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,