Scrophulariaceae
Penstemon fremontii Torrey & Gray var. glabrescens Dorn & Lichvar		Scrophulariaceae
Penstemon gibbensii Dorn		Scrophulariaceae
Penstemon glaber Pursh var. glaber		Scrophulariaceae	BL, CC, DV, DG, EP, GL, GA, JF, LR, PA, PE
Penstemon gracilis Nuttall		Scrophulariaceae	BL, DG, EP, LA, PE
Penstemon grahamii Keck ex E. Graham		Scrophulariaceae	RB
Penstemon grandiflorus Nuttall		Scrophulariaceae	YM
Penstemon gratus Umber & Moorman, ined. (see P. mensarum)		Scrophulariaceae	GN
Penstemon griffinii A. Nelson		Scrophulariaceae	CF, CN, FN, ML, RG, SH
Penstemon hallii A. Gray		Scrophulariaceae	CF, CC, CU, EP, HN, JA, LK, ML, PA, PT, SH, ST
Penstemon harbourii A. Gray		Scrophulariaceae	CF, CC, DL, EA, GA, GN, HN, LP, OR, PA, PT, SM, SJ, ST
Penstemon harringtonii Penland		Scrophulariaceae	EA, GA, ST
Penstemon humilis Nuttall ex A. Gray		Scrophulariaceae	MF
Penstemon jamesii Bentham		Scrophulariaceae	LA
Penstemon laricifolius Hooker & Arnott subsp. exilifolius (A. Nelson) Keck		Scrophulariaceae	LR
Penstemon lasiostemon Umber & Moorman, ined.		Scrophulariaceae	MF
Penstemon lentus Pennell		Scrophulariaceae	AA, LP, MZ, MN, SM
Penstemon linarioides A. Gray		Scrophulariaceae	DL, LP, MZ, SM
Penstemon mensarum Pennell		Scrophulariaceae	DT, GN, ME
Penstemon moffatii Eastwood		Scrophulariaceae	GF, ME, MN
Penstemon nitidus Douglas ex Bentham in DeCandolle		Scrophulariaceae
Penstemon ophianthus Pennell		Scrophulariaceae	LP, MZ, MN, SM
Penstemon osterhoutii Pennell		Scrophulariaceae	EA, GF, RB, RT
Penstemon pachyphyllus A. Gray ex Rydberg var. mucronatus (N. Holmgren) Neese		Scrophulariaceae	MF, RB
Penstemon parviflorus Pennell		Scrophulariaceae
Penstemon penlandii W. A. Weber		Scrophulariaceae	GA
Penstemon radicosus A. Nelson		Scrophulariaceae	JA, MF
Penstemon retrorsus Payso ex Pennell		Scrophulariaceae	DT, MN
Penstemon rostriflorus Kellogg (see Penstemon bridgesii)		Scrophulariaceae
Penstemon rydbergii A. Nelson		Scrophulariaceae	AA, CF, CC, DT, GF, GL, GA, GN, HN, JA, LK, LR, ME, ML, MF, MZ, PA, PT, RT, SH, ST, TL
Penstemon saxosorum Pennell		Scrophulariaceae	EA, GF, JA, MF, RB, RT
Penstemon scariosus Pennell		Scrophulariaceae	MF
Penstemon scariosus Pennell var. albifluvis (England) N. Holmgren		Scrophulariaceae
Penstemon scariosus Pennell var. cyanomontanus Neese		Scrophulariaceae
Penstemon secundiflorus Bentham in De Candolle		Scrophulariaceae	BL, CF, CC, DV, DG, EP, EL, FN, GL, JA, JF, LK, LR, ML, PA, RG, SH, TL
Penstemon strictus Bentham in De Candolle		Scrophulariaceae	AL, AA, BL, CF, CN, CT, DT, DL, EA, GF, GA, GN, HN, HF, JA, JF, LP, LK, ME, ML, MF, MZ, MN, OR, PT, RB, RG, RT, SH, SM, ST
Penstemon utahensis Eastwood		Scrophulariaceae	ME, MZ
Penstemon versicolor Pennell		Scrophulariaceae	FN, LA, OT, PE
Penstemon virens Pennell ex Rydberg		Scrophulariaceae	BL, CC, CU, DG, EP, EL, FN, GL, GA, JA, JF, LR, PA, PE, TL
Penstemon virgatus A. Gray subsp. asa-grayi Crosswhite		Scrophulariaceae	AL, BL, CN, CT, CU, DG, EP, EL, HF, JF, LK, LR, PA, SH, TL, WL
Penstemon watsonii A. Gray		Scrophulariaceae	EA, GF, GA, ME, MF, MN, RB, RT, ST
Penstemon whippleanus A. Gray		Scrophulariaceae	AL, BL, CF, CC, CU, DT, DL, EP, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, MF, MZ, OR, PA, PT, RB, RT, SH, SM, SJ, ST, TL
Pentaphylloides floribunda (Pursh) Loeve	[Potentilla fruticosa L.]	Rosaceae	AL, AA, BL, CC, CN, CT, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, ME, ML, MF, MZ, MN, PA, PT, RB, RG, RT, SH, SM, SJ, ST, TL
Peraphyllum ramosissimum Nuttall ex Torrey & Gray		Rosaceae	AA, DT, GF, GN, LP, ME, MZ, MN, RB, SM
Pericome caudata A. Gray var. caudata		Asteraceae	AA, BL, CC, CN, DG, EP, JF, LA, ML, SH
Pericome caudata A. Gray var. glandulosa (Goodman) Harrington		Asteraceae	BA, LA
Perideridia gairdneri (Hooker & Arnott) Mathias subsp. borealis Chuang & Constance		Apiaceae	MF, RB, RT
Persicaria amphibia (L.) S. Gray	[Polygonum amphibium L. var. stipulaceum (Coleman) Fernald]	Polygonaceae	AL, AA, BL, DL, GL, GA, GN, JA, LR, MF, MN, PA, RB, RT, SJ
Persicaria bicornis (Rafinesque) Nieuwland	[Polygonum bicorne Rafinesque]	Polygonaceae	BA, CH, KC, LA, LN, SW, WL
Persicaria coccinea (Mühlenberg ex Willdenow) Greene	[Polygonum coccineum Muhlenberg ex Willdenow]	Polygonaceae	AL, BL, KW, KC, LR, LA, LO, MF, MZ, RT, WL
Persicaria hydropiper (L.) Opiz	[Polygonum hydropiper L.]	Polygonaceae	BA, BL, JF
Persicaria lapathifolia (L.) S. Gray	[Polygonum lapathifolium L.]	Polygonaceae	AH, BA, BL, CH, CU, DG, EL, GN, JF, KW, KC, LP, LR, LA, LN, LO, ME, MF, MR, MZ, OT, PL, SW, TL, WL
Persicaria maculata (L.) S. Gray	[Polygonum persicaria L.]	Polygonaceae	AL, AH, AA, BL, CN, DT, DG, EP, GN, JF, LP, LR, LA, LO, ME, MZ, RG, SH, TL, WL, YM
Persicaria pensylvanica (L.) Gomez	[Polygonum pensylvanicum L. var. laevigatum Fernald]	Polygonaceae	BA, BL, CH, EP, EL, JF, LA, LO, MZ, SH, WL
Persicaria punctata (Elliott) Small	[Polygonum punctatum Elliott]	Polygonaceae	BA
Petasites sagittatus (Banks ex Pursh) A. Gray		Asteraceae	BL, CC, GN, JA, ML, PA
Petradoria pumila (Nuttall) Greene		Asteraceae	GF, GN, LP, ME, MF, MZ, MN, RB
Petrophyton caespitosum (Nuttall) Rydberg		Rosaceae	GF, GN, MF, MN
Phacelia alba Rydberg		Hydrophyllaceae	AL, CF, CC, CN, CT, CU, GN, HF, LR, LA, ML, PA, RB, SH, TL, WL
Phacelia bakeri (Brand) Macbride		Hydrophyllaceae	CF, CN, CT, DG, HN, LP, MN, TL
Phacelia constancei Atwood		Hydrophyllaceae	SM
Phacelia crenulata Torrey		Hydrophyllaceae	DT, GF, ME, MF, MZ, MN, SM
Phacelia demissa A. Gray		Hydrophyllaceae	MZ, RB
Phacelia denticulata Osterhout		Hydrophyllaceae	BL, CC, DG, EP, LR, LA, PA
Phacelia formosula Osterhout		Hydrophyllaceae	JA
Phacelia glandulosa Nuttall		Hydrophyllaceae	GF, HN, ML, OR, RB, SH, SJ
Phacelia hastata Douglas ex Lehmann		Hydrophyllaceae	BL, CF, EP, GF, GA, GN, JF, LR, MF, MZ, PA, PT, RB, RT, WL
Phacelia heterophylla Pursh		Hydrophyllaceae	AA, BL, CF, CC, CN, CT, CU, DV, DL, DG, EA, EP, FN, GF, GL, GA, GN, HF, JA, JF, LP, LR, ME, MZ, PA, PT, RB, RT, SM, TL
Phacelia incana Brand		Hydrophyllaceae	RB
Phacelia integrifolia Torrey		Hydrophyllaceae	MZ
Phacelia ivesiana Torrey		Hydrophyllaceae	DT, ME, MF, MZ, RB
Phacelia sericea (R. Graham) A. Gray		Hydrophyllaceae	AA, BL, CF, CC, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, JA, LP, LK, LR, ME, ML, MF, MZ, OR, PA, PT, RB, RT, SH, SM, SJ, ST
Phacelia sericea (R. Graham) A. Gray subsp. ciliosa (Rydberg) G. W. Gillett		Hydrophyllaceae	MF, RB
Phacelia sericea (R. Graham) A. Gray subsp. sericea		Hydrophyllaceae
Phacelia splendens Eastwood		Hydrophyllaceae	DT, ME, MZ, MN
Phacelia submutica J. T. Howell		Hydrophyllaceae	GF, ME
Phacelia tanacetifolia Bentham		Hydrophyllaceae	BL
Phalaris canariensis L.		Poaceae	BL, OT
Phalaris caroliniana Walter		Poaceae	BA
Phalaris minor Retzius		Poaceae
Phalaroides arundinacea (L.) Rauschert	[Phalaris arundinacea L.]	Poaceae	AM, BL, DT, DG, EA, GF, GL, GA, GN, JA, JF, LP, LR, LN, ME, MZ, MN, RB, RT, TL
Phegopteris connectilis (Michaux) Watt		Thelypteridaceae	GN
Philadelphus microphyllus A. Gray		Hydrangeaceae	FN, GF, GN, LA, ME, MF, MZ, MN
Phippsia algida (Phipps) R. Brown		Poaceae	BL, CC, PA, ST
Phleum commutatum Gaudin	[Phleum alpinum L.]	Poaceae	AA, BL, CF, CC, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, MZ, MN, PA, PT, RB, RG, RT, SH, SJ, ST
Phleum pratense L.		Poaceae	AA, BL, CN, CU, DL, EA, EP, GF, GL, GA, GN, JA, JF, LP, ME, ML, MF, MZ, MN, PA, PT, RB, RT, SH, SM, SJ, TL YM
Phlox andicola (Nuttall ex Torrey & Gray) E. Nelson		Polemoniaceae	KC, LN, LO, MR, WN, WL, YM
Phlox austromontana Coville		Polemoniaceae	DL, LP, MF, MZ, MN, RB
Phlox bryoides Nuttall	[Phlox muscoides Nuttall]	Polemoniaceae	JA, LR, LO, MF, WL
Phlox caryophylla Wherry		Polemoniaceae	AA
Phlox condensata (A. Gray) E. Nelson		Polemoniaceae	AL, CF, CC, CU, DL, GN, HN, LP, LK, PA, SH, SJ
Phlox hoodii Richardson		Polemoniaceae	DL, EA, EL, GF, GA, GN, JA, LP, LN, ME, MF, MZ, MN, RB, RT, SH, WL
Phlox longifolia Nuttall		Polemoniaceae	AA, DT, DL, EA, GF, GN, HF, JF, LP, ME, MF, MZ, MN, OT, RB, RT, SM
Phlox multiflora A. Nelson		Polemoniaceae	BL, CU, EA, GF, GA, GN, JA, ME, MF, MN, RB, RT, ST
Phlox sibirica L. subsp. pulvinata (Wherry) W. A. Weber		Polemoniaceae	BL, CN, HN, HF, LP, LR, PA, SH, ST
Phoradendron juniperinum Engelmann		Viscaceae	AA, LP, ME, MZ, MN, SM
Phragmites australis (Cavanilles) Trinius ex Steudel		Poaceae	AM, BN, BL, CF, DT, JF, LR, LA, LO, ME, MF, MZ, MN, PT, SM, SW
Phyla cuneifolia (Torrey) Greene		Verbenaceae	AH, BA, BN, BL, CH, CW, JF, KW, KC, LR, LA, LN, OT, PW, PE, WL
Phyla lanceolata (Michaux) Greene		Verbenaceae	LA, YM
Physalis foetens Poiret var. neomexicana (Rydberg) Waterfall		Solanaceae	LA
Physalis hederifolia A. Gray		Solanaceae	AA, BA, BN, CH, DV, EP, EL, FN, HF, JF, KC, LP, LA, LN, LO, ME, MZ, OT, WL
Physalis hederifolia A. Gray var. comata (Rydberg) Waterfall		Solanaceae
Physalis hederifolia A. Gray var. cordifolia (A. Gray) Waterfall		Solanaceae
Physalis heterophylla Nees		Solanaceae	BL, EP, JF, LR
Physalis pruinosa L.		Solanaceae
Physalis pumila Nuttall subsp. hispida (Waterfall) Hinton		Solanaceae	BA, BL, CH, CW, EP, KW, KC, LA, LN, LO, PL, SW, WN, WL, YM
Physalis virginiana P. Miller		Solanaceae	AH, BA, BN, BL, CH, DT, DV, EP, GN, JF, KW, KC, LR, LA, LO, ME, MZ, MN, OT, SW, WL, YM
Physaria acutifolia Rydberg		Brassicaceae	DT, LP, LR, ME, MF, MZ, MN, RB, RT, SM
Physaria alpina Rollins		Brassicaceae	GN, LK, PA, PT
Physaria bellii Mulligan		Brassicaceae	BL, JF, LR
Physaria floribunda Rydberg		Brassicaceae	DT, EA, FN, GF, GA, GN, HN, ME, ML, MN, SH
Physaria obcordata Rollins		Brassicaceae	RB
Physaria osterhoutii Payson		Brassicaceae	GA, RT, ST
Physaria pulvinata O'Kane & Reveal		Brassicaceae	DL, SM
Physaria rollinsii Mulligan		Brassicaceae	GN
Physaria vitulifera Rydberg		Brassicaceae	BL, DV, DG, EP, GL, JF, PA
Physocarpus alternans (Jones) J. T. Howell		Rosaceae	ME, MF
Physocarpus monogynus (Torrey) Coulter		Rosaceae	AL, BL, CC, CU, DG, EP, GN, HF, JF, LR, LA, PE, SH, TL, WL
Physocarpus opulifolius (L.) Maximovicz		Rosaceae	BL, EP, JF, LR, LA, PE
Picea engelmannii Parry ex Engelmann		Pinaceae	AL, BL, CU, DG, GL, GA, GN, HN, JA, LR, OR, PT, RB, RT, SJ, ST
Picea pungens Engelmann		Pinaceae	AA, BL, CF, CN, GF, GA, GN, LP, LR, ML, MF, MN, PA, PT, RG, SM, SJ, ST, TL
Picradenia helenioides Rydberg	[Hymenoxys helenioides (Rydberg) Cockerell]	Asteraceae	CT, HN, PA
Picradenia odorata (De Candolle) Britton	[Hymenoxys odorata De Candolle]	Asteraceae	BA, BN, KW, LN, OT, PW
Picradenia richardsonii Hooker	[Hymenoxys richardsonii (Hooker) Cockerell]	Asteraceae	AL, CF, CN, CT, CU, EL, GA, GN, HN, HF, JA, JF, LP, LK, ME, ML, MF, MZ, PA, RG, SH, TL, WN
Picradeniopsis oppositifolia (Nuttall) Rydberg	[Bahia oppositifolia (Nuttall) De Candolle]	Asteraceae	AM, AL, AH, BA, BL, CH, CW, DV, EP, EL, HF, JF, KW, KC, LR, LA, LN, OT, PW, PE, WL
Picradeniopsis woodhousei (A. Gray) Rydberg	[Bahia woodhousei A. Gray]	Asteraceae	BA, EL, LN, WN
Picrothamnus desertorum Nuttall	[Artemisia spinescens D.C. Eaton]	Asteraceae	DT, ME, MF, MZ, MN, RB
Pinus aristata Engelmann		Pinaceae	BL, CF, CC, CN, CT, CU, GA, GN, HN, HF, LK, ML, PA, RG, SH, ST, TL
Pinus contorta Douglas ex Loudon var. latifolia Engelmann		Pinaceae	BL, CC, DG, GL, JA, LK, LR, MZ, MN, PA, RT
Pinus edulis Engelmann		Pinaceae	AA, BA, BL, CF, CN, CT, DT, EP, FN, GA, LP, LR, LA, ME, MF, MZ, MN, PE, RB, RG, RT, SH, SM, TL
Pinus flexilis James		Pinaceae	BL, CF, CC, CU, DG, GF, GL, GA, GN, HF, JA, LP, LR, ML, MF, MZ, OR, PA, PE, RG, SH, SJ, ST, TL, WL
Pinus ponderosa Douglas ex P. & C. Lawson subsp. scopulorum (S. Watson) W. A. Weber		Pinaceae	BA, BL, CF, CC, CT, CU, DG, EA, EL, JF, LP, LR, LA, ME, ML, MF, MZ, MN, PE, RB, RG, RT, SH, TL
Pinus strobiformis Engelmann		Pinaceae	AA, CU, FN, LP, MZ, PA, SH
Piperia unalascensis (Sprengel) Rydberg		Orchidaceae	BL, DL, EA, JA, LR, MF, MN, PT, RT
Piptatherum micranthum (Trinius & Ruprecht) Barkworth	[Oryzopsis micrantha (Trinius & Ruprecht) Thurber]	Poaceae	AA, BA, BL, CF, CC, DG, EA, EP, GF, GN, HN, JA, LP, LR, LA, ME, ML, MF, MZ, MN, PA, PT, RB, RT, SH, SJ, WL
Pistia stratiotes L.		Araceae	EP
Plagiobothrys scouleri (Hooker & Arnott) I. M. Johnston subsp. penicillata (Greene) Loeve		Boraginaceae	AL, BL, CC, CT, EA, GL, GA, GN, JA, JF, LR, ME, ML, MF, MZ, MN, PA, RT, SH, SJ, WL
Plantago elongata Pursh		Plantaginaceae	BL, ME, MZ
Plantago eriopoda Torrey		Plantaginaceae	AA, BL, CC, CU, GN, JA, LR, MF, MN, PA, SH, SW, TL, WL
Plantago lanceolata L.		Plantaginaceae	AM, BL, GF, GN, JF, KC, LP, LR, LN, ME, MF, MZ, TL
Plantago major L.		Plantaginaceae	AM, AL, BL, EP, GL, GN, HF, JF, LP, LA, ME, ML, MZ, OR, PA, RG, RT, TL
Plantago patagonica Jacquin		Plantaginaceae	AM, AA, BA, BN, BL, DT, DG, EP, EL, HF, JF, KC, LR, LA, LN, LO, ME, MF, MZ, MN, MR, SM, SW, WL, YM
Plantago tweedyi A. Gray		Plantaginaceae	EA, GF, GA, GN, LR, MF, RT
Platyschkuhria integrifolia (A. Gray) Rydberg var. oblongifolia (A. Gray) Ellison	[Bahia oblongifolia A. Gray]	Asteraceae	GF, ME, MN, MZ
Pneumonanthe affinis (Grisebach) Greene	[Gentiana affinis Grisebach in Hooker]	Gentianaceae	CT, DT, DL, EP, GA, GN, JA, LK, MF, PA, RB, SM, TL
Pneumonanthe andrewsii (Grisebach in Hooker) W. A. Weber	[Gentiana andrewsii Grisebach in Hooker]	Gentianaceae	BL, DV
Pneumonanthe bigelovii (A. Gray) Greene	[Gentiana bigelovii A. Gray]	Gentianaceae	BL, CC, CT, CU, EP, GL, JF, LR, PA, TL
Pneumonanthe parryi (Engelmann) Greene	[Gentiana parryi Engelmann]	Gentianaceae	AA, BL, CF, CC, CN, CT, DT, EA, EP, GF, GL, GA, GN, HF, JA, LP, LK, LR, ME, ML, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SM, SJ, ST, TL
Poa abbreviata R. Brown subsp. pattersonii (Vasey) Loeve et al.	[Poa pattersonii Vasey]	Poaceae	BL, CC, GL, GA, GN, LK, PA, ST
Poa agassizensis Boivin & D. Loeve		Poaceae	BL, CU, DT, GF, GL, GA, GN, JF, LP, LR, LA, ME, ML, MF, MZ, MN, PA, RB, RT, SH, SM, ST, TL, WL
Poa alpina L.		Poaceae	AL, AA, BL, CF, CC, CU, DL, EA, GF, GL, GA, GN, HN, HF, LP, LK, LR, ML, MZ, PA, RG, SH, SM, SJ, ST
Poa annua L.		Poaceae	BL, CH, DT, DV, DL, EP, GF, GA, GN, HF, JA, KC, ML, MF, MZ, PT, RT
Poa arctica R. Brown		Poaceae	AA, BL, CC, CN, DL, EA, GF, GL, GA, GN, HN, HF, LP, LK, LR, ME, PA, PT, RG, SH, SM, SJ, ST
Poa arctica R. Brown subsp. aperta (Scribner & Merrill) Soreng		Poaceae
Poa arida Vasey		Poaceae	BN, BL, EP, LN, PA, WL, YM
Poa bigelovii Vasey & Scribner		Poaceae	EP, LA
Poa bulbosa L.		Poaceae	BL, DT, DL, GF, JF, LR, ME, MF, MZ, MN, RT
Poa compressa L.		Poaceae	BL, CF, CC, CU, DL, DG, EP, GF, GL, GN, JF, JA, LR, LN, ME, MF, MZ, MN, PA, PT, RB, RG, RT, SJ, ST, TL, WL
Poa cusickii Vasey		Poaceae	BL, CF, CC, DT, DL, GF, GL, GA, GN, JA, HF, LP, LR, PA, PT, RB, SJ, ST
Poa cusickii Vasey subsp. cusickii		Poaceae	erroneous report [Catalog]
Poa cusickii Vasey subsp. epilis (Scribner) W. A. Weber		Poaceae	BL, CC, DT, GF, GL, GA, GN, JA, LP, LR, PA, PT, RB, SJ, ST
Poa cusickii Vasey subsp. pallida Soreng		Poaceae	GA, PA
Poa fendleriana (Steudel) Vasey		Poaceae	AL, BA, BL, CF, CC, CN, CU, DT, DL, DG, EA, EP, FN, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, PA, PT, RB, RG, RT, SH, SM, ST, TL
Poa glauca M. Vahl subsp. rupicola (Nash) W. A. Weber	[Poa rupicola Nash]	Poaceae	AL, BL, CF, CC, CU, DL, GL, GF, GA, GN, HN, JA, LP, LK, LR, ME, PA, SH, SJ, ST, TL
Poa glaucifolia Scribner & Williams		Poaceae	BL, GA, GN, MN, PA, ST, TL
Poa juncifolia Scribner		Poaceae	AL, BL, DT, EA, GF, GL, GA, GN, JA, JF, LR, ME, MF, MZ, MN, PA, RB, RT, SM, SJ
Poa leptocoma Trinius		Poaceae	BL, CC, DL, GF, GL, GA, GN, LP, LR, ME, PA, PT, RG, RT, SJ, SM, ST
Poa lettermanii Vasey		Poaceae	AL, BL, CC, EP, GA, GN, LR, PA, ST
Poa macroclada Rydberg		Poaceae	GF
Poa nemoralis L. subsp. interior (Rydberg) W. A. Weber	[Poa interior Rydberg]	Poaceae	AL, BL, CC, CN, CU, DT, DL, EA, GF, GL, GA, GN, HN, JF, LP, LK, LR, ME, ML, MN, PA, PT, RB, RT, SH, SJ, WL
Poa nervosa (Hooker) Vasey		Poaceae	BL, CF, CC, GF, GL, GA, GN, JA, LK, LR, MF, PA, SM, ST, TL
Poa occidentalis Vasey		Poaceae	GN
Poa palustris L.		Poaceae	AL, AA, BL, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, JA, JF, LR, ML, MF, PT, RB, RT, SH, SM, ST, TL
Poa pratensis L.		Poaceae	AL, AH, BA, BL, CH, CC, DT, DL, DG, EA, GF, GL, GA, GN, HN, JF, KC, LP, LR, LA, LN, LO, ME, ML, MF, MZ, MN, PA, PT, PE, RB, RG, RT, SH, SM, TL, WL, YM
Poa reflexa Vasey & Scribner		Poaceae	BL, CF, CC, DL, GF, GL, GA, GN, JA, LK, LR, LA, ME, MZ, MN, PA, PT, RB, RT, SH, SM, SJ, ST
Poa secunda J. Presl in K. Presl	[P. canbyi (Scrib.) Howell, P. nevadensis Vasey ex Scrib., P. sandbergii Vasey]	Poaceae	BL, CF, CC, DT, DL, GF, GL, GA, GN, JA, JF, LR, ME, ML, MF, MZ, MN, PA, RB, RT, SH, ST
Poa tracyi Vasey		Poaceae	BL, CC, GN, HF, LR, PA, PE, RB
Poa trivialis L.		Poaceae	BL, JF
Pocilla biloba (L.) W. A. Weber	[Veronica biloba L.]	Scrophulariaceae	BL, CU, DT, DG, GF, GN, JF, ME, MF, RB, RT
Pocilla polita (E. Fries) Fourreau		Scrophulariaceae	BL, CH, DV, JF
Podistera eastwoodiae (Coulter & Rose) Mathias & Constance		Apiaceae	CT, DL, GF, GN, HN, LP, LK, ME, MZ, OR, PT, RB, SJ
Podospermum laciniatum (L.) De Candolle		Asteraceae	AM, BA, BL, CH, DT, DG, JF, KW, LR, LN, MR, MZ, PE, WL
Poinsettia dentata (Michaux) Klotsch & Garcke		Euphorbiaceae	BA, BL, CH, CC, JF, KW, KC, LA, LN, LO, ME, PW
Polanisia dodecandra (L.) De Candolle		Capparaceae	BA, BN, BL, CW, CH, DT, EP, EL, FN, HF, JF, KW, KC, LA, LN, LO, ME, MF, OT, PE, WN, WL, YM
Polanisia jamesii (Torrey & Gray) Iltis		Capparaceae	CH, KC, LA, MR, PL, SW, WL, YM
Polemonium brandegei (A. Gray) Greene		Polemoniaceae	AL, BL, CC, GA, GN, HF, LR, LA, ML, PA, RT
Polemonium caeruleum L. subsp. amygdalinum (Wherry) Munz		Polemoniaceae	GF, GA, JA, LK, LR, ML, PA, SH, ST, TL
Polemonium confertum A. Gray		Polemoniaceae	AL, BL, CF, CC, DL, GA, GN, HN, LP, PA, PT, SH, SJ, ST
Polemonium foliosissimum (A. Gray) A. Gray		Polemoniaceae	AL, AA, BL, CC, CN, CT, CU, DT, DL, DG, EP, GF, GL, GN, HF, JF, LP, ME, ML, MF, MZ, MN, PA, RB, RT, SM, SJ, TL, WL
Polemonium pulcherrimum Hooker subsp. delicatum (Rydberg) Brand		Polemoniaceae	AL, BL, CF, CC, CN, CU, DL, EP, GF, GL, GA, GN, HN, HF, JA, LK, LR, ME, ML, MZ, OR, PA, PT, SH, SM, SJ, ST
Polemonium viscosum Nuttall		Polemoniaceae	BL, CF, CC, CU, DL, EA, EP, GF, GL, GA, GN, HN, JA, LP, LK, LR, ML, MZ, MN, PA, PT, RT, SH, SM, SJ, ST
Poliomintha incana (Torrey) A. Gray		Lamiaceae	MZ
Polygala alba Nuttall		Polygalaceae	BA, LA, SW, YM
Polygala subspinosa S. Watson		Polygalaceae	ME, MZ, MN
Polygonum arenastrum Boreau		Polygonaceae	AL, AA, BL, CH, CN, EP, EL, GF, GL, GA, GN, HF, JA, JF, KW, KC, LP, LR, LA, LN, ME, ML, MF, MZ, MN, PA, PT, RB, RT, SM, TL, WL
Polygonum argyrocoleon Steudel ex Kuntze		Polygonaceae	AL, BA, KW, MF, MZ
Polygonum aviculare L. var. angustissimum Meissner		Polygonaceae
Polygonum aviculare L. var. aviculare		Polygonaceae
Polygonum douglasii Greene		Polygonaceae	BL, CC, CN, DT, DL, EA, EP, GF, GL, GA, GN, HN, JF, LK, LR, ME, MF, MZ, MN, OR, PA, PT, RB, RT, SH, SM, SJ, ST
Polygonum engelmannii Greene		Polygonaceae	BL, LR, ME, PA
Polygonum erectum L. subsp. achoreum (S. F. Blake) Loeve & Loeve		Polygonaceae	BL, KC, LR, PA
Polygonum minimum S. Watson		Polygonaceae	GL, GA, JA, LR, RT
Polygonum polygaloides Meissner subsp. kelloggii (Greene) Hickman		Polygonaceae	BL, DL, GA, GN, JA, LR, ME, MF, MZ, MN, PA, PT, RT
Polygonum ramosissimum Michaux		Polygonaceae	BA, BN, BL, CH, EA, EP, GF, JF, KW, KC, LP, LA, LN, ME, MF, MR, PE, WL, YM
Polypodium hesperium Maxon		Polypodiaceae	LP, OR, SJ
Polypodium saximontanum Windham	[Polypodium amorphum Suksdorf]	Polypodiaceae	BL, DG, EP, GN, HF, JF, LP, LR, PT, RT, SH
Polypogon elongatus Humboldt, Bonpland, & Kunth		Poaceae
Polypogon interruptus Humboldt, Bonpland & Kunth		Poaceae	AH, BL
Polypogon monspeliensis (L.) Desfontaines		Poaceae	AM, BA, BN, BL, CH, EP, EL, FN, JF, KW, KC, LA, LN, LO, ME, MF, MZ, MN, MR, WL, YM
Polypogon viridis (Gouan) Breistroffer		Poaceae
Polystichum lonchitis (L.) Roth		Dryopteridaceae	BL, CC, GF, GL, GA, HF, LP, LR, OR, RT
Polystichum scopulinum (D. C. Eaton) Maxon		Dryopteridaceae
Populus acuminata Rydberg		Salicaceae	AL, BL, DT, DV, EP, JF, LR, LA, ME, MF, MZ, MN
Populus alba L.		Salicaceae	BL, CH, JF, ME
Populus angustifolia James		Salicaceae	AL, AA, BL, CN, DT, EA, EP, GF, GL, GA, GN, JA, JF, LR, ME, MF, MZ, MN, PT, PE, RB, SH, SJ, WL
Populus balsamifera L.		Salicaceae	BL, EA, EP, GL, GA, GN, JA, JF, LR, PA, RB, RT, ST, TL
Populus deltoides H. Marshall subsp. monilifera (Aiton) Eckenwalder		Salicaceae	AM, BA, BN, BL, CH, EP, EL, GN, JF, KW, KC, LR, LA, LN, LO, OT, PE, SW, WL, YM
Populus deltoides H. Marshall subsp. wislizenii (S. Watson) Eckenwalder		Salicaceae	DT, GF, KW, LP, ME, MF, MZ, MN, RB
Populus tremuloides Michaux		Salicaceae	BL, CF, CN, CT, CU, DT, DL, EA, EP, GF, GL, GA, GN, JA, LP, LK, LR, LA, ME, ML, MF, MZ, MN, PA, PT, PE, RB, RG, RT, SH, SJ, ST, TL
Portulaca halimoides L.		Portulacaceae
Portulaca oleracea L.		Portulacaceae	AH, AA, BA, BL, CN, JF, LA, LN, ME, MF, MZ, WL, WN
Potamogeton alpinus Balbis		Potamogetonaceae	BL, CC, GL, GA, JA, LK, LR, RG, ST, TL
Potamogeton amplifolius Tuckerman		Potamogetonaceae
Potamogeton crispus L.		Potamogetonaceae	AH, JF
Potamogeton diversifolius Rafinesque		Potamogetonaceae	BL, WL, YM
Potamogeton epihydrus Rafinesque var. nuttallii (Chamisso & Schlechtendal) Fernald		Potamogetonaceae	GN, JA, LR
Potamogeton filiformis Persoon	[Coleogeton filiformis (Pers.) D. Les & R. Haynes]	Potamogetonaceae	EA, GF, GA, GN, JA, LP, LR, MF, MN, PA, RB, SJ
Potamogeton foliosus Rafinesque		Potamogetonaceae	AL, BL, GL, GN, JF, LK, LR, LA, LN, WL, YM
Potamogeton gramineus L.		Potamogetonaceae	BL, GL, GA, GN, JA, JF, LR, ME, RB, RT, SJ
Potamogeton illinoensis Morong		Potamogetonaceae	MN
Potamogeton natans L.		Potamogetonaceae	GA, GN, JA, JF, LR, YM
Potamogeton nodosus Poiret in Lamarck		Potamogetonaceae	AL, BL, GN, JF, LR, ME, RG, YM
Potamogeton pectinatus L.	[Stuckenia pectinata (L.) Borner]	Potamogetonaceae	AM, BL, DV, DL, GF, GN, JA, KW, LK, LR, LA, LN, PA
Potamogeton perfoliatus L. subsp. richardsonii (Bennett) Hulten		Potamogetonaceae	BL, CC, GF, JA, YM
Potamogeton praelongus Wulfen		Potamogetonaceae	CC, GF, PA
Potamogeton pusillus L.		Potamogetonaceae	AL, BL, GN, LP, LR, MF, PA, TL
Potamogeton pusillus L. var. pusillus		Potamogetonaceae
Potamogeton pusillus L. var. tenuissimus Mertens & Koch in Rohling		Potamogetonaceae
Potamogeton vaginatus Turczaninov	[Coleogeton vaginatus (Turcz.) D. Les & R. Haynes]	Potamogetonaceae	JA
Potentilla ambigens Greene		Rosaceae	EP, LR, ML
Potentilla anglica Laicharding		Rosaceae	BL
Potentilla argentea L.		Rosaceae	BL, EP, LR
Potentilla biennis Greene		Rosaceae	GA, GN, MF
Potentilla concinna Richardson		Rosaceae	AL, BL, CC, EA, GF, GL, GN, HN, JA, LR, MF, PA, RB, SH, SM, SJ, ST
Potentilla concinna Richardson var. bicrenata (Rydberg) Welsh & Johnston		Rosaceae
Potentilla concinna Richardson var. concinna		Rosaceae
Potentilla crinita A. Gray		Rosaceae	AA
Potentilla diversifolia Lehmann		Rosaceae	AL, BL, CF, CC, DL, EA, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, PA, PT, RT, SH, SJ, ST
Potentilla effusa Douglas ex Lehmann		Rosaceae	BL, CC, GL, GA, JA, JF, LR, MF, PA, TL
Potentilla flabelliformis Lehmann		Rosaceae	GN
Potentilla gracilis Douglas		Rosaceae	DL, GL, GA, GN, HF, JA, JF, LP, LA, ME, ML, MF, PA, RB, RT, SH
Potentilla hippiana Lehmann		Rosaceae	AA, AL, BL, CF, CC, CU, DT, DL, DG, EP, GF, GA, GN, HN, HF, JF, LP, LR, LA, ME, ML, MF, MZ, MN, PA, RG, RT, SH, SM, SJ, TL, WL
Potentilla hookeriana Lehmann		Rosaceae	GF, GN, LK, PT, ST
Potentilla nivea L.		Rosaceae	BL, GL, GA, GN, HN, LK, LR, MZ, PA, PT, SJ, ST
Potentilla norvegica L.		Rosaceae	AL, BL, DV, DG, EP, GL, GA, GN, HF, JA, JF, LP, LR, ME, MN, PA, RG, RT, WL
Potentilla ovina Macoun		Rosaceae	BL, CF, GL, GN, LK, LR, MF, PA, ST
Potentilla pensylvanica L.		Rosaceae	AL, AH, BL, CN, CT, DG, EP, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, LA, ML, PA, PE, RG, SH, TL, WL
Potentilla plattensis Nuttall ex Torrey & Gray		Rosaceae	AL, CT, CU, GN, LK, LR, ML, PA, SH, TL, WL
Potentilla pulcherrima Lehmann		Rosaceae	AA, BL, CF, CC, CN, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, MF, MZ, MN, OR, PA, RB, RG, RT, SH, SM, SJ, ST, TL
Potentilla recta L.		Rosaceae	BL, CU, JF, LR
Potentilla rivalis Nuttall ex Torrey & Gray		Rosaceae	AL, BL, EP, JF, KW, KC, LA, MF, TL, WL
Potentilla rubricaulis Lehmann		Rosaceae	CF, CC, GN, LK, PA, ST
Potentilla rupincola Osterhout		Rosaceae	BL, LR, PA
Potentilla subjuga Rydberg		Rosaceae	AL, CF, CC, EP, GN, LK, LR, PA, RB, SM, ST
Potentilla subviscosa Greene		Rosaceae	LA
Potentilla supina L. subsp. paradoxa (Nuttall ex Torrey & Gray) Sojak		Rosaceae	AL, BL, JF, KW, LR, WL
Potentilla uniflora Ledebour		Rosaceae	BL, CC, GF, GL, GA, GN, LP, LR, RG, SH, ST
Prenanthella exigua (A. Gray) Rydberg		Asteraceae	MZ, MN
Prenanthes racemosa Michaux		Asteraceae	AA, BL, CU, EP, GL, JF, LR
Primula angustifolia Torrey		Primulaceae	AL, BL, CF, CC, CU, EA, EP, GL, GA, GN, LK, LR, PA, SH, ST, TL
Primula egaliksensis Wormskiold		Primulaceae	PA
Primula incana Jones		Primulaceae	CU, EP, GN, JA, LR, PA
Primula parryi A. Gray		Primulaceae	BL, CF, CC, CU, EA, EP, GF, GL, GA, GN, HN, HF, LP, LK, LR, ME, MZ, PA, PT, RT, SH, SJ, ST
Prionopsis ciliata (Nuttall) Nuttall		Asteraceae	BA, ME
Proatriplex pleiantha (W. A. Weber) Stutz & Chu		Chenopodiaceae	MZ
Proboscidea louisianica (P. Miller) Thellung		Martyniaceae	BA, BL, CH, CW, KW, KC, LA, MZ, WN
Prosartes trachycarpa S. Watson	[Disporum trachycarpum (S. Wats.) Benth. & Hook.]	Uvulariaceae	BL, DT, DG, EP, GF, GN, LR, MZ, MN, RB, RT, SM
Prosopis glandulosa Torrey		Fabaceae	BA, LA
Prunella vulgaris L.		Lamiaceae	AH, BL, CT, CU, DT, DL, DG, EP, GF, GL, GN, HF, JA, JF, LP, ME, MZ, MN, RB, RT, SJ, ST
Prunus americana H. Marshall		Rosaceae	BA, BL, CU, DV, DG, EP, FN, JF, LA, LR, PE, YM
Prunus angustifolia H. Marshall		Rosaceae	BA
Prunus gracilis Engelmann & Gray		Rosaceae	BA
Prunus rivularis Scheele		Rosaceae	BA
Psathyrostachys juncea (Fischer) Nevski	[Elymus juncea Fischer]	Poaceae	AH, BL, CH, CT, GN, JF, LR, ME, MF, MZ, MN, RB, SM, TL
Pseudocymopterus montanus (A. Gray) Coulter & Rose		Apiaceae	AA, BL, CF, CC, CN, CT, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, LA, ME, ML, MN, OR, PA, PT, RG, RT, SH, SM, SJ, ST, TL
Pseudognaphalium canescens (De Candolle) W. A. Weber	[Gnaphalium wrightii A. Gray; Gnaphalium canescens DC]	Asteraceae	BA, BL, JF, LR, LA
Pseudognaphalium stramineum (Humboldt, Bonpland & Kunth) W. A. Weber	[Gnaphalium chilense Sprengel; Gnaphalium stramineum HBK]	Asteraceae	BL, DG, EP, GN, JF, LR, WL
Pseudognaphalium viscosum (HBK) W. A. Weber	[Gnaphalium viscosum HBK]	Asteraceae	BL, EP, GA, GN, LP, LR
Pseudoroegneria spicata (Pursh) Loeve subsp. inermis (Scribner & Smith) Loeve	[Agropyron inerme (Scribner & Smith) Rydberg]	Poaceae	DT, GF, GN, MF, MZ, MN, RB, RT
Pseudoroegneria spicata (Pursh) Loeve subsp. spicata	[Agropyron spicatum (Pursh) Scribner & Smith]	Poaceae	GF, GN, MF, PT, RT
Pseudostellaria jamesiana (Torrey) Weber & Hartman	[Stellaria jamesiana Torrey]	Alsinaceae	BL, DT, DL, GF, GN, JA, JF, LA, ME, MF, MZ, MN, PT, RB, RT
Pseudotsuga menziesii (Mirbel) Franco		Pinaceae	AL, BL, CN, CT, CU, DL, DG, EP, GA, GN, JF, LP, LK, LR, ME, ML, MF, MZ, MN, RB, RG, RT, TL
Psilochenia acuminata (Nuttall) W. A. Weber	[Crepis acuminata Nuttall]	Asteraceae	DT, GA, ME, MF, MZ, MN, RB
Psilochenia atribarba (Heller) W. A. Weber	[Crepis atribarba Heller]	Asteraceae	BL, EA, GL, LR, ME, MF, MN, RT, ST
Psilochenia intermedia (A. Gray) W. A. Weber	[Crepis intermedia A. Gray]	Asteraceae	DL, GN, LP, MF, MZ, SM
Psilochenia modocensis (Greene) W. A. Weber	[Crepis modocensis Greene]	Asteraceae	GF, GA, GN, MF, MZ, MN, RB
Psilochenia occidentalis (Nuttall) Nuttall	[Crepis occidentalis Nuttall]	Asteraceae	AH, AA, BL, CC, DT, DL, GN, JF, ME, MF, MZ, MN, OR, RB, SH, SM, WL
Psilochenia occidentalis (Nuttall) Nuttall subsp. costata (A. Gray) W. A. Weber	[Crepis occidentalis Nuttall subsp. costata (A. Gray) Babcock & Stebbins]	Asteraceae
Psilochenia occidentalis (Nuttall) Nuttall subsp. occidentalis	[Crepis occidentalis Nuttall]	Asteraceae
Psilochenia runcinata (James ex Torrey) Loeve & Loeve	[Crepis runcinata (James ex Torrey) Torrey & Gray]	Asteraceae	AL, AA, BL, CC, CN, CT, CU, DT, DG, EP, GL, GA, GN, HF, JA, JF, LK, LR, LO, MZ, PA, PE, RB, RG, RT, SH, SM, SW, TL, WL
Psilostrophe bakeri Greene		Asteraceae	DT, GF, HF, ME, MN
Psilostrophe tagetina (Nuttall) Greene		Asteraceae	LA, LN
Psoralidium argophyllum (Pursh) Rydberg	[Psoralea argophylla Pursh]	Fabaceae	BL, DG, KC, LA, SW, WL, YM
Psoralidium digitatum (Nuttall) Rydberg	[Psoralea digitata Nuttall]	Fabaceae	CH, WL, YM
Psoralidium lanceolatum (Pursh) Rydberg	[Psoralea lanceolata Pursh]	Fabaceae	AL, BA, BN, CH, CW, EP, EL, HF, JF, KC, LN, LO, ME, MF, SH, WN, WL, YM
Psoralidium linearifolium (Torrey & Gray) Rydberg	[Psoralea linearifolium Torrey & Gray]	Fabaceae	YM
Psoralidium tenuiflorum (Pursh) Rydberg	[Psoralea tenuiflora Pursh]	Fabaceae	AM, AH, AA, BA, BN, BL, CH, CW, EP, EL, HF, JF, KW, KC, LP, LR, LA, LN, MR, OT, SW, WL, YM
Psychrophila leptosepala (De Candolle) W. A. Weber	[Caltha leptosepala De Candolle]	Helleboraceae	AL, AA, BL, CC, CN, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, HF, LP, LK, LR, ML, MN, MZ, OR, PA, PT, RT, SH, SJ, ST
Ptelea trifoliata L.		Rutaceae	EP, FN, LA, OT, PE, TL
Pteridium aquilinum (L.) Kuhn subsp. lanuginosum (Bongard) Hulten		Dennstaedtiaceae	AA, BL, CN, DG, EP, GF, GN, JF, LP, LA, ME, MZ, PA, RB, RT
Pterogonum alatum (Torrey) Gross	[Eriogonum alatum Torrey]	Polygonaceae	AL, AA, BL, CN, CU, DG, DT, EP, EL, HF, JF, LR, LA, LO, ME, MZ, MN, OR, PA, RB, SH, SM, TL, WL, YM
Pterospora andromedea Nuttall		Monotropaceae	AA, BL, CT, EP, GL, GA, JA, LP, LA, ME, MF, MZ, RT
Ptilagrostis porteri (Rydberg) W. A. Weber	[Stipa porteri Rydberg]	Poaceae	EP, PA, ST
Puccinellia airoides Watson & Coulter		Poaceae	AL, AH, BL, CC, EP, EL, GN, JA, JF, LR, ME, ML, MF, MZ, PA, PE, RB, RG, SH, TL
Puccinellia distans (L.) Parlatore		Poaceae	LN
Pulsatilla patens (L.) P. Miller subsp. multifida (Pritzel) Zamels	[Pulsatilla ludoviciana (Nuttall) Heller; Anemone patens L. var. nuttalliana A. Gray]	Ranunculaceae	BL, CF, DG, EA, EP, FN, GL, GA, GN, HF, JA, JF, LP, LK, LR, LA, ME, MN, PA, PT, PE, RG, RT, SH, SM, ST, TL
Purshia stansburiana (Torrey) Henrickson		Rosaceae	ME, MZ, MN, SM
Purshia tridentata (Pursh) De Candolle		Rosaceae	AA, BL, DT, EA, GL, GA, GN, JA, LP, LR, ME, MF, MZ, MN, PT, RB, RT, SM
Pyrola chlorantha Swartz		Pyrolaceae	BL, CU, DL, DG, EP, GA, GN, HF, JA, ML, MZ, PA, SM, SJ, ST
Pyrola minor L.		Pyrolaceae	BL, CC, DT, EA, GF, GA, HF, JA, LK, ME, ML, MF, PA, RT, SH, SJ, ST
Pyrola picta J. E. Smith		Pyrolaceae	BL, EP, FN, RT
Pyrola rotundifolia L. subsp. asarifolia (Michaux) Loeve	[Pyrola asarifolia Michaux]	Pyrolaceae	BL, CC, CN, EA, EP, GF, GL, GA, JA, JF, LK, LR, ME, ML, PA, PT, RG, RT, SH, SJ, SM, ST, TL
Pyrrocoma clementis Rydberg		Asteraceae	CF, CN, GF, GN, HN, LP, ME, ML, PA, PT
Pyrrocoma crocea (A. Gray) Greene		Asteraceae	AA, DL, GF, GA, GN, JA, LP, ME, MZ, MN, PT, RB, RT, SM
Pyrrocoma lanceolata (Hooker) Greene		Asteraceae	AL, EP, GA, GN, JA, RG, RT, SH
Pyrrocoma uniflora (Hooker) Greene		Asteraceae	CF, GN, PA, SH
Quercus ajoensis C. J. Muller		Fagaceae	MZ
Quercus gambelii Nuttall		Fagaceae	AA, BA, BL, CU, DT, DL, DG, EP, GF, GN, HF, JF, LP, LA, ME, MF, MZ, MN, OR, PT, PE, RB, RT, SH, SM, SJ
Quercus grisea Liebmann		Fagaceae	BA, EP, FN, LA
Quercus havardii Rydberg var. tuckeri Welsh		Fagaceae	ME, MZ, PT
Quercus turbinella Greene		Fagaceae	FN, LP, LA, ME, MZ, MN
Quercus undulata Torrey		Fagaceae	DG, EP, FN, LA, PE
Quincula lobata (Torrey) Rafinesque		Solanaceae	AH, BA, BL, CH, CW, DV, EP, EL, FN, HF, JF, KW, LR, LA, LN, PW, WL, YM
Ranunculus abortivus L. subsp. acrolasius (Fernald) Kapoor & Loeve		Ranunculaceae	BL, DG, GL, GA, JF, RG, RT, TL
Ranunculus acriformis A. Gray		Ranunculaceae	BL, CF, EP, JA, JF, LK
Ranunculus adoneus A. Gray		Ranunculaceae	BL, CF, CC, EA, GF, GL, GA, GN, JA, LR, PA, PT, RT, ST
Ranunculus alismifolius Geyer ex Bentham var. montanus S. Watson		Ranunculaceae	BL, CC, CN, DT, DL, GF, GL, GA, GN, HN, JA, LP, LR, ME, ML, MZ, MN, PT, RT, SJ, ST
Ranunculus bulbosus L.		Ranunculaceae	JF
Ranunculus cardiophyllus Hooker		Ranunculaceae	CN, DT, EP, GL, GA, HN, LK, LR, LA, ML, PA, SH, SJ, TL
Ranunculus eschscholtzii Schlechtendal		Ranunculaceae	BL, CC, EA, GF, GL, GA, GN, LP, LR, ME, MZ, PA, RT, SJ, SM
Ranunculus gelidus Karilin & Kirilow subsp. grayi (Britton) Hulten	[Ranunculus grayi Britton]	Ranunculaceae	CF, CC, GN, LK, PA, ST
Ranunculus glaberrimus Hooker var. ellipticus Greene		Ranunculaceae	BL, GF, GA, GN, JF, LR, ME, MF, MZ, MN, PA, RT, ST
Ranunculus gmelinii De Candolle var. hookeri (D. Don) L. Benson		Ranunculaceae	CF, CT, DL, GA, GN, JA, LR, PA, SM, ST
Ranunculus hyperboreus Rottboel subsp. intertextus (Greene) Kapoor & Loeve		Ranunculaceae	BL, CF, CC, GL, GA, GN, ML, MF, PA, SJ, ST, TL
Ranunculus inamoenus Greene		Ranunculaceae	AL, AA, BL, CF, CC, CN, CT, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HF, LK, LR, LA, ME, ML, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SM, SJ, ST, TL
Ranunculus jovis A. Nelson		Ranunculaceae	RT
Ranunculus macauleyi A. Gray		Ranunculaceae	CN, CT, CU, DL, EA, GN, HN, LP, ML, OR, PA, SH, SM, SJ
Ranunculus macounii Britton		Ranunculaceae	AL, AA, BA, BL, CN, CT, CU, DT, DV, DL, DG, EP, GF, GL, GA, GN, HF, JF, LP, LR, ME, ML, MZ, PE, RB, RG, RT, SH, SM, TL, WL
Ranunculus pedatifidus J. E. Smith		Ranunculaceae	BL, CF, GL, GA, GN, LR, PA, PT, RT, ST
Ranunculus pensylvanicus L. f.		Ranunculaceae	AL, CN, JF, LR, RG, SH
Ranunculus pygmaeus Wahlenberg		Ranunculaceae	BL, CC, GN, LK, LR, PA, ST
Ranunculus repens L.		Ranunculaceae	BL, DV, GN, JF, MZ
Ranunculus reptans L. var. ovalis Torrey & Gray		Ranunculaceae	BL, EA, GL, GA, GN, JA, LK, LR, ME, PA
Ranunculus uncinatus D. Don		Ranunculaceae	CN, DT, DL, GA, GN, JA, ME, MF, MZ, RB, RT, SJ, SM
Ranunculus uncinatus D. Don var. earlei (Greene) L. Benson		Ranunculaceae
Ranunculus uncinatus D. Don var. parviflorus (Torrey) L. Benson		Ranunculaceae
Raphanus raphanistrum L.		Brassicaceae	GN, MZ
Raphanus sativus L.		Brassicaceae
Ratibida columnifera (Nuttall) Wooton & Standley		Asteraceae	AA, BA, BL, CH, DV, DG, EL, GN, JF, KW, KC, LR, LA, LN, LO, MZ, PE, SW, TL, YM
Ratibida tagetes (James) Barnhart		Asteraceae	AA, BA, CH, CW, DV, EP, KW, KC, LA, LN, OT, YM
Rayjacksonia annua (Rydberg) Hartman & Lane	[Machaeranthera phyllocephala (De Candolle) Shinners]	Asteraceae	BN, BL, LN, LO, OT, PE, SW, WL
Redfieldia flexuosa (Thurber ex A. Gray) Vasey		Poaceae	AL, BA, BN, EP, KC, PL, SH, SW, WN, WL
Reseda lutea L.		Resedaceae	BL, DV, JF, PE, SH
Reseda luteola L.		Resedaceae
Reverchonia arenaria A. Gray		Euphorbiaceae	BN
Reynoutria japonica Houttuyn		Polygonaceae	BL
Rhamnus cathartica L.		Rhamnaceae	BL, EP, JF
Rhamnus smithii Greene		Rhamnaceae	AA, DL, RB, SM
Rheum rhaponticum L.		Polygonaceae	BL, LR
Rhinanthus minor L. subsp. borealis (Sterneck) Loeve		Scrophulariaceae	AA, BL, CN, CU, GL, HF, PA, TL
Rhodiola integrifolia Rafinesque	[Sedum integrifolium (Rafinesque) A. Nelson]	Crassulaceae	BL, CF, CC, DL, EA, EP, GF, GL, GA, GN, HN, LP, LK, LR, LA, ME, ML, MZ, OR, PA, PT, RG, RT, SM, SJ, ST
Rhus aromatica Aiton subsp. pilosissima (Engelmann) W. A. Weber		Anacardiaceae	BA, BN, EP, JF, LA, OT, PE
Rhus aromatica Aiton subsp. trilobata (Nuttall ex Torrey & Gray) W. A. Weber	[Rhus trilobata Nuttall ex Torrey & Gray]	Anacardiaceae	AL, AH, AA, BA, BL, CF, CN, CU, DT, DV, DG, EA, EP, GF, GN, HF, JF, KC, LP, LR, LA, LN, LO, ME, ML, MF, MZ, MN, PL, PT, PW, PE, RB, RT, SH, SM, SW, WN, WL, YM
Rhus glabra L.		Anacardiaceae	BL, CU, EP, JF, LP, ME, MZ, MN, PE
Ribes americanum P. Miller		Grossulariaceae	AH, DG, EP, JF, LR, TL
Ribes aureum Pursh		Grossulariaceae	AL, AH, AA, BA, BN, BL, CU, DT, DL, DG, EA, EP, HF, JF, KC, LP, LR, LA, LN, LO, ME, MF, MZ, MN, MR, OT, PW, PE, RB, RG, SH, SW, TL, WL, YM
Ribes cereum Douglas		Grossulariaceae	AL, AA, BA, BL, CF, CN, CT, CU, DG, EA, EP, GF, GL, GA, GN, JA, JF, LR, LA, LN, LO, ME, ML, MF, MN, OT, PA, PE, RB, RG, RT, SH, ST, TL, WN, WL
Ribes coloradense Coville		Grossulariaceae	BL, CF, GF, GL, GA, GN, LK, LR, MZ, PA, PT, RT, SH, SJ, ST
Ribes divaricatum Douglas		Grossulariaceae	BL, LR, ME, PA, RT, ST
Ribes inerme Rydberg		Grossulariaceae	AL, AA, BL, CF, CC, CN, CU, DT, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, ME, ML, MF, MN, MZ, OR, PA, PT, PE, RB, RG, RT, SJ, SM, ST, TL
Ribes inerme Rydberg fma incisum W. A. Weber		Grossulariaceae
Ribes lacustre (Persoon) Poiret		Grossulariaceae	BL, EA, GF, GA, GN, JA, LR, ME, OR, RT, SJ
Ribes leptanthum A. Gray		Grossulariaceae	AL, BA, CF, CN, CU, DG, EP, GF, GA, GN, JF, LA, ME, MZ, MN, RB, RG, SH
Ribes montigenum McClatchie		Grossulariaceae	AL, BL, CF, CC, CN, CU, DT, DL, EP, GF, GL, GA, GN, HN, HF, JA, LK, LP, LR, ME, ML, MZ, PA, PT, RB, RT, SH, SM, SJ, ST
Ribes odoratum Wendland		Grossulariaceae	BL, KC, YM
Ribes viscosissimum Pursh		Grossulariaceae	GA, RT
Ribes wolfii Rothrock		Grossulariaceae	CN, DT, DL, EA, GF, GN, LA, ME, ML, MZ, MN, OR, PT, RB, SJ, ST
Robinia neomexicana A. Gray		Fabaceae	BL, DG, EP, GF, HF, LA, ME
Robinia pseudo-acacia L.		Fabaceae	BL, JF, ME, MN
Rorippa coloradensis Stuckey		Brassicaceae
Rorippa curvipes Greene var. alpina (S. Watson) Stuckey		Brassicaceae	BL, CF, GA, GN, HN, JA, LK, LR, ML, PA, PT, SJ, TL
Rorippa curvipes Greene var. curvipes		Brassicaceae
Rorippa palustris (L.) Besser		Brassicaceae	AM, AL, BL, DG, EP, GF, GA, GN, JA, JF, LR, MF, MZ, PT, RT, WL
Rorippa palustris (L.) Besser subsp. hispida (Desvaux) Jonsell		Brassicaceae
Rorippa palustris (L.) Besser var. glabra (O. E. Schulz) Stuckey		Brassicaceae
Rorippa sinuata (Nuttall in Torrey & Gray) A. S. Hitchcock		Brassicaceae	AL, BA, BL, CH, CW, EP, GL, GN, JF, KW, LR, LN, ML, MF, MR, OT, SH, SW, WL, YM
Rorippa sphaerocarpa (A. Gray) Britton		Brassicaceae	BL, DV, EP, JF, LP, ML, MZ, PA
Rorippa sylvestris (L.) Besser		Brassicaceae	BL
Rorippa tenerrima Greene		Brassicaceae
Rorippa teres (Michaux) Stuckey		Brassicaceae	AL, BL, CN, CU, DT, DV, DG, EA, GF, GL, GA, GN, JA, LR, ME, ML, MF, MZ, MN, PA, PT, PE, RB, RT, SM, SJ, TL, WL
Rosa arkansana T. C. Porter		Rosaceae	AH, BA, BL, EP, JF, KC, LR, LA, LN, LO, TL, WN
Rosa nutkana Presl var. hispida Fernald		Rosaceae	MZ, RT
Rosa rubiginosa L.		Rosaceae	BL
Rosa sayi Schweinitz		Rosaceae	AL, BL, CC, CT, DT, EP, GF, GL, GA, JF, LK, LR, ML, MF, PA, RB, RG, RT
Rosa woodsii Lindley		Rosaceae	AL, AA, BL, CF, CN, CT, CU, DT, DV, DL, DG, EA, EP, FN, GF, GA, GN, HF, JA, JF, LP, LR, LN, ME, ML, MF, MZ, MZ, MN, MR, PA, PL, PT, PE, RB, RG, RT, SH, SJ, SM, SW, TL, WN, YM
Rotala ramosior (L.) Koehne		Lythraceae	BL
Rubacer parviflorum (Nuttall) Rydberg	[Rubus parviflorus Nuttall]	Rosaceae	AA, BL, CN, DT, DL, DG, EA, EP, GN, LP, ME, MZ, OR, PT, RB, RT, SJ
Rubus idaeus L. subsp. melanolasius (Dieck) Focke		Rosaceae	AL, AA, BL, CU, DT, DL, EP, GF, GL, GA, GN, HF, JA, JF, LR, LA, ML, MF, MZ, MN, PT, RB, RG, RT, SH, SM, SJ, ST
Rubus laciniatus Willdenow		Rosaceae	BL
Rubus occidentalis L.		Rosaceae	GL
Rudbeckia ampla A. Nelson	[Rudbeckia laciniata L. var. ampla (A. Nelson) Cronquist]	Asteraceae	AL, AA, BL, CC, CN, CT, DT, DG, EA, GF, GA, GN, HF, JF, LP, LR, ME, MF, MZ, MN, RB, RT
Rudbeckia hirta L.		Asteraceae	BL, CC, CN, CT, CU, DG, EP, GL, GA, GN, HF, JF, LK, LR, PA, TL
Rudbeckia occidentalis Nuttall var. montana (A. Gray) Perdue	[Rudbeckia montana A. Gray]	Asteraceae	DT, GN, ME, RB
Rudbeckia triloba L.		Asteraceae	BL
Rumex altissimus Wood		Polygonaceae	CW, KW, KC, LA, LN, OT, SW, WL, YM
Rumex aquaticus L. subsp. occidentalis (S. Watson) Hulten		Polygonaceae	BL, GL, GA, GN, JA, LR, ME, MF, MZ, PA, RT, SH, SM, TL
Rumex crispus L.		Polygonaceae	AA, BA, BL, CH, CU, EP, EL, GL, GN, HF, JF, KC, LP, LR, LA, LN, ME, MF, MZ, MN, OT, PT, RB, RT, SW, WL, YM
Rumex densiflorus Osterhout		Polygonaceae	CC, DG, GF, GL, GA, GN, HN, LK, LR, ME, ML, MZ, RT, ST, TL
Rumex hymenosepalus Torrey		Polygonaceae	ME, MN, SM
Rumex maritimus L. subsp. fueginus (Philippi) Hulten		Polygonaceae	AM, AL, BL, DV, GL, GA, JA, JF, KW, KC, LN, ME, MF, RT, WL
Rumex obtusifolius L.		Polygonaceae	BL, GL, JF
Rumex stenophyllus Ledebour		Polygonaceae	BL, KW, KC, LN, ME, OT, SW, WL
Rumex triangulivalvis (Danser) Rechinger f.		Polygonaceae	AL, BA, BL, CN, DG, EP, GF, GL, GA, GN, JA, JF, LP, LK, LR, LA, ME, ML, MF, MZ, MN, PA, PT, RB, RG, RT, SH, SM, ST, TL
Rumex utahensis Rechinger		Polygonaceae	RB
Rumex utahensis Rechinger f.		Polygonaceae
Rumex venosus Pursh		Polygonaceae	BA, BL, CT, CW, CU, EP, EL, JF, KW, KC, LN, LO, MF, MR, RB, SW, WL, YM
Ruppia cirrhosa (Petagna) Grande subsp. occidentalis (S. Watson) Loeve & Loeve		Ruppiaceae	AM, BL
Rydbergia brandegei (T. C. Porter) Rydberg	[Hymenoxys brandegei (T.C. Porter) Parker]	Asteraceae	AL, CT, CU, HF, LP, MZ, SH
Rydbergia grandiflora (Torrey & Gray) Greene	[Hymenoxys grandiflora (Torrey & Gray) Parker]	Asteraceae	AA, BL, CF, CC, DL, EP, GF, GL, GN, HN, JA, LP, LK, LR, ML, PA, PT, RT, SJ, SH, ST
Sabina monosperma (Engelmann) Rydberg	[Juniperus monosperma (Engelmann) Sargent]	Cupressaceae	BA, CU, EP, FN, HF, LA, PW, PE
Sabina osteosperma (Torrey) Antoine	[Juniperus osteosperma (Torrey) Little]	Cupressaceae	AA, DT, EA, GF, GA, LP, ME, MF, MZ, MN, RB, SM
Sabina scopulorum (Sargent) Rydberg	[Juniperus scopulorum Sargent]	Cupressaceae	AL, AA, BA, BL, CF, CC, CN, CT, DT, DG, EA, EL, EP, FN, GF, GA, GN, HF, JA, JF, LP, LR, LA, LN, LO, ME, MF, MZ, MN, OR, PT, PE, RB, RG, RT, SH, SJ, TL, WL
Sabina virginiana (L.) Antoine	[Juniperus virginiana L.]	Cupressaceae	BL, LO, WL, YM
Sagina saginoides (L.) Karsten		Alsinaceae	BL, CF, CC, CN, EA, GF, GL, GA, GN, JA, LR, ME, PA, PT, RT, SM, SJ, ST
Sagittaria cuneata Sheldon		Alismataceae	AM, AL, BA, BL, CN, DG, GF, JA, JF, LR, LA, LN, MF, MZ, MN, RB, RG, SH, WL, YM
Sagittaria graminea Michaux		Alismataceae	LA
Sagittaria latifolia Willdenow		Alismataceae	AM, AH, BL, JF, RT, WL, YM
Sagittaria montevidensis Chamisso & Schlechtendal subsp. calycina (Engelmann) Bogin		Alismataceae	JA
Salicornia europaea L. subsp. rubra (A. Nelson) Breitung		Chenopodiaceae	EA, JA, PA
Salix alba L. var. vitellina (L.) J. Stokes		Salicaceae	JF, RT, WL
Salix amygdaloides Andersson		Salicaceae	AL, BA, BL, CH, DG, EP, EL, JF, KW, LR, LA, LN, LO, ME, MF, MZ, MN, OT, SM, SW, WL, YM
Salix arctica Pallas subsp. petraea (Andersson) Loeve et al.		Salicaceae	AA, BL, CF, CC, CT, DL, EA, GF, GL, GA, GN, HN, JA, LP, LK, LR, ML, OR, PA, PT, SH, SJ, ST
Salix arizonica Dorn		Salicaceae	CN
Salix babylonica L.		Salicaceae
Salix bebbiana Sargent		Salicaceae	AA, BL, CF, CC, CU, DL, DG, EA, EP, GF, GL, GN, GA, JA, JF, LR, LA, ME, ML, MZ, PT, PE, RB, RG, RT, SH, SJ, ST
Salix boothii Dorn		Salicaceae	CN, GA, GN, JA, LK, LR, PA, RB, RT
Salix brachycarpa Nuttall		Salicaceae	AL, BL, CF, CC, CN, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, LP, LK, LR, ME, ML, OR, PA, PT, RG, RT, SM, SJ, ST, TL
Salix calcicola Fernald & Wiegand	[Salix lanata L. subsp. calcicola (Fern. & Wieg.) Hulten]	Salicaceae	GN, PA
Salix candida Fluegge		Salicaceae	CC, LR, PA
Salix discolor Muhlenberg		Salicaceae	LR
Salix drummondiana Barratt		Salicaceae	AL, BL, CC, CU, DT, DL, DG, EA, GF, GL, GA, GN, JA, LK, LP, ME, ML, MN, MZ, PA, PT, RT, SH, SJ, ST
Salix eriocephala Michaux		Salicaceae	LO
Salix exigua Nuttall		Salicaceae	AL, AH, AA, BA, BL, CF, CH, CC, CN, CU, DT, DG, EA, EP, GF, GN, HF, JF, KW, KC, LA, LR, LN, LO, MN, ME, ML, MF, MZ, MN, MR, OT, PT, PE, RB, RG, RT, SH, SM, SW, ST, TL, WL, YM
Salix exigua Nuttall subsp. exigua		Salicaceae
Salix exigua Nuttall subsp. interior (Rowlee) Cronquist	[Salix interior Rowlee]	Salicaceae
Salix fragilis L.		Salicaceae	BL, DV, EP, JF, LR, WL
Salix geyeriana Andersson		Salicaceae	BL, EA, GF, GL, GA, GN, JA, LK, LR, ME, ML, PT, RT, ST
Salix glauca L. var. villosa Andersson		Salicaceae	BL, CU, GL, GA, GN, HN, LR, ME, ML, PA, SJ, ST, TL
Salix gooddingii Ball		Salicaceae	ME
Salix gracilis Andersson		Salicaceae	LR
Salix irrorata Andersson		Salicaceae	AA, BL, DV, DG, EP, JF, LA, PE, MZ
Salix lanata L. subsp. calcicola (Fernald & Wiegand) Hulten		Salicaceae
Salix lasiandra Bentham var. caudata (Nutt.) Sudworth	[Salix lucida Muhlenberg subsp. caudata (Nutt.) Murray]	Salicaceae	AL, BL, CF, CN, CU, DT, DV, DG, EA, EP, GL, GA, GN, JA, JF, LP, LR, ME, ML, MF, MZ, MN, RB, RG, RT, SH, SM, ST
Salix lasiandra Bentham var. lasiandra	[Salix lucida Muhlenberg subsp. lasiandra (Bentham) Murray]	Salicaceae	AA, GN, MZ, SM
Salix ligulifolia Ball	[Salix rigida Muhlenberg var. watsonii (Bebb) Cronquist; Salix eriocephala Michx. var. ligulifolia (Ball) Dorn]]	Salicaceae	AL, BL, CU, DG, EA, EP, GF, GA, GN, JF, LP, LR, ME, ML, MF, MN, RB, RG, RT, SM
Salix lucida Muhlenberg subsp. caudata (Nuttall) E. Murray (see S. lasiandra var. caudata)		Salicaceae
Salix lucida Muhlenberg subsp. lasiandra (Bentham) E. Murray (see S. lasiandra var. lasiandra)		Salicaceae
Salix lutea Nuttall (also see Salix ligulifolia)		Salicaceae	MF
Salix matsudana Koidzumi		Salicaceae	ME
Salix melanopsis Nuttall		Salicaceae	PA, RT
Salix monticola Bebb in Coulter		Salicaceae	AL, AA, BL, CF, CC, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LK, LR, ME, ML, MZ, MN, PA, PT, RB, RT, SJ, SM, ST, TL
Salix myrtillifolia Andersson		Salicaceae	PA
Salix nigra Marshall		Salicaceae	BA
Salix planifolia Pursh		Salicaceae	BL, CF, CC, CU, DT, EA, GF, GL, GA, GN, JA, JF, LP, LR, ME, MF, MZ, PA, PT, RT, SH, SJ, ST
Salix purpurea L.		Salicaceae	BL, DV, EP
Salix reticulata L. subsp. nivalis (Hooker) Loeve et al.	[Salix nivalis Hooker]	Salicaceae	AL, AA, BL, CC, CU, DL, EP, GF, GL, GA, GN, HN, HF, LP, LR, ML, PA, PT, SH, SJ, ST
Salix scouleriana Barratt ex Hooker		Salicaceae	BL, DG, EA, GL, GA, GN, HN, JA, LP, LR, ME, MF, MZ, MN, PA, PT, RB, RT, SH, SJ
Salix serissima (L. H. Bailey) Fernald		Salicaceae	BL, CC, LP, LR, PA, RT
Salix wolfii Bebb		Salicaceae	BL, CC, DL, EA, GF, GL, GA, GN, JA, LK, LR, ML, PA, RB, RT, SJ, ST
Salsola australis R. Brown		Chenopodiaceae	AL, AA, BA, BL, CN, DV, EA, EP, FN, GN, HF, JA, JF,KW, KC, LP, LA, LN, LO, ME, ML, MF, MZ, MN, PE, RT, SW, WL
Salsola collina Pallas		Chenopodiaceae	AM, AH, BA, BL, CH, EP, JF, LR, LN, PE, WN, WL
Salsola paulsenii Litvinov		Chenopodiaceae	MZ
Salvia aethiopis L.		Lamiaceae	BL, MZ
Salvia azurea Michaux & Lamarck var. grandiflora Bentham		Lamiaceae	BL, KW, OT
Salvia nemorosa L.		Lamiaceae	DT, LR, ME, PT
Salvia pratensis L.		Lamiaceae	BL
Salvia reflexa Hornemann		Lamiaceae	BA, BL, CH, CN, DT, DG, EP, JF, KW, KC, LA, LN, LO, ME, MN, OR, RG, SH, SM, SW, WL, YM
Salvia sclarea L.		Lamiaceae	BL
Sambucus canadensis L.		Caprifoliaceae	BL, JF, LA, WL
Sambucus coerulea Rafinesque		Caprifoliaceae	LA, ME, MF, MZ
Sambucus microbotrys Rydberg	[Sambucus racemosa L. subsp. pubens (Michaux) House]	Caprifoliaceae	AL, BL, CC, CN, CU, DT, EA, EP, GF, GL, GA, GN, HF, JA, JF, LK, LR, LA, ME, ML, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SJ, ST
Sanguisorba minor Scopoli		Rosaceae	CH, FN, HF, JF, LA, MZ, MN, PE
Sanicula marilandica L.		Apiaceae	AA, BL, CU, DG, EP, JF, LR, RT
Sapindus drummondii Hooker & Arnott		Sapindaceae	BA, LA
Saponaria officinalis L.		Caryophyllaceae	BL, DG, DV, JF, ME, MZ, PT
Sarcobatus vermiculatus (Hooker) Torrey		Chenopodiaceae	AL, CN, DT, EA, GF, JA, ME, MF, MZ, MN, PE, RB, SH, SM
Sarcostemma crispum Bentham		Asclepiadaceae	FN, LA
Saussurea weberi Hulten		Asteraceae	PA, ST
Saxifraga cernua L.		Saxifragaceae	AL, BL, CF, CC, GN, HN, LP, LK, PA, RT, SM, SJ, ST
Saxifraga hyperborea R. Brown subsp. debilis (Engelmann ex A. Gray) Loeve et al.	[Saxifraga debilis Engelmann ex A. Gray]	Saxifragaceae	AL, BL, CC, DL, EA, GF, GL, GA, GN, LP, LR, ME, PA, PT, SM, SH, SJ, ST
Saxifraga rivularis L.		Saxifragaceae	BL, CC, CU, EP, LR, PA, ST
Schedonnardus paniculatus (Nuttall) Trelease		Poaceae	AM, AH, BA, BN, BL, CH, CW, EP, FN, JF, KW, KC, LR, LA, LN, LO, ME, MZ, OT, SH, SW, TL, WL, YM
Schizachne purpurascens (Torrey) Swallen		Poaceae	AA, BL, DG, EA, EP, LR, RT, SJ
Schizachyrium scoparium (Michaux) Nash	[Andropogon scoparius Michaux]	Poaceae	BA, BN, BL, CH, CN, DT, DL, DG, EP, EL, JF, KC, LR, LA, LN, LO, PE, RG, SM, SW, TL, WN, YM
Schoenocrambe linearifolia (A. Gray) Rollins		Brassicaceae	AL, CN, CT, CU, FN, LA, MZ, PE, SH
Schoenocrambe linifolia (Nuttall) Greene		Brassicaceae	CF, DT, GF, GA, GN, LP, ME, MF, MZ, MN, RB, SM
Schoenoplectus lacustris (L.) Palla	[Scirpus acutus or Scirpus validus or Scirpus lacustris]	Cyperaceae	AL, BA, BL, CH, EP, EL, GA, JA, JF, KW, KC, LR, LA, LN, LO, ME, MF, MZ, MN, RB, RT, SH, SW, WL, YM
Schoenoplectus lacustris (L.) Palla subsp. acutus (Muhlenberg ex Bigelow) Loeve & Loeve	[Scirpus acutus Muhlenberg ex Bigelow]	Cyperaceae
Schoenoplectus lacustris (L.) Palla subsp. creber (Fernald) Loeve & Loeve	[Scirpus lacustris subsp. creber, Scirpus validus var. creber]	Cyperaceae
Schoenoplectus pungens (M. Vahl) Palla	[Scirpus pungens M. Vahl; Scirpus americanus Persoon]	Cyperaceae	AL, AH, BA, BN, BL, CH, CW, EP, EL, GA, JF, KW, LR, LN, LO, ME, MF, MZ, MN, OT, PE, SW, WL, YM
Schoenoplectus saximontanus (Fernald) Raynal	[Scirpus hallii A. Gray]	Cyperaceae	AM, WL
Schrankia occidentalis (Wooton & Standley) Standley		Fabaceae	BA
Schrankia uncinata Willdenow		Fabaceae
Scirpus lineatus Michaux		Cyperaceae	BL
Scirpus microcarpus J. & K. Presl		Cyperaceae	BL, DG, EA, EP, GA, GN, JF, LP, LR, ME, MF, MZ, MN, PE, RG, RT, TL
Scirpus pallidus (Britton) Fernald		Cyperaceae	AM, AA, BA, BL, DT, DG, JF, LR, LA, ME, MF, MN
Sclerocactus glaucus (K. Schumann) L. Benson		Cactaceae	GF, ME, MN
Sclerocactus mesa-verdae (Boissevain & Davidson) L. Benson		Cactaceae	MZ
Sclerocactus parviflorus CLoever & Jotter		Cactaceae	DL, ME, MZ, MN, SM
Sclerochloa dura (L.) P. Beauvois		Poaceae
Scleropogon brevifolius Philippi		Poaceae	PE
Scrophularia lanceolata Pursh		Scrophulariaceae	AM, AL, AA, BL, CU, DL, DG, EP, GL, GA, GN, HF, JF, LP, LR, ME, MZ, MN, RB, RT, TL
Scutellaria brittonii T. C. Porter		Lamiaceae	BL, CU, DG, EP, EL, FN, GF, GL, HF, JF, LR, LA, PE, TL, WL
Scutellaria galericulata L. var. epilobiifolia (Hamilton) Jordal		Lamiaceae	BL, CT, DG, EA, EP, FN, GA, GN, JA, LR, ME, MF, PE, RG, RT, TL, WL
Scutellaria lateriflora L.		Lamiaceae	LN, YM
Scutellaria resinosa Torrey		Lamiaceae	MN
Secale cereale L.		Poaceae	BA, BL, JF, LR, WL
Securigera varia (L.) Lassen		Fabaceae	BL, DT, EP, GL, JF, OR, RB
Sedum acre L.		Crassulaceae	PT
Selaginella densa Rydberg		Selaginellaceae	AL, BA, BL, CC, CU, DT, DG, EP, GF, GL, GA, GN, HN, JA, JF, LP, LR, LA, ME, ML, MF, MZ, MN, PA, RG, RT, SJ, ST
Selaginella mutica D. C. Eaton		Selaginellaceae	BL, DG, EP, FN, HF, JF, LR, LA, ME, MF, MN
Selaginella selaginoides (L.) Link		Selaginellaceae
Selaginella underwoodii Hieronymus		Selaginellaceae	BA, BL, CC, DG, EP, FN, GN, HF, JF, LR, LA, PE, TL
Selaginella weatherbiana Tryon		Selaginellaceae	AL, BL, CC, CU, EP, FN, HF, JF, PA, PE, TL
Senecio atratus Greene		Asteraceae	BL, CF, CC, CN, CU, GF, GA, GN, HN, HF, JA, LK, LR, ML, MZ, OR, PA, PT, SH, SM, SJ, ST
Senecio crassulus A. Gray		Asteraceae	BL, CF, CC, DL, EA, GF, GL, GA, GN, JA, LP, LK, LR, ME, ML, MZ, PA, PT, RG, RT, SH, SM, SJ, ST
Senecio eremophilus Richardson subsp. kingii (Rydberg) Douglas & R.-Douglas		Asteraceae	AL, AA, BL, CC, CN, CT, CU, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LK, LR, ME, ML, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SM, ST, TL, WL
Senecio flaccidus Lessing var. douglasii (DeCandolle) Turner & Barkley	[Senecio longilobus Bentham]	Asteraceae	BA, DT, EP, FN, LA, LP, ME, MZ, MN, OT, PE
Senecio fremontii Torrey & Gray subsp. blitoides (Greene) W. A. Weber		Asteraceae	AL, AA, BL, CF, CC, CU, EA, EP, GF, GL, GA, GN, LP, LK, LR, OR, PA, PT, RG, RT, SH, SM, SJ, ST
Senecio hydrophilus Nuttall		Asteraceae	GA, JA, LR, PA, RT, ST
Senecio integerrimus Nuttall		Asteraceae	BL, CU, DT, DG, EA, EP, EL, GF, GL, GA, GN, JA, JF, LR, LA, LN, ME, MF, MZ, MN, PA, RB, RT, SM, ST
Senecio multicapitatus Greenman in Rydberg		Asteraceae	AL, AA, CN, CT, LP, ME, ML, MF, SH, TL
Senecio rapifolius Nuttall		Asteraceae	BL, JA, LR
Senecio riddellii Torrey & Gray		Asteraceae	BA, CH, KW, KC, LA, LN, MR, PW, WN, YM
Senecio serra Hooker		Asteraceae	EA, GF, GL, GA, GN, JA, LP, LR, ME, MF, MZ, PT, RB, RT, SM, ST
Senecio serra Hooker var. admirabilis (Greene) A. Nelson		Asteraceae
Senecio serra Hooker var. serra		Asteraceae
Senecio spartioides Torrey & Gray		Asteraceae	AM, BL, CC, CU, DL, EP, GA, GN, HF, JA, JF, LR, ML, MZ, MN, OR, SH, TL, WL
Senecio triangularis Hooker		Asteraceae	AA, BL, CN, CU, DT, GF, GL, GA, GN, HN, JA, LP, LK, LR, ME, ML, MZ, PA, RB, RT, PT, SH, SM, SJ, ST
Senecio vulgaris L.		Asteraceae	BL, DV, ME, MR
Senecio wootonii Greene		Asteraceae	AA, BL, CF, CN, CU, DG, EP, FN, GF, GL, GA, GN, HF, JA, JF, LA, ML, MN, OR, PA, PT, SH, SJ, ST
Seriphidium arbusculum (Nuttall) W. A. Weber	[Artemisia arbuscula Nuttall]	Asteraceae	GF, GA, GN, LK, MF, RT
Seriphidium arbusculum (Nuttall) W. A. Weber subsp. longilobum (Osterhout) W. A. Weber	[Artemisia longiloba (Osterhout) Beetle]	Asteraceae
Seriphidium arbusculum (Nuttall) W.A. Weber subsp. arbusculum	[Artemisia arbuscula Nuttall]	Asteraceae
Seriphidium canum (Pursh) W. A. Weber	[Artemisia cana Pursh]	Asteraceae	GA, GN, JA, ME, MF, RT, SH, SM, ST
Seriphidium novum (A. Nelson) W. A. Weber	[Artemisia nova A. Nelson]	Asteraceae	GA, GN, JA, ME, MF, MZ, MN, RB
Seriphidium pygmaeum (A. Gray) W. A. Weber	[Artemisia pygmaea A. Gray]	Asteraceae	MZ, RB
Seriphidium tridentatum (Nuttall) W. A. Weber	[Artemisia tridentata Nuttall]	Asteraceae	BL, CN, DL, DG, GF, GN, JA, LR, ME, MF, MZ, MN, RB, RT
Seriphidium tridentatum (Nuttall) W. A. Weber subsp. wyomingensis (Beetle & Young) W. A. Weber	[Artemisia tridentata Nuttall subsp. wyomingensis Beetle & Young]	Asteraceae
Seriphidium tridentatum (Nuttall) W.A. Weber subsp. tridentatum	[Artemisia tridentata Nuttall]	Asteraceae
Seriphidium tripartitum (Rydberg) W. A. Weber	[Artemisia tripartita Rydberg]	Asteraceae
Seriphidium vaseyanum (Rydberg) W. A. Weber	[Artemisia vaseyana Rydberg]	Asteraceae	BL, CF, CC, CT, GF, GL, GA, GN, JA, LP, LK, LR, ME, MF, MN, RT, ST
Sesuvium verrucosum Rafinesque		Aizoaceae	AL, CW, SH
Setaria glauca (L.) P. Beauvois		Poaceae	AM, BA, BL, CH, KC, LA, LO, ME, SW, WL
Setaria italica (L.) P. Beauvois		Poaceae	BL, DV, LO
Setaria leucopila (Scribner & Merrill) K. Schumann		Poaceae	BA, FN, LA
Setaria verticillata (L.) P. Beauvois		Poaceae	AH, BL, ME
Setaria viridis (L.) P. Beauvois		Poaceae	BA, BL, CH, CN, DT, DV, EP, JF, KW, KC, LP, LN, ME, MF, OT, WN, WL, YM
Shepherdia argentea (Pursh) Nuttall		Elaeagnaceae	AA, BL, DT, EA, GF, LP, LR, MF, MZ, MN, PT, RB, SM
Shepherdia canadensis (L.) Nuttall		Elaeagnaceae	BL, CF, CC, CN, CU, EA, GF, GL, GA, GN, HF, JA, LP, LK, LR, ML, MZ, PA, RB, RG, RT, SH, SJ, ST
Shinnersoseris rostrata (A. Gray) Tomb	[Lygodesmia rostrata (A. Gray) A. Gray]	Asteraceae	AH, CH, EL, EP, KC, LN, MR, PL, SW, WN, WL, YM
Sibbaldia procumbens L.		Rosaceae	AL, BL, CF, CC, DL, EA, EP, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ME, ML, MZ, PA, PT, RT, SH, SM, SJ, ST
Sidalcea candida A. Gray		Malvaceae	AL, AA, BL, CN, CT, CU, DT, DL, GL, GA, GN, HF, JF, LP, LA, LR, ME, MZ, MN, PT, RB, RT
Sidalcea neomexicana A. Gray		Malvaceae	AA, BL, CN, CT, CU, DL, EP, FN, GA, GN, JA, JF, LP, LK, LR, ML, MF, MZ, PT, RB, RT, SH, TL
Silene acaulis (L.) L. subsp. subacaulescens (F. N. Williams) Hitchcock & Maguire		Caryophyllaceae	AA, BL, CC, CU, DL, EA, EP, GF, GL, GA, GN, HF, JA, LP, LK, LR, MZ, PA, PT, RT, SH, SM, SJ, ST
Silene antirrhina L.		Caryophyllaceae	AH, BA, BL, EP, JF, LR, ME, MF, MZ, MN, PE
Silene csereii Baumgartner		Caryophyllaceae	BL
Silene dichotoma Ehrhart		Caryophyllaceae	GN, JF
Silene gallica L.		Caryophyllaceae	AH
Silene noctiflora L.		Caryophyllaceae	BL
Silene scouleri Hooker subsp. hallii (S. Watson) Hitchcock & Maguire		Caryophyllaceae	BL, CC, DT, EA, EP, GF, GL, GA, GN, LP, LK, ME, MZ, PA, RG, RT, SJ, ST
Silene vulgaris (Moench) Garcke		Caryophyllaceae	CF, CU,
Silphium integrifolium Michaux		Asteraceae
Silphium laciniatum L.		Asteraceae	EP
Sinapis alba L.		Brassicaceae
Sinapis arvensis L.		Brassicaceae	BL, DV, EA, GL, GN, LA, ME, MF, MZ, PT, WL
Sisymbrium altissimum L.		Brassicaceae	AA, BA, BL, CF, CN, CT, CU, DT, DV, EP, GF, GA, GN, JA, JF, LP, LR, LN, ME, MF, MZ, MN, PT, RT, SM, SW, WL
Sisymbrium austriacum Jacquin		Brassicaceae	BL
Sisymbrium loeselii L.		Brassicaceae	BL, GF, ME, MZ, RB, SM, TL
Sisymbrium officinale (L.) Scopoli		Brassicaceae
Sisyrinchium demissum Greene		Iridaceae	AA, CN, RG, SH, WL
Sisyrinchium idahoense Bicknell var. occidentale (Bicknell) D. Henderson		Iridaceae	BL, GA, JA, MZ, PE, WL, YM
Sisyrinchium montanum Greene		Iridaceae	AA, BL, CC, CT, CU, DV, DG, EP, GL, GA, GN, JF, LK, LR, LA, ME, ML, MF, PA, PE, RG, RT, ST, TL, WL
Sisyrinchium pallidum Cholewa & Henderson		Iridaceae	LR, PA, SH
Sium suave Walter		Apiaceae	AL, GF, GN, JA, MN, RB, RG, RT
Smelowskia calycina (Stephan ex Willdenow) C. A. Meyer		Brassicaceae	CF, DL, EA, GA, GN, HN, JA, LP, LK, OR, PA, PT, RT, SH, SJ, ST
Smilax lasioneuron Hooker		Smilacaceae	BL, DG, EP, JF, LR, PE
Solanum americanum P. Miller		Solanaceae	BA, BL, DV, LA, MZ, SW, WL, YM
Solanum carolinense L.		Solanaceae	BL
Solanum dulcamara L.		Solanaceae	BL, DV, JF, ME, MZ
Solanum elaeagnifolium Cavanilles		Solanaceae	BA, BL, KW, KC, LA, ME, MZ, OT, PE
Solanum heterodoxum Dunal		Solanaceae	EP
Solanum jamesii Torrey		Solanaceae	AA, BL, LA, MZ
Solanum physalifolium Rusby var. nitidibaccatum (Bitter) Edmonds		Solanaceae	BL, DG, GF, JF, LR, ME, MF, MZ, WL
Solanum rostratum Dunal		Solanaceae	BA, BL, CH, EL, JF, KW, KC, LR, LA, LN, LO, ME, MF, MN, MR, PW, SW, YM
Solanum triflorum Nuttall		Solanaceae	AL, AH, BL, CC, CN, DL, EP, GN, HF, JA, JF, KC, LP, LR, LA, ME, ML, MF, MZ, PW, RB, RG, RT, SH, SW, TL, YM
Solidago canadensis L.	[Solidago altissima L.]	Asteraceae	AA, BL, CT, CW, CU, DT, DV, DG, EA, GL, GA, GN, HF, JA, JF, LR, LA, LO, ME, ML, MF, MZ, MN, PA, PT, PE, RB, RG, RT, SM, SW, TL, WL, YM
Solidago gigantea Aiton	[Solidago serotinoides Loeve & Loeve]	Asteraceae	BA, BN, BL, CH, DL, DG, GA, HF, JF, LA, LN, MF, RT, SM, SW, YM
Solidago missouriensis Nuttall		Asteraceae	BA, BL, CC, CN, CT, CU, DG, EP, JF, LP, LR, LA, LO, PA, SH, SW, TL, WN, WL
Solidago mollis Bartling		Asteraceae	BL, CH, DV, EP, EL, JF, KC, LN, MR, PE, SW, WL, YM
Solidago multiradiata Aiton var. scopulorum A. Gray		Asteraceae	AA, CC, CT, CU, DT, DL, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LK, LR, ME, MZ, PA, PT, RB, RT, SM, SJ, TL
Solidago nana Nuttall		Asteraceae	AH, AA, BA, BL, EP, GA, JF, ME, MF, MZ, TL
Solidago nemoralis Aiton var. longipetiolata (Mackenzie & Bush) Palmer & Steyermark		Asteraceae	BL, EP, JF, LK, MF, MN, TL
Solidago simplex Humboldt, Bonpland, & Kunth var. nana	[Solidago spathulata De Candolle var. nana (A. Gray) Cronquist]	Asteraceae	AL, BL, CF, CC, EA, GL, GF, GA, GN, HN, HF, JA, LP, LR, LK, ME, MZ, PA, SH, SJ, ST
Solidago simplex Humboldt, Bonpland, & Kunth var. simplex	[Solidago spathulata De Candolle var. neomexicana (A. Gray) Cronquist]	Asteraceae	AA, BL, CC, CN, DT, DG, EA, EP, GF, GL, GA, GN, HF, JA, LP, LK, LR, ME, ML, MZ, MN, PA, PT, RG, RT, SH, TL
Solidago spathulata De Candolle var. nana (A. Gray) Cronquist (see S. simplex var. nana)		Asteraceae
Solidago spathulata De Candolle var. neomexicana (A. Gray) Cronquist (see S. simplex var. simplex)		Asteraceae
Solidago speciosa Nuttall var. pallida T. C. Porter		Asteraceae	BL, EP, LR
Solidago velutina De Candolle	[Solidago sparsiflora A. Gray]	Asteraceae	AA, BA, BL, CC, CT, DL, EA, EP, FN, GF, GL, GA, GN, LP, LR, LA, ME, ML, MF, MZ, MN, OR, PT, PW, RB, SH, SM, WL
Solidago wrightii A. Gray var. adenophora S. F. Blake		Asteraceae	BA, DG, LA, PE
Sonchus arvensis L.		Asteraceae	AM, BL, EA, ME, MZ, OR, PE
Sonchus asper (L.) J. Hill		Asteraceae	AH, BA, BL, EA, GF, JF, LR, LN, ME, MF, MZ, OT, OR, PT, SH, WL
Sonchus oleraceus L.		Asteraceae	BA, BL, JF, ME, MF, MN
Sonchus uliginosus Bieberstein		Asteraceae	EA, JF, LR, LN, ME, MF, MN, RB, SH
Sorbus scopulina Greene		Rosaceae	BL, EA, FN, GL, GA, GN, JA, JF, LP, ME, MZ, MN, RB, RT
Sorghastrum avenaceum (Michaux) Nash	[Sorghastrum nutans (L.) Nash, Sorghum nutans (L.) A. Gray]	Poaceae	BA, BL, CH, JF, KC, LR, LA, LN, ME, MN, SM, SW, YM
Sorghum halepense (L.) Persoon		Poaceae	BA, BL, KW, WN
Sorghum vulgare Persoon		Poaceae	KC
Sparganium angustifolium Michaux		Sparganiaceae	AH, BL, DL, EA, EP, GF, GL, GA, GN, JA, LP, ME, MF, MZ, PA, PT, RB, RT, ST
Sparganium emersum Rehmann		Sparganiaceae	EA, GL, GA, GN, LR, MN, YM
Sparganium eurycarpum Engelmann ex A. Gray		Sparganiaceae	AH, DG, LN, RT, YM
Sparganium minimum Wallroth		Sparganiaceae	BL, GA, JA, LR, TL
Spartina gracilis Trinius		Poaceae	AL, CT, MF, MN, PA, SH, WL, YM
Spartina pectinata Link		Poaceae	AH, DV, JF, KC, LN, LO, MF, SW, WL, YM
Spathulata spuria (Bieberstein) Loeve & Loeve		Crassulaceae	MF
Spatularia foliolosa (R. Brown) Small	[Saxifraga foliolosa R. Brown]	Saxifragaceae	CC
Spergula arvensis L.		Alsinaceae	LR
Spergularia marina (L.) Grisebach		Alsinaceae	AM, WL
Spergularia media (L.) K. Presl		Alsinaceae	BL, LR, WL
Spergularia rubra (L.) J. & K. Presl		Alsinaceae	BL, EA, GL, GA, GN, JA, JF, LR, MZ, PT, RT, ST
Spergulastrum lanuginosum Michaux subsp. saxosum (A. Gray) W. A. Weber		Alsinaceae	CN, CU, DL, GA, GN, HF, LP, LK, LR, ML, MZ, OR, PT, SH, SM, SJ, TL
Sphaeralcea angustifolia (Cavanilles) G. Don var. cuspidata A. Gray		Malvaceae	BA, BN, CW, FN, LA, OT, PW, PE
Sphaeralcea coccinea (Pursh) Rydberg		Malvaceae	AL, AA, BA, BN, BL, CF, CH, CN, CT, CW, CU, DT, DV, DL, DG, EA, EP, EL, GF, GA, GN, HF, JA, JF, KW, KC, LP, LR, LA, LN, LO, ME, ML, MF, MZ, MN, MR, OT, PA, PW, PE, RB, RG, SH, SM, SW, ST, WL, YM
Sphaeralcea coccinea (Pursh) Rydberg subsp. coccinea		Malvaceae
Sphaeralcea coccinea (Pursh) Rydberg subsp. dissecta (Nuttall) Kearney		Malvaceae
Sphaeralcea coccinea subsp. elata (E. G. Baker) Kearney		Malvaceae
Sphaeralcea fendleri A. Gray		Malvaceae	AA, LP, MZ
Sphaeralcea leptophylla (A. Gray) Rydberg		Malvaceae	ME, MZ
Sphaeralcea parvifolia A. Nelson		Malvaceae	ME, MF, MZ, MN, SM
Sphaeromeria argentea Nuttall		Asteraceae	MF
Sphaeromeria capitata Nuttall		Asteraceae	MF
Sphaerophysa salsula (Pallas) De Candolle		Fabaceae	AL, CN, CT, DT, SH
Sphenopholis obtusata (Michaux) Scribner		Poaceae	AA, AH, BA, BL, CH, DG, GN, JF, LA, LN, ME, ML, MZ, RB, SH, SJ, WL, YM
Spiraea douglasii Hooker var. menziesii (Hooker) K. Presl		Rosaceae	RT
Spiranthes diluvialis Sheviak		Orchidaceae	BL, JF
Spiranthes romanzoffiana Chamisso		Orchidaceae	BL, CT, EA, GL, GA, GN, JA, LR, ME, ML, MN, PA, RT, SM, SJ, ST, TL
Spirodela polyrhiza (L.) Schleiden		Lemnaceae	GN, MF, RT, YM
Sporobolus airoides (Torrey) Torrey		Poaceae	AL, BN, BL, CH, CC, CW, EP, GN, JF, KW, KC, LA, LN, LO, ME, MF, MZ, MN, OT, PA, PE, RG, SH, SW, WL
Sporobolus asper (Michaux) Kunth		Poaceae	AM, BA, BL, CH, JF, KC, LA, LN
Sporobolus contractus A. S. Hitchcock		Poaceae	AL, ME, RG
Sporobolus cryptandrus (Torrey) A. Gray		Poaceae	AL, AA, BA, BN, BL, CF, CH, CU, DV, DG, EP, FN, JF, KW, KC, LR, LA, LN, LO, ME, MF, MZ, MN, MR, OT, PW, RG, SH, SM, SW, TL, WN, WL, YM
Sporobolus flexuosus (Thurber) Rydberg		Poaceae	ME
Sporobolus giganteus Nash		Poaceae	BA, BN, EP, MZ
Sporobolus heterolepis (A. Gray) A. Gray		Poaceae	BL, DG, EP, JF
Sporobolus neallyi Vasey		Poaceae	BN, LA, PE
Sporobolus neglectus Nash		Poaceae	BA, JF
Sporobolus texanus Vasey		Poaceae
Stachys palustris L. subsp. pilosa (Nuttall) Epling		Lamiaceae	AL, BL, CN, CT, CU, DG, EP, GA, GN, JF, LP, LR, PA, RB, RG, RT, SH, TL, WL
Stanleya albescens Jones		Brassicaceae	DT, ME, MN
Stanleya pinnata (Pursh) Britton		Brassicaceae	BL, DT, EP, FN, GF, HF, JA, KW, LP, LR, LA, ME, MF, MZ, MN, OT, PE, RB, RT, SM
Stanleya pinnata (Pursh) Britton var. integrifolia (James) Rollins		Brassicaceae
Stanleya pinnata (Pursh) Britton var. pinnata		Brassicaceae
Stanleya viridiflora Nuttall		Brassicaceae	MF
Stellaria calycantha (Ledebour) Bongard		Alsinaceae	BL, CC, CN, EA, EP, GA, GF, JF, LP, LR, PT, RB, RT, SJ
Stellaria crassifolia Ehrhart		Alsinaceae	MZ, PA, SH
Stellaria graminea L.		Alsinaceae	BL
Stellaria irrigua Bunge		Alsinaceae	CT, GN, HN, LP, SM, SJ
Stellaria longifolia Muhlenberg ex Willdenow		Alsinaceae	AL, AA, BL, CU, DG, EA, EP, GL, GN, HF, JA, JF, LP, LA, LR, ML, PA, PE, RG, RT, SM, ST, TL
Stellaria longipes Goldie		Alsinaceae	AL, BL, CC, DT, DL, EP, GF, GL, GA, GN, HF, LK, LR, ME, ML, MZ, PA, PT, RG, SM, SJ
Stellaria obtusa Engelmann		Alsinaceae	RB, RT
Stellaria umbellata Turczaninov ex Karilin & Kirilow		Alsinaceae	BL, CF, CC, CU, DT, DL, EA, GF, GL, GA, GN, HN, JA, LP, LR, ME, MZ, MN, PA, PT, RT, SH, SM, SJ, ST
Stenactis strigosa (Muhlenberg ex Willdenow) De Candolle		Asteraceae	BL, DV, JF, LA, LR
Stenogonum flexum (Jones) Reveal & Howell		Polygonaceae	DT, GF, ME, MZ
Stenogonum salsuginosum Nuttall		Polygonaceae	ME, MF, MZ
Stenosiphon linifolius (Nuttall in F. James) Heynhold		Onagraceae	BA, BL
Stenotus acaulis Nuttall		Asteraceae	GF, MF, RB
Stenotus armerioides Nuttall		Asteraceae	DT, EA, GF, GN, LR, LO, ME, MF, MZ, MN, RB, SM, WL
Stephanomeria exigua Nuttall		Asteraceae	ME, MF, MZ
Stephanomeria pauciflora (Torrey) A. Nelson		Asteraceae	AH, BA, BL, CF, CC, DT, EL, JF, KC, LR, LA, LN, ME, MZ, MN, OT, SH, WL
Stephanomeria runcinata Nuttall		Asteraceae	GF, GA, ME, MF, WL
Stephanomeria tenuifolia (Torrey) Hall	[Stephanomeria wrightii A. Gray]	Asteraceae	ME, MZ, MN
Stillingia sylvatica Garden ex L.		Euphorbiaceae	BA
Stipa williamsii Scribner		Poaceae	BL
Streptanthella longirostris (S. Watson) Rydberg		Brassicaceae	MZ
Streptanthus cordatus Nuttall ex Torrey & Gray		Brassicaceae	EA, GN, ME, MZ, MN, SM
Streptopus fassettii Loeve & Loeve	[Streptopus amplexifolius (L.) DC var. chalazatus Fassett]	Uvulariaceae	BL, CU, DG, EA, EP, FN, GF, GL, GA, GN, HF, JA, ME, ML, MZ, MN, PA, PT, RB, RG, RT, SH, SJ, ST, TL
Strophostyles leiosperma (Torrey & Gray) Piper		Fabaceae	BA, CH, YM
Suaeda calceoliformis (Hooker) Moquin		Chenopodiaceae	AL, CU, EA, GN, JA, LR, LN, MF, PA, RG, SH, WL
Suaeda moquinii Torrey		Chenopodiaceae	ME, MF, MZ, RB
Suaeda nigra (Rafinesque) Macbride		Chenopodiaceae	AL, BL, DT, DV, MF, MZ, PE, SH, SW
Subularia aquatica L.		Brassicaceae	LR
Suckleya suckleyana (Torrey) Rydberg		Chenopodiaceae	AM, BL, CH, EL, JF, KC, LN, WL
Sullivantia hapemanii (Coulter & Fisher) Coulter var. purpusii (Brandegee) Soltis	[Sullivantia purpusii (Brandegee) Rosendahl]	Saxifragaceae	EA, GF, GN, MN, RB
Swertia perennis L.		Gentianaceae	AL, BL, CF, CC, CN, CU, DG, EA, EP, GF, GL, GA, GN, JA, HN, LP, LK, LR, ME, ML, MZ, OR, PA, PT, RT, SH, SM, SJ, ST, TL
Swida sericea (L.) Holub	[Cornus stolonifera Michaux]	Cornaceae	AL, AA, BL, CN, CU, DT, DV, DG, EP, GF, GA, GN, JF, LP, LR, ME, ML, MF, MZ, MN, OR, PT, RB, RG, RT, SH, SJ, SM, TL
Symphoricarpos albus (L.) S. F. Blake		Caprifoliaceae	BL, EP, GL, JF, LA
Symphoricarpos longiflorus A. Gray		Caprifoliaceae	MF, MN
Symphoricarpos occidentalis Hooker		Caprifoliaceae	AH, BL, CT, DV, DG, EP, EL, HF, JF, LR, LA, LO, MF, MR, PE, SW, WL
Symphoricarpos rotundifolius A. Gray		Caprifoliaceae	AL, AA, CF, CC, CN, CT, CU, DT, DL, EA, FN, GF, GA, GN, HF, JA, JF, LP, ME, ML, MF, MZ, MN, PA, PT, PE, RB, RG, RT, SH, SM, SJ, ST
Symphytum officinale L.		Boraginaceae	DV, MF
Talinum calycinum Engelmann		Portulacaceae
Talinum parviflorum Nuttall ex Torrey & Gray		Portulacaceae	BA, BN, BL, DV, DG, EP, JF, KC, LA, LN, ME, MF, MZ, MR, RG, TL, WN, WL, YM
Tamarix parviflora De Candolle		Tamaricaceae	BA, ME
Tamarix ramosissima Ledebour		Tamaricaceae	BA, BL, CH, DT, EA, EL, FN, GN, JF, KW, KC, LA, LN, ME, MF, MZ, MN, OT, PW, PE, RB
Tanacetum parthenium (L.) Schultz-Bipontinus		Asteraceae	BL
Tanacetum vulgare L.		Asteraceae	BL, DV, GA, ME, PE, PT
Taraxacum dumetorum Greene		Asteraceae	JA
Taraxacum eriophorum Rydberg		Asteraceae	BL, GA, GN
Taraxacum officinale G. H. Weber ex Wiggers		Asteraceae	AL, AH, BA, BL, CF, DT, DL, EA, EP, EL, GF, GL, GA, GN, HN, HF, JA, JF, KC, LP, LA, LR, LN, ME, MF, MZ, MN, OR, PA, PT, PE, RB, RT, SH, SM, SJ, ST, TL
Taraxacum ovinum Greene		Asteraceae	AL, BL, CF, CC, EA, GA, GN, LK, LR, LA, PA, PT, SJ, ST
Taraxacum scopulorum (A. Gray) Rydberg		Asteraceae	AL, BL, CC, CF, GL, GA, GN, HN, LP, LK, LR, PT, ST
Telesonix jamesii (Torrey) Rafinesque		Saxifragaceae	EP, JF, LR, PA
Teloxys ambrosioides (L.) W. A. Weber		Chenopodiaceae
Teloxys botrys (L.) W. A. Weber		Chenopodiaceae	BL, CF, EP, JF, MZ
Teloxys graveolens (Willdenow) W. A. Weber		Chenopodiaceae	CF, EP, LA, MZ, SH
Tetradymia canescens De Candolle		Asteraceae	CF, CT, CU, GA, GN, HF, JA, LP, LK, LR, ME, ML, MF, MZ, MN, RB, SH, ST, TL, WL
Tetradymia nuttallii Torrey & Gray		Asteraceae	MF, RB
Tetradymia spinosa Hooker & Arnott		Asteraceae	DT, DL, ME, MF, MZ, MN, RB, SM
Tetraneuris acaulis (Pursh) Greene	[Hymenoxys acaulis (Pursh) Parker]	Asteraceae	AL, BA, BN, BL, CN, CU, DV, DL, EP, EL, FN, GF, GN, KW, KC, LR, LA, LN, LO, ME, MF, MR, OT, PW, PE, RB, RG, SH, SW, TL, WN, WL, YM
Tetraneuris brevifolia Greene	[Tetraneuris acaulis (Pursh) Greene var. caespitosa (A. Nelson)]	Asteraceae	AL, BL, CF, CC, CU, GL, GA, GN, HF, LK, LR, PA, SH, ST, TL
Tetraneuris ivesiana Greene	[Hymenoxys acaulis (Pursh) Parker var. ivesiana (Greene) Parker]	Asteraceae	AA, DT, GA, GN, LP, ME, MZ, MN, SM
Tetraneuris scaposa (De Candolle) Greene	[Hymenoxys scaposa (De Candolle) Parker]	Asteraceae	BA, BN, EP, LA, YM
Tetraneuris torreyana (Nuttall) Greene	[Hymenoxys torreyana (Nuttall) Parker]	Asteraceae	GN, ME, MF, MN
Teucrium canadense L. subsp. occidentale (A. Gray) W. A. Weber		Lamiaceae	BL, CN, DV, FN, JF, KW, LP, LR, ME, WL, YM
Teucrium laciniatum Torrey		Lamiaceae	BA, BN, HF, LA, OT, PE
Thalictrum alpinum L.		Thalictraceae	AL, BL, CF, CC, CU, GL, GA, GN, JA, LP, LK, LR, PA, SH, SJ, ST
Thalictrum dasycarpum Fischer & Ave-Lallemant		Thalictraceae	AH, BL, CU, DG, JF, LA, WL
Thalictrum fendleri Engelmann ex A. Gray		Thalictraceae	AL, AA, BL, CF, CC, CN, CT, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, JA, JF, LP, LK, LR, LA, ML, MZ, MN, OR, PA, PT, PE, RB, RG, RT, SH, SM, SJ, ST, TL
Thalictrum heliophilum Wilken & DeMott		Thalictraceae	GF, RB
Thalictrum revolutum De Candolle		Thalictraceae	AA, LP, WL
Thalictrum sparsiflorum Turczaninov ex Fischer & Ave-Lallemant		Thalictraceae	BL, CC, CT, EA, GA, HN, JA, LR, ME, ML, OR, RT
Thalictrum venulosum Trelease		Thalictraceae	GF, GN, JA, RB, RT, SJ
Thamnosma texana (A. Gray) Torrey		Rutaceae
Thelesperma filifolium (Hooker) A. Gray var. intermedium (Rydberg) Shinners		Asteraceae	AM, AL, AH, BA, CU, DG, EP, EL, FN, HF, LA, SW, WL
Thelesperma megapotamicum (Sprengel) Kuntze		Asteraceae	BA, BN, BL, CH, CW, DG, EP, EL, JF, KW, KC, LR, LA, LN, LO, MZ, SW, WN, WL, YM
Thelesperma subnudum A. Gray		Asteraceae	CN, LA, ME, MZ, MN, OT, PE, RG, SM
Thellungiella salsuginea (Pallas) O. E. Schulz		Brassicaceae	PA
Thelypodiopsis aurea (Eastwood) Rydberg		Brassicaceae	MZ, MN
Thelypodiopsis elegans (Jones) Rydberg		Brassicaceae	DT, EA, GF, GN, ME, MF, MN, RB, SM
Thelypodiopsis juniperorum (Payson) Rydberg		Brassicaceae	DT, MN
Thelypodium integrifolium (Nuttall) Endlicher		Brassicaceae	DT, GA, GN, JA, LR, ME, MF, MN, PE, RB, RT, SM, WL
Thelypodium laxiflorum Al-Shehbaz		Brassicaceae	AA, EA, GF, GN, LP, MZ, PT
Thelypodium paniculatum A. Nelson		Brassicaceae	JA
Thelypodium sagittatum (Nuttall) Endlicher subsp. sagittatum		Brassicaceae
Thelypodium wrightii A. Gray subsp. oklahomensis Al-Shehbaz		Brassicaceae	BA, FN, LA
Thermopsis divaricarpa A. Nelson		Fabaceae	AL, BL, CC, CU, DG, EP, GL, GA, GN, JF, LR, LA, ME, PA, RT, TL
Thermopsis montana Nuttall ex Torrey & Gray		Fabaceae	AL, AA, CC, CN, CT, CU, DT, DL, EA, GA, GN, LP, ME, MZ, MN, PA, RB, RG, SH
Thermopsis rhombifolia (Nuttall ex Pursh) Richardson		Fabaceae	BL, DG, EP, EL, HF, JF, LR, LA, LN, LO, MF, SH, WL
Thinopyrum intermedium (Host) Barkworth & Dewey	[Agropyron intermedium (Host) P. Beauvois]	Poaceae	BL, CU, DT, DL, DG, EA, GN, JF, LP, LR, ME, MF, MZ, MN, PT, RT, TL
Thinopyrum intermedium (Host) Barkworth & Dewey subsp. barbulatum (Schur) Barkworth & Dewey	[Agropyron trichophorum (Link) Richter]	Poaceae
Thinopyrum ponticum (Podpera) Barkworth & Dewey	[Agropyron elongatum (Host) P. Beauvois]	Poaceae	BL, CH, GF, JF, KC, LR, ME, MZ, MN
Thlaspi arvense L.		Brassicaceae	AH, BL, CC, CN, DT, DG, EP, GF, GL, GA, GN, HF, JF, KC, LR, LA, LN, LO, ME, MF, MZ, PA, PT, RB, RT, SJ, ST, TL, WL
Thymophylla aurea (A. Gray) Greene	[Dyssodia aurea (A. Gray) A. Nelson]	Asteraceae	BN, CH, CW, EP, LA, LN, OT, PE
Tiquilia nuttallii (Bentham) A. Richard		Ehretiaceae	MF
Tithymalus brachyceras (Engelmann) Small	[Euphorbia robusta (Engelmann) Small]	Euphorbiaceae	AL, AH, AA, BL, CF, CU, DG, EP, GF, GL, GN, HF, JF, LP, LR, ME, ML, MF, MZ, MN, PA, PE, RB, SH, TL, WL
Tithymalus crenulatus (Engelmann in Torrey) Heller	[Euphorbia crenulata Engelmann in Torrey]	Euphorbiaceae
Tithymalus cyparissias (L.) Lamarck	[Euphorbia cyparissias L.]	Euphorbiaceae	RT
Tithymalus esula (L.) Scopoli	[Euphorbia esula L.]	Euphorbiaceae
Tithymalus incisus (Engelmann) W. A. Weber	[Euphorbia incisa Engelmann var. mollis (Norton) L.C. Wheeler]	Euphorbiaceae	MZ
Tithymalus myrsinites (L.) J. Hill	[Euphorbia myrsinites L.]	Euphorbiaceae	BL, JF
Tithymalus peplus (L.) J. Hill	[Euphorbia peplus L.]	Euphorbiaceae	JF
Tithymalus spathulatus (Lamarck) W. A. Weber	[Euphorbia dictyosperma Fischer & Meyer]	Euphorbiaceae	AH, BL, DT, DV, DG, JF, LR, ME, MN, OT
Tithymalus uralensis (Fischer ex Link) Prokhanov	[Euphorbia uralensis Fischer ex Link]	Euphorbiaceae	BL, CU, EP, EL, GL, GN, JF, LR, ME, MF, MR, RB, RT, SH, TL
Tonestus lyallii (A. Gray) A. Nelson	[Haplopappus lyallii A. Gray]	Asteraceae	CC, GA, LR, RT, ST
Tonestus pygmaeus (Torrey & Gray) A. Nelson	[Haplopappus pygmaeus (Torrey & Gray) A. Gray]	Asteraceae	AL, BL, CF, CC, CU, EA, EP, GL, GA, GN, HN, JA, LP, LK, LR, ML, MZ, PA, PT, RG, SM, SJ, ST
Torreyochloa pauciflora (J. Presl in K. Presl) Church	[Glyceria pauciflora J. Presl in K. Presl]	Poaceae	BL, GF, GN, LR, PA, RB, SM, ST
Townsendia annua Beaman		Asteraceae	DT, MZ, MN, SM
Townsendia eximia A. Gray		Asteraceae	CT, HF, LA
Townsendia exscapa (Richardson) T. C. Porter		Asteraceae	AL, AA, BA, CF, EL, GF, GN, LP, LA, LN, LO, ME, MZ, MN, MR, OT, RB, RG, SH, SM, SW, ST, WL, YM
Townsendia fendleri A. Gray		Asteraceae	CF
Townsendia glabella A. Gray		Asteraceae	AA, LP, MZ
Townsendia grandiflora Nuttall		Asteraceae	BL, CF, DG, EP, JF, LR, PA, PE, WL
Townsendia hookeri Beaman		Asteraceae	BL, EP, GN, JF, LR, TL, WL
Townsendia incana Nuttall		Asteraceae	DT, GF, GN, ME, MF, MZ, MN, RB, SM
Townsendia leptotes (A. Gray) Osterhout		Asteraceae	GA, GN, MF, PT, RT, SH
Townsendia montana Jones		Asteraceae
Townsendia rothrockii A. Gray ex Rothrock		Asteraceae	CF, DL, GN, LP, LK, ME, PA, PT, SJ, ST
Townsendia strigosa Nuttall		Asteraceae	MF, MZ, MN
Toxicodendron rydbergii (Small ex Rydberg) Greene	[Rhus rydbergii Small ex Rydberg]	Anacardiaceae	BA, BL, DT, JF, LA, ME, MF, MZ, MN, SW, YM
Toxicoscordion paniculatum (Nuttall) Rydberg	[Zigadenus paniculatus (Nuttall) S. Watson]	Melanthiaceae	DL, GF, ME, MF, MZ, RB, SM
Toxicoscordion venenosum (S. Watson) Rydberg	[Zigadenus gramineus Rydberg)]	Melanthiaceae	BL, DT, JF, LP, LR, LO, ME, MZ, MN, OT, PE, RB, SM, WL
Tradescantia occidentalis (Britton) Smyth var. scopulorum (Rose) Anderson & Woodson		Commelinaceae	AH, BA, BN, BL, CH, DV, DG, EP, EL, FN, JF, KC, LR, LA, LN, LO, MR, SW, WN, WL, YM
Tragia ramosa (Muller-Argoviensis in De Candolle) Torrey		Euphorbiaceae	AA, BL, EP, FN, HF, JF, LP, LA, LR, OT, PE
Tragopogon dubius Scopoli subsp. major (Jacquin) Vollmann		Asteraceae	AA, BA, BL, CH, CU, DG, EA, EP, EL, GF, GA, GN, HF, JA, JF, KW, KC, LP, LR, LA, LO, ME, MF, MZ, MN, PA, PT, PE, RB, RT, SM, ST, TL
Tragopogon porrifolius L.		Asteraceae	AA, BL, EL, JA, JF, LP, ME, PE, RT, SH
Tragopogon pratensis L.		Asteraceae	BL, CU, EP, GN, JF, OR, PA, PT, RT
Trautvetteria caroliniensis (Walter) Vail		Ranunculaceae	AA, CN, LP, SJ
Trianthema portulacastrum L.		Aizoaceae	KW
Tribulus terrestris L.		Zygophyllaceae	BA, BN, BL, CH, CW, DV, DG, EP, GN, HF, JF, KW, KC, LA, LO, ME, PW, SW, WL
Trichophorum pumilum (M. Vahl) Schinz & Thellung	[Scirpus pumilus M. Vahl]	Cyperaceae	PA
Tridens muticus (Torrey) Nash var. elongatus (Buckley) Shinners		Poaceae	BA, BL, FN, LA
Trifolium andinum Nuttall		Fabaceae	MF
Trifolium attenuatum Greene		Fabaceae	AA, CU, DL, HF, LP, LA, ML, OR, PA, SH, SM, SJ
Trifolium brandegei S. Watson		Fabaceae	AA, CN, DL, LP, ML, MZ, RG
Trifolium dasyphyllum Torrey & Gray		Fabaceae	AL, BL, CF, CC, CU, EA, EP, GL, GA, GN, HN, JA, LK, LR, ML, OR, PA, PT, RT, SH, ST, WL
Trifolium fragiferum L.		Fabaceae	BL, EL, KC, LN, ME, WL
Trifolium gymnocarpum Nuttall		Fabaceae	DT, EA, GF, GA, GN, JA, ME, MF, MZ, MN, RB
Trifolium hybridum L.		Fabaceae	AL, BL, CN, DG, EP, GF, GA, GN, HF, JA, JF, LP, LR, ML, MZ, PA, RB, RT, ST, TL
Trifolium kingii S. Watson		Fabaceae	DL, ME, MN, SM
Trifolium nanum Torrey		Fabaceae	AA, BL, CC, CU, EA, EP, GF, GL, GA, GN, HF, JA, LP, LK, LR, OR, PA, PT, RT, SH, SJ, ST
Trifolium parryi A. Gray		Fabaceae	AL, BL, CF, CC, CU, DL, EA, GF, GL, GA, GN, HF, JA, LP, LK, LR, ME, ML, PA, PT, RT, SH, SJ, ST
Trifolium pratense L.		Fabaceae	BL, CU, DG, EA, EP, GL, GA, GN, HF, JF, KC, ME, MZ, PA, PT, RB, RT
Trifolium repens L.		Fabaceae	AL, BL, CF, CN, CU, DT, DG, EA, EP, EL, GF, GL, GA, GN, HF, JF, LP, LR, ME, ML, MF, MZ, MN, PA, PT, RB, RT, SH, SJ, TL
Trifolium rusbyi Greene	[Trifolium longipes Nuttall ex Torrey & Gray]	Fabaceae	CN, DT, DL, GA, GN, JA, LR, ME, ML, MZ, RG, RT, SM
Trifolium rusbyi Greene subsp. reflexum (A. Nelson) Heller & Zohary		Fabaceae
Trifolium rusbyi Greene subsp. rusbyi		Fabaceae
Trifolium salictorum Greene ex Rydberg		Fabaceae	GA, HF, LP, LK, ML, OR, PA, PT, SJ, ST
Trifolium wormskioldii Lehmann		Fabaceae	AL, BA, CN, CT, GL, GN, HF, ML, RG, SH
Triglochin debilis (Jones) Loeve & Loeve	[Triglochin concinna Davy var. debilis (Jones) J.T. Howell]	Juncaginaceae	CU, PA
Triglochin maritima L.		Juncaginaceae	AL, AA, CT, CU, DG, EA, GA, GN, JA, LP, LR, LN, ME, MF, MZ, MN, PA, RB, SH, WL
Triglochin palustris L.		Juncaginaceae	BL, CN, CU, GA, GN, LP, LR, LA, PT, RG, SH, TL
Trillium ovatum Pursh		Trilliaceae	JA, RT
Trimorpha elongata (Ledebour) Vierhapper	[Erigeron elongata Ledebour]	Asteraceae	BL, CC, GL, GA, GN, LP, LR, ME, ML, OR, PA, RT, SH, ST
Trimorpha lonchophylla (Hooker) Nesom	[Erigeron lonchophyllus Hooker]	Asteraceae	AL, BL, CC, CT, CU, GL, GA, GN, HF, JA, LK, LR, ML, MF, PA, RB, SJ, TL, WL
Triodanis holzingeri McVaugh		Campanulaceae	BL
Triodanis leptocarpa (Nuttall) Nieuwland		Campanulaceae	BL, JF
Triodanis perfoliata (L.) Nieuwland		Campanulaceae	AH, BL, CH, JF, LR
Triplasis purpurea (Walter) Chapman		Poaceae	BA, BN, CH, EP, KC, LA, LN, SW, YM
Tripterocalyx carneus (Greene) Galloway var. wootonii (Standley) Galloway		Nyctaginaceae	MZ
Tripterocalyx micranthus (Torrey) Hooker		Nyctaginaceae	AL, AH, BN, CF, CH, CT, HF, LA, LN, MF, MR, OT, PE, SH, WL
Trisetum montanum Vasey		Poaceae	BL, CC, CU, EP, GN, LP, LR, MZ, RG, ST
Trisetum spicatum (L.) Richter		Poaceae	AL, BL, CF, CC, DT, DL, EA, EP, GF, GL, GA, GN, LK, LP, LR, ME, ML, MF, MZ, MN, PA, PT, RG, RT, SJ, ST
Trisetum spicatum (L.) Richter subsp. alaskanum Hulten		Poaceae	BL, DT, DL, EA, GF, GA, GN, LR, ME, ML, MF, MZ, MN, PA, PT, RT, SJ, SM, ST
Trisetum spicatum (L.) Richter subsp. congdonii (Scribner & Merrill) Hulten		Poaceae	AL, BL, CC, CF, DL, EA, EP, GF, GL, GA, GN, HN, JA, LP, LK, LR, ML, PA, PT, SH, SJ, ST
Trisetum spicatum (L.) Richter subsp. molle (Michaux) Hulten (see Trisetum spicatum subsp. alaskanum)		Poaceae
Trisetum wolfii Vasey in Rothrock		Poaceae	BL, CC, DT, EA, GF, GL, GA, JA, LR, PA, PT, RB, RT, SJ
Triteleia grandiflora Lindl.		Alliaceae	MZ
Triticum aestivum L.		Poaceae	BA, BL, JF, MZ, TL
Trollius albiflorus (A. Gray) Rydberg	[Trollius laxus Salisbury var. albiflorus A. Gray]	Helleboraceae	BL, CF, CC, CU, DT, DL, EA, GF, GL, GA, GN, HN, JA, JF, LP, LR, ME, MZ, OR, PA, PT, RG, RT, SH, SM, SJ, ST
Truellum sagittatum (L.) Sojak		Polygonaceae	DG
Tryphane rubella (Wahlenberg) Reichenbach	[Arenaria rubella (Wahl.) J.E. Smith; Minuartia rubella (Wahl.) Graebn.]	Alsinaceae	AL, BL, CU, EA, GA, GL, GN, LP, LR, ML, PA, PT, SH, SJ, ST
Turritis glabra L.	[Arabis glabra (L.) Bernhardi]	Brassicaceae	BL, DT, GN, JF, LR, ME, MF, MN, RT
Typha angustifolia L.		Typhaceae	AM, BL, CH, EL, JF, KW, LN, LO, SJ, SW, WL, YM
Typha domingensis Persoon		Typhaceae	BA, FN, KW, LA, LN
Typha latifolia L.		Typhaceae	AL, AH, AA, BN, BL, DV, EP, GF, GN, JF, LR, LA, LN, ME, MF, MZ, MN, MR, PT, RB, RG, RT, SW, TL, YM
Ulmus pumila L.		Ulmaceae	BA, BL, CH, DL, EP, GF, JF, KW, LR, LN, ME, MN, MZ
Unamia alba (Nuttall) Rydberg		Asteraceae	EP, PA, TL
Urtica gracilis Aiton subsp. gracilis	[Urtica dioica L. var. procera (Muhl.) Weddell]	Urticaceae	BA, BL, CF, CC, CN, CU, DV, DG, GF, GA, GN, HF, JF, LR, LA, ME, ML, MZ, MN, OR, PT, RB, RG, RT, SM, SJ, TL
Urtica gracilis Aiton subsp. holosericea (Nuttall) W. A. Weber		Urticaceae	MF
Utricularia macrorhiza LeConte		Lentibulariaceae	BL, GA, GN, JA, LP, LR, MN, PA, SH
Utricularia minor L.		Lentibulariaceae	BL, JA, LR, PA
Utricularia ochroleuca R. Hartman		Lentibulariaceae	PA
Vaccaria pyramidata Medicus		Caryophyllaceae	AH, BL, GF, JF, MN, RB
Vaccinium cespitosum Michaux		Ericaceae	BL, CC, CN, DT, EA, GF, GL, GA, GN, LP, LR, ME, MN, MZ, OR, PA, PT, RT, SH, SJ, ST
Vaccinium globulare Rydberg		Ericaceae	RT
Vaccinium myrtillus L. subsp. oreophilum (Rydberg) Loeve et al.		Ericaceae	BL, CC, CU, DL, EA, GA, GL, GN, HF, ME, ML, MZ, PA, PT, RB
Vaccinium scoparium Leiberg ex Coville		Ericaceae	BL, CC, EA, GF, GL, GA, JA, PA, PT, RT, SH, ST
Vahlodea atropurpurea (Wahlenberg) E. Fries subsp. paramushirensis (Kudo) Hulten		Poaceae	BL, GL, GA, JA, RT, SJ, ST
Valeriana arizonica A. Gray		Valerianaceae	AL, FN, SH
Valeriana capitata Pallas ex Link subsp. acutiloba (Rydberg) F. G. Meyer		Valerianaceae	BL, CF, CF, CC, CN, CU, DL, DG, EA, EP, GF, GL, GA, GN, HN, HF, JF, LP, LK, ME, ML, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SJ, TL
Valeriana edulis Nuttall		Valerianaceae	AL, AA, BL, CC, CT, CU, DT, DL, EP, GF, GL, GA, GN, HN, JA, LP, LK, LR, ME, ML, MZ, MN, OR, PA, PT, RB, RG, RT, SH, SM, SJ, ST, TL
Valeriana occidentalis Heller		Valerianaceae	DT, DL, EA, GF, GL, GA, GN, JA, LR, ME, RB, RT, ST
Veratrum tenuipetalum Heller		Melanthiaceae	BL, CN, CU, DL, GF, GN, HN, HF, LP, ME, OR, PA, RB, RT, SH, SM, SJ, ST
Verbascum blattaria L.		Scrophulariaceae	BL, JF
Verbascum phlomoides L.		Scrophulariaceae	BL, JF
Verbascum pterocaulon Franchet		Scrophulariaceae	BL
Verbascum thapsus L.		Scrophulariaceae	AH, BA, BL, EP, EL, GN, JF, KC, LP, LR, LA, MF, MZ, MN, PT, RT
Verbena bracteata Lagasca & Rodriguez		Verbenaceae	AL, AA, BA, BN, BL, CH, CN, CT, DT, DV, EP, EL, FN, GF, GN, HF, JF, KW, KC, LP, LR, LA, LN, LO, ME, MF, MZ, MN, OT, RB, RG, SH, SW, WL, YM
Verbena hastata L.		Verbenaceae	AH, BA, BL, DG, JF, KC, LA, LN, LO, PE, WL, YM
Verbena macdougalii Heller		Verbenaceae	AA, CN, LA, ML
Verbena plicata Greene		Verbenaceae	BA, LA
Verbena stricta Ventenat		Verbenaceae	BA, BL, CH, EP, JF, KC, LA, LO, PE, SW, TL, WL, WN, YM
Vernonia baldwinii Torrey subsp. interior (Small) Faust		Asteraceae	AM, BN, YM
Vernonia fasciculata Michaux subsp. corymbosa (Schweinitz) Loeve & Loeve		Asteraceae	SW
Vernonia marginata (Torrey) Rafinesque		Asteraceae	BA, CH, EP
Veronica americana Schweinitz ex Bentham		Scrophulariaceae	AA, BL, CN, CT, CU, DV, DL, DG, EA, EP, GF, GL, GA, GN, HF, JA, JF, LP, LR, LA, ME, ML, MF, MZ, MN, PA, PE, RB, RG, RT, SH, SM, ST, TL
Veronica anagallis-aquatica L.		Scrophulariaceae	BL, CF, DG, GN, JF, LP, LN, ME, RB, SW
Veronica catenata Pennell		Scrophulariaceae	BA, BL, CU, EP, GF, GN, JF, LA, LN, ME, MF, MN, RB, SH, SM, TL, WL, YM
Veronica nutans Bongard		Scrophulariaceae	AL, BL, CF, CC, CU, DL, EA, GF, GL, GA, GN, HN, HF, JA, LP, LK, LR, ML, MZ, OR, PA, PT, RB, RG, RT, SH, SM, SJ, ST
Veronica peregrina L. subsp. xalapensis (Humboldt, Bonpland, & Kunth) Pennell		Scrophulariaceae	AA, BA, BL, CF, CN, DL, DG, EP, GL, GA, GN, HF, JF, KC, LP, LR, LA, ME, ML, MF, MZ, MN, PE, RG, RT, TL, WL
Veronica scutellata L.		Scrophulariaceae	GA, RT
Veronicastrum serpyllifolium L. subsp. humifusum (Dickson) W. A. Weber		Scrophulariaceae	BL, CF, CC, CN, CU, DT, DG, EA, GF, GL, GN, GA, HF, JA, LR, LP, LA, ME, MZ, PA, PT, PE, RB, RT, SH, SM, ST
Vexibia nuttalliana (B. Turner) W. A. Weber	[Sophora nuttalliana B. Turner]	Fabaceae	AH, AA, BA, BL, CF, CH, CW, EP, FN, KW, KC, LR, LA, LN, LO, ME, MN, MR, OT, PW, PE, SH, SM, SW, WL, YM
Viburnum edule (Michaux) Rafinesque		Caprifoliaceae	BL, DG, EP, GA, JA, JF, LR, PA
Viburnum lantana L.		Caprifoliaceae	BL, LA
Viburnum lentago L.		Caprifoliaceae	BL, JF
Vicia americana Muhlenberg ex Willdenow		Fabaceae	AL, AH, AA, BL, CN, CU, DT, DL, DG, EA, EP, EL, GF, GA, GN, HF, JA, JF, KW, KC, LP, LR, LA, LN, ME, ML, MZ, MN, OT, PA, PT, PE, RB, RG, RT, SH, SJ, SM, SW, ST, TL, WN, WL
Vicia americana Muhlenberg ex Willdenow var. americana		Fabaceae
Vicia americana Muhlenberg var. minor Hooker		Fabaceae
Vicia angustifolia L.		Fabaceae	AL, CN, CT
Vicia ludoviciana Nuttall var. texana (Torrey & Gray) Shinners		Fabaceae	BL, DT, FN, JF, LA, MZ, OT
Vicia villosa Roth		Fabaceae	AM, BL, CC, CU, DG, LP, ME, MZ, SM
Viola adunca J. E. Smith		Violaceae	AA, BL, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, HF, JF, LP, ME, ML, MF, MZ, MN, OR, PA, RB, RG, RT, SH, SM, ST
Viola biflora L.		Violaceae	AL, BL, CC, CU, DG, EP, GL, GA, JF, LR, PA, TL
Viola kitaibeliana Roemer & Schultes var. rafinesquei (Greene) Fernald		Violaceae	BL
Viola labradorica Schrank		Violaceae	AL, BL, CC, EA, GF, GL, GA, GN, HN, HF, LP, LK, LR, ME, ML, MZ, OR, PA, PT, RT, SH, SJ, ST
Viola macloskeyi Lloyd subsp. pallens (Banks ex De Candolle) M. S. Baker		Violaceae	BL, CF, CN, DT, GF, GL, GA, GN, JA, LA, ML, PA, RB, RG, RT, SJ
Viola nuttallii Pursh		Violaceae	AH, AA, BA, BL, DV, EA, EP, GF, JA, JF, KC, LR, LA, LO, ME, OT, SW, ST, WL
Viola odorata L.		Violaceae	BL
Viola pedatifida G. Don		Violaceae	AA, BL, CU, DG, EP, JF, LA
Viola praemorsa Douglas ex Lindley		Violaceae	BL, EA, GF, GL, GA, GN, ME, MF, MN, RT
Viola praemorsa Douglas ex Lindley subsp. linguifolia (Nuttall) Baker & Clausen		Violaceae
Viola praemorsa Douglas ex Lindley subsp. major (Hooker) M. S. Baker		Violaceae
Viola purpurea Kellogg subsp. venosa (S. Watson) Baker & Clausen		Violaceae	RT
Viola renifolia A. Gray var. brainerdii (Greene) Fernald		Violaceae	BL, CN, DG, EA, GA, JA, LR, PA
Viola rydbergii Greene		Violaceae	BL, CU, DT, DL, DG, EA, EP, GF, GL, GA, GN, JF, LP, LR, LA, ME, MZ, PT, PE, RT, SM
Viola scopulorum (A. Gray) Greene		Violaceae	AL, AA, BL, CN, CU, DT, DL, DG, EA, EP, FN, GF, GL, GA, GN, HF, JA, JF, LR, LA, ML, MZ, MN, OR, PA, PE, RB, RG, RT, SH, SM, SJ
Viola selkirkii Pursh ex Goldie		Violaceae	DG, LR
Viola sheltonii Torrey		Violaceae	DT, ME, MN
Viola sororia Willdenow		Violaceae	AH, BA, BL, CC, CN, CU, DV, DG, EP, GA, GN, HF, JF, LR, LA, ML, MZ, PA, RG, SJ, WL
Viola sororia Willdenow var. affinis (Le Conte) McKinney		Violaceae
Viola sororia Willdenow var. sororia		Violaceae
Viola utahensis Baker & Clausen		Violaceae	MF
Viola vallicola A. Nelson		Violaceae	AA, DT, GF, GN, LR, ME, MN, RB
Virgulaster ascendens (Lindley ex Hooker) Semple	[Aster ascendens Lindley in Hooker]	Asteraceae	AL, AA, BL, CC, CT, DT, EA, EP, FN, GF, GL, GA, GN, JA, LP, LR, ME, ML, MF, MZ, MN, PA, PT, RB, RG, RT, SM, ST, TL, WL
Virgulus amethystinus (Nuttall) Reveal & Keener	[Aster amethystinus Nuttall]	Asteraceae
Virgulus campestris (Nuttall) Reveal & Keener	[Aster campestris Nuttall]	Asteraceae	GA, RT, ST
Virgulus ericoides (L.) Reveal & Keener	[Aster ericoides L.]	Asteraceae	BA, BN, BL, CH, CN, CU, DG, EL, GA, KC, LR, LN, MZ, RB, SH, WL
Virgulus falcatus (Lindley) Reveal & Keener	[Aster falcatus Lindley]	Asteraceae	AL, AA, BN, BL, CH, CN, CT, CW, DV, DG, EP, GA, JF, KC, LP, LR, LA, LN, MF, MZ, MN, MR, PE, SM, TL, WL, YM
Virgulus fendleri (A. Gray) Reveal & Keener	[Aster fendleri A. Gray]	Asteraceae	BL, EP, JF, LR, LA, LN, OT
Virgulus novae-angliae (L.) Reveal & Keener	[Aster novae-angliae L.]	Asteraceae	BL, CU, DV, EA, EP, JF
Virgulus oblongifolius (Nuttall) Reveal & Keener	[Aster oblongifolius Nuttall]	Asteraceae	LA
Viticella orientalis (L.) W. A. Weber		Ranunculaceae	BL, CC, GF, GL, MF, MN, OR
Vitis acerifolia Rafinesque	[Vitis riparia Michaux subsp. longii (Prince) D. Rogers ined.]	Vitaceae	BA, LA, OT
Vitis riparia Michaux subsp. riparia		Vitaceae	AH, BL, FN, JF, LO, PE, YM
Vulpia bromoides (L.) S.F. Gray		Poaceae	MZ
Vulpia octoflora (Walter) Rydberg	[Festuca octoflora Walter]	Poaceae	BA, BL, DG, EL, HF, JF, KC, LR, LA, LN, LO, ME, MF, MZ, MN, MR, PE, SM, SW, WL
Wolffia borealis (Engelmann) Landolt		Lemnaceae	YM
Wolffia columbiana Karsten		Lemnaceae	YM
Woodsia neomexicana Windham		Dryopteridaceae	LP, LA, OR
Woodsia oregana D. C. Eaton subsp. oregana		Dryopteridaceae
Woodsia oregana Eaton		Dryopteridaceae	AL, BA, BL, EP, GF, GN, LA, ME, ML, MF, MN, OR, SH, TL, WN, WL
Woodsia oregana subsp. cathcartiana (Robinson) Windham		Dryopteridaceae
Woodsia plummerae Lemmon		Dryopteridaceae	BA, LP, LA, SH
Woodsia scopulina D. C. Eaton		Dryopteridaceae	BL, EP, GA, JF, LR, ML, RT, TL
Woodsia x schaackii Windham		Dryopteridaceae	OR
Wyethia amplexicaulis (Nuttall) Nuttall		Asteraceae	GA, GN, JA, MF, RB, RT
Wyethia arizonica A. Gray		Asteraceae	AA, GN, LP, MZ, MN, RT, SM
Wyethia magna A. Nelson ex W. A. Weber		Asteraceae	GF, GA, GN, ME, MN, RT, ST
Wyethia scabra Hooker var. canescens W. A. Weber		Asteraceae
Wyethia scabra Hooker var. scabra		Asteraceae	MF
Xanthium strumarium L.		Asteraceae	AM, AH, BA, BL, CH, EP, EL, JF, KW, KC, LR, LA, LN, LO, ME, MF, MZ, PE, SW, WL
Ximenesia encelioides Cavanilles	[Verbesina encelioides (Cav.) Benth. & Hook.]	Asteraceae	AM, AL, AA, BA, BL, CH, CN, CT, CW, DV, EP, EL, FN, GA, GN, JF, LR, LA, LN, ML, MF, MZ, MN, PE, RG, SH, TL, WL
Xylorhiza glabriuscula Nuttall		Asteraceae	MF
Xylorhiza venusta (Jones) Heller		Asteraceae	DT, GF, ME, MF, MN, RB
Yucca baccata Torrey		Agavaceae	AA, LP, MZ, MN, SM
Yucca glauca Nuttall in Fraser		Agavaceae	AH, BA, BL, CH, CN, CU, DV, EA, EP, FN, JF, KC, LR, LA, LN, LO, ML, SW, TL, WL, YM
Yucca harrimaniae Trelease		Agavaceae	AA, DT, EA, GN, LP, ME, MZ, MN, SM
Zannichellia palustris L.		Zannichelliaceae	BA, BL, DV, GF, JF, KC, LA, LN, ME, MF, MN, OR, RT, WL
Zinnia grandiflora Nuttall		Asteraceae	BA, CH, CW, EP, FN, HF, LA, LN, OT, PE
Zizia aptera (A. Gray) Fernald		Apiaceae	CU, JA, PA
Zosterella dubia (Jacquin) Small		Pontederiaceae	YM
Zuckia brandegei (A. Gray) Welsh & Stutz		Chenopodiaceae	GF, ME, MF, MZ
Zygophyllidium hexagonum (Nuttall) Small		Euphorbiaceae	KC, LO, SW, WN, YM