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Plant List
Indexed Alphabetically by Common Name
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For a list of plants indexed by Scientific Name, click here
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| National Common Name | Scientific Name with Author | Symbol | Family | |
| abata cola | Cola acuminata (Beauv.) Schott & Endl. | COAC4 | Sterculiaceae | |
| abelia | Abelia R. Br. | ABELI | Caprifoliaceae | |
| abietenella moss | Abietinella C. Müll. | ABIET | Thuidiaceae | |
| abietinella moss | Abietinella abietina (Hedw.) Fleisch. | ABAB70 | Thuidiaceae | |
| aboriginal saltbush | Atriplex vesicaria Heward ex Benth. | ATVE | Chenopodiaceae | |
| Abrams' allium | Allium abramsii (Ownbey & Aase) McNeal | ALAB2 | Liliaceae | |
| Abrams' sandmat | Chamaesyce abramsiana (L.C. Wheeler) Koutnik | CHAB2 | Euphorbiaceae | |
| abrothallus lichen | Abrothallus De Not. | ABROT | Uncertain Lichen Family | |
| abruptbeak sedge | Carex abrupta Mackenzie | CAAB2 | Cyperaceae | |
| abrus | Abrus Adans. | ABRUS | Fabaceae | |
| absconditella lichen | Absconditella Vezda | ABSCO | Stictidaceae | |
| absinthium | Artemisia absinthium L. | ARAB3 | Asteraceae | |
| Abyssinian myrrh | Commiphora habessinica (Berg) Engler | COHA4 | Burseraceae | |
| Abyssinian oat | Avena abyssinica Hochst. | AVAB | Poaceae | |
| acacia | Acacia ampliceps Maslin | ACAM9 | Fabaceae | |
| acacia | Acacia glauca (L.) Moench | ACGL4 | Fabaceae | |
| acacia | Acacia ligulata Benth. | ACLI8 | Fabaceae | |
| acacia | Acacia P. Mill. | ACACI | Fabaceae | |
| acacia | Acacia rehmanniana Schinz | ACRE8 | Fabaceae | |
| acacia | Acacia sclerosperma F. Muell. | ACSC10 | Fabaceae | |
| acacia | Acacia sophorae (Labill.) R.Br. | ACSO4 | Fabaceae | |
| acaena | Acaena Mutis ex L. | ACAEN | Rosaceae | |
| acanthus | Acanthus ebracteatus Vahl | ACEB3 | Acanthaceae | |
| acanthus | Acanthus L. | ACANT7 | Acanthaceae | |
| Acapulco grass | Bouteloua dimorpha J.T. Columbus | BODI6 | Poaceae | |
| acaulon moss | Acaulon C. Müll. | ACAUL | Pottiaceae | |
| acaulon moss | Acaulon muticum (Hedw.) C. Müll. | ACMU5 | Pottiaceae | |
| acaulon moss | Acaulon muticum (Hedw.) C. Müll. var. muticum (Jaeg.) Crum | ACMUM | Pottiaceae | |
| acaulon moss | Acaulon muticum (Hedw.) C. Müll. var. rufescens (Jaeg.) Crum | ACMUR | Pottiaceae | |
| acaulon moss | Acaulon triquetrum (Spruce) C. Müll. | ACTR4 | Pottiaceae | |
| achiotillo | Alchornea latifolia Sw. | ALLA | Euphorbiaceae | |
| achlys | Achlys DC. | ACHLY | Berberidaceae | |
| achotillo | Caryocar amygdaliferum Mutis | CAAM28 | Caryocaraceae | |
| achyronychia | Achyronychia Torr. & Gray | ACHYR3 | Caryophyllaceae | |
| acicarpha | Acicarpha Juss. | ACICA | Calyceraceae | |
| acidanthera | Acidanthera Hochstetter | ACIDA | Iridaceae | |
| acinos | Acinos P. Mill. | ACINO | Lamiaceae | |
| acisanthera | Acisanthera P. Br. | ACISA | Melastomataceae | |
| Ackerman's milkvetch | Astragalus ackermanii Barneby | ASAC5 | Fabaceae | |
| acnistus | Acnistus Schott | ACNIS | Solanaceae | |
| acroceras | Acroceras amplectens Stapf | ACAM8 | Poaceae | |
| acroceras | Acroceras Stapf | ACROC4 | Poaceae | |
| acrocomia | Acrocomia Mart. | ACROC | Arecaceae | |
| acrocordia lichen | Acrocordia A. Massal. | ACROC3 | Monoblastiaceae | |
| acrocordia lichen | Acrocordia cavata (Ach.) R. C. Harris | ACCA18 | Monoblastiaceae | |
| acrocordia lichen | Acrocordia conoidea (Fr.) Korber | ACCO12 | Monoblastiaceae | |
| acrocordia lichen | Acrocordia gemmata (Ach.) A. Massal. | ACGE5 | Monoblastiaceae | |
| acrocordia lichen | Acrocordia megalospora (Fink) R. C. Harris | ACME4 | Monoblastiaceae | |
| acroporium moss | Acroporium Mitt. | ACROP2 | Sematophyllaceae | |
| actinidia | Actinidia Lindl. | ACTIN3 | Actinidiaceae | |
| actinostachys | Actinostachys Wallich | ACTIN | Schizaeaceae | |
| acuba | Aucuba Thunb. | AUCUB | Cornaceae | |
| acuminate brachythecium moss | Brachythecium acuminatum (Hedw.) Aust. | BRAC3 | Brachytheciaceae | |
| acute blindia moss | Blindia acuta (Hedw.) Bruch & Schimp. in B.S.G. | BLAC70 | Seligeriaceae | |
| acute brachythecium moss | Brachythecium acutum (Mitt.) Sull. | BRAC4 | Brachytheciaceae | |
| acute Indian paintbrush | Castilleja hispida Benth. ssp. acuta Pennell | CAHIA2 | Scrophulariaceae | |
| acutetip aulacomnium moss | Aulacomnium acuminatum (Lindb. & Arnell) Kindb. | AUAC70 | Aulacomniaceae | |
| acutetip cup lichen | Cladonia acuminata (Ach.) Norrlin | CLAC60 | Cladoniaceae | |
| Adam and Eve | Aplectrum hyemale (Muhl. ex Willd.) Torr. | APHY | Orchidaceae | |
| Adam and Eve | Aplectrum Torr. | APLEC | Orchidaceae | |
| Adams' manzanita | Arctostaphylos glandulosa Eastw. ssp. adamsii (Munz) Munz | ARGLA2 | Ericaceae | |
| adansonia | Adansonia L. | ADANS2 | Bombacaceae | |
| Addison's leather flower | Clematis addisonii Britt. | CLAD | Ranunculaceae | |
| adelolecia lichen | Adelolecia Hertel & Hafellner | ADELO | Bacidiaceae | |
| adelolecia lichen | Adelolecia pilati (Hepp) Hertel & Hafellner | ADPI2 | Bacidiaceae | |
| adequate spike lichen | Calicium adequatum Nyl. | CAAD3 | Caliciaceae | |
| adlumia | Adlumia Raf. ex DC. | ADLUM | Fumariaceae | |
| adorned hawthorn | Crataegus compta Sarg. | CRCO7 | Rosaceae | |
| adoxa | Adoxa L. | ADOXA | Adoxaceae | |
| Adriatic bellflower | Campanula garganica Ten. | CAGA9 | Campanulaceae | |
| aeginetia | Aeginetia L. | AEGIN | Orobanchaceae | |
| aegle | Aegle Corr. Serr. | AEGLE | Rutaceae | |
| aeonium | Aeonium Webb & Berth. | AEONI | Crassulaceae | |
| aerva | Aerva Forssk. | AERVA | Amaranthaceae | |
| aerva | Aerva lanata (L.) A. L. Juss. ex Schultes | AELA | Amaranthaceae | |
| aesandra | Aesandra butyracea (Roxb.) Baehni | AEBU2 | Sapotaceae | |
| aesandra | Aesandra Pierre | AESAN | Sapotaceae | |
| aethusa | Aethusa L. | AETHU | Apiaceae | |
| aframomum | Aframomum Schumann | AFRAM | Zingiberaceae | |
| African amaranth | Amaranthus muricatus (Gillies ex Moq.) Gillies ex Hieron. | AMMU3 | Amaranthaceae | |
| African asparagus | Asparagus africanus Lam. | ASAF | Liliaceae | |
| African asparagus fern | Asparagus asparagoides (L.) Druce | ASAS4 | Liliaceae | |
| African Bermudagrass | Cynodon nlemfuensis Vanderyst | CYNL80 | Poaceae | |
| African Bermudagrass | Cynodon nlemfuensis Vanderyst var. nlemfuensis | CYNLN | Poaceae | |
| African Bermudagrass | Cynodon nlemfuensis Vanderyst var. robustus W.D. Clayton & Harlan | CYNLR | Poaceae | |
| African caper | Capparis tomentosa Lam. | CATO23 | Capparaceae | |
| African cornflag | Chasmanthe floribunda (Salisb.) N.E. Br. | CHFL9 | Iridaceae | |
| African cornflag | Chasmanthe N.E. Br. | CHASM2 | Iridaceae | |
| African daisy | Arctotis stoechadifolia Berg. | ARST2 | Asteraceae | |
| African dayflower | Commelina nigritana Benth. | CONI4 | Commelinaceae | |
| African dodder | Cuscuta cassytoides Nees ex Engelm. | CUCA5 | Cuscutaceae | |
| African dogstooth grass | Cynodon transvaalensis Burtt-Davy | CYTR | Poaceae | |
| African horned cucumber | Cucumis metuliferus E. Mey. ex Naud. | CUME3 | Cucurbitaceae | |
| African mahogany | Afzelia africana Smith ex Pers. | AFAF | Fabaceae | |
| African milkweed | Asclepias fruticosa L. | ASFR13 | Asclepiadaceae | |
| African plume | Bauhinia galpinii N.E. Br. | BAGA | Fabaceae | |
| African rattlebox | Crotalaria saltiana Andr. | CRSA8 | Fabaceae | |
| African star apple | Chrysophyllum delevoyi De Wild. | CHDE16 | Sapotaceae | |
| african teak | Chlorophora excelsa (Welw.) Benth. | CHEX5 | Moraceae | |
| african teak | Chlorophora Gaud. | CHLOR4 | Moraceae | |
| African-lily | Agapanthus praecox Willd. | AGPR5 | Liliaceae | |
| Afzel's calymperes moss | Calymperes afzelii Sw. | CAAF3 | Calymperaceae | |
| agapanthus | Agapanthus L'Hér. | AGAPA2 | Liliaceae | |
| agathis | Agathis Salisb. | AGATH2 | Araucariaceae | |
| agathosma | Agathosma Willd. | AGATH3 | Rutaceae | |
| agave | Agave L. | AGAVE | Agavaceae | |
| agdestis | Agdestis Moc. & Sessé ex DC. | AGDES2 | Phytolaccaceae | |
| aglaonema | Aglaonema Schott | AGLAO | Araceae | |
| agonimia lichen | Agonimia tristicula (Nyl.) Zahlbr. | AGTR8 | Verrucariaceae | |
| agonimia lichen | Agonimia Zahlbr. | AGONI | Verrucariaceae | |
| agoseris | Agoseris Raf. | AGOSE | Asteraceae | |
| agrestia lichen | Agrestia J. W. Thomson | AGRES2 | Hymeneliaceae | |
| agrimony | Agrimonia L. | AGRIM | Rosaceae | |
| agropogon | ×Agropogon Fourn. | AGROP3 | Poaceae | |
| aguinaldo blanco | Convolvulus nodiflorus Desv. | CONO | Convolvulaceae | |
| agyrium lichen | Agyrium Fr. | AGYRI | Agyriaceae | |
| agyrium lichen | Agyrium rufum (Pers.) Fr. | AGRU3 | Agyriaceae | |
| 'ahakea | Bobea Gaud. | BOBEA | Rubiaceae | |
| 'ahakea | Bobea timonioides (Hook. f.) Hbd. | BOTI | Rubiaceae | |
| 'ahakea lau nui | Bobea elatior Gaud. | BOEL3 | Rubiaceae | |
| ahtiana lichen | Ahtiana Goward | AHTIA | Parmeliaceae | |
| ahtiana lichen | Ahtiana sphaerosporella (Mull. Arg.) Goward | AHSP | Parmeliaceae | |
| 'aiakanene | Coprosma ernodeoides Gray | COER3 | Rubiaceae | |
| Aiken hawthorn | Crataegus dispar Beadle | CRDI3 | Rosaceae | |
| ailanthus | Ailanthus Desf. | AILAN | Simaroubaceae | |
| aiphanes | Aiphanes Willd. | AIPHA | Arecaceae | |
| aji | Capsicum baccatum L. var. pendulum (Willd.) Eshb. | CABAP | Solanaceae | |
| aji | Capsicum chinense Jacq. [excluded] | CACH30 | Solanaceae | |
| akee | Blighia sapida Koenig | BLSA2 | Sapindaceae | |
| 'akoko | Chamaesyce arnottiana (Endl.) O.& I. Deg. | CHAR17 | Euphorbiaceae | |
| akolea | Athyrium microphyllum (J. Sm.) Alston | ATMI | Dryopteridaceae | |
| 'aku | Cyanea angustifolia (Cham.) Hbd. | CYAN6 | Campanulaceae | |
| 'aku 'aku | Cyanea tritomantha Gray | CYTR6 | Campanulaceae | |
| 'akupa | Bobea brevipes Gray | BOBR3 | Rubiaceae | |
| Alabama croton | Croton alabamensis E.A. Sm. ex Chapman | CRAL3 | Euphorbiaceae | |
| Alabama croton | Croton alabamensis E.A. Sm. ex Chapman var. alabamensis | CRALA | Euphorbiaceae | |
| Alabama croton | Croton alabamensis E.A. Sm. ex Chapman var. texensis Ginzbarg | CRALT | Euphorbiaceae | |
| Alabama hawthorn | Crataegus vulsa Beadle | CRVU | Rosaceae | |
| Alabama leather flower | Clematis socialis Kral | CLSO3 | Ranunculaceae | |
| Alabama lipfern | Cheilanthes alabamensis (Buckl.) Kunze | CHAL5 | Pteridaceae | |
| Alabama serviceberry | Amelanchier arborea (Michx. f.) Fern. var. alabamensis (Britt.) G.N. Jones | AMARA3 | Rosaceae | |
| Alabama supplejack | Berchemia scandens (Hill) K. Koch | BESC | Rhamnaceae | |
| Alabama swamp flatsedge | Cyperus ligularis L. | CYLI | Cyperaceae | |
| Aladdin's slippers | Astragalus amphioxys Gray var. vespertinus (Sheldon) M.E. Jones | ASAMV | Fabaceae | |
| Alameda County thistle | Cirsium quercetorum (Gray) Jepson | CIQU2 | Asteraceae | |
| Alameda manzanita | Arctostaphylos pallida Eastw. | ARPA21 | Ericaceae | |
| Alaska arnica | Arnica unalaschcensis Less. | ARUN | Asteraceae | |
| Alaska brome | Bromus sitchensis Trin. | BRSI | Poaceae | |
| Alaska brownish sedge | Carex brunnescens (Pers.) Poir. ssp. alaskana Kalela | CABRA2 | Cyperaceae | |
| Alaska cedar | Cupressus nootkatensis D. Don | CUNO | Cupressaceae | |
| Alaska Indian paintbrush | Castilleja unalaschcensis (Cham. & Schlecht.) Malte | CAUN4 | Scrophulariaceae | |
| Alaska orache | Atriplex alaskensis S. Wats. | ATAL | Chenopodiaceae | |
| Alaska springbeauty | Claytonia sarmentosa C.A. Mey. | CLSA2 | Portulacaceae | |
| Alaska wormwood | Artemisia alaskana Rydb. | ARAL5 | Asteraceae | |
| Alaskan bugseed | Corispermum ochotense Ignatov var. alaskanum Mosyakin | COOCA | Chenopodiaceae | |
| Alaskan cup lichen | Cladonia alaskana A. Evans | CLAL60 | Cladoniaceae | |
| Alaskan giant shield lichen | Cetrelia alaskana (C. Culb. & Culb.) Culb. & C. Culb. | CEAL9 | Parmeliaceae | |
| alaweo | Chenopodium oahuense (Meyen) Aellen | CHOA | Chenopodiaceae | |
| albahaca | Celosia virgata Jacq. | CEVI4 | Amaranthaceae | |
| albaida | Anthyllis cytisoides L. | ANCY3 | Fabaceae | |
| Albany hawthorn | Crataegus furtiva Beadle | CRFU3 | Rosaceae | |
| Albertville hawthorn | Crataegus mendosa Beadle | CRME | Rosaceae | |
| albizia | Albizia Durazz. | ALBIZ | Fabaceae | |
| albizia | Albizia ferruginea (Guillemin & Perrottet) Benth. | ALFE | Fabaceae | |
| albizia | Albizia odoratissima (L. f.) Benth. | ALOD | Fabaceae | |
| albizia | Albizia zygia (DC.) Macbr. | ALZY | Fabaceae | |
| alchornea | Alchornea Sw. | ALCHO | Euphorbiaceae | |
| alchorneopsis | Alchorneopsis Muell.-Arg. | ALCHO2 | Euphorbiaceae | |
| alder | Alnus P. Mill. | ALNUS | Betulaceae | |
| alderleaf mountain mahogany | Cercocarpus montanus Raf. | CEMO2 | Rosaceae | |
| alderleaf mountain mahogany | Cercocarpus montanus Raf. var. montanus | CEMOM4 | Rosaceae | |
| alectra | Alectra Thunb. | ALECT2 | Scrophulariaceae | |
| alectryon | Alectryon Gaertn. | ALECT | Sapindaceae | |
| alena | Boerhavia herbstii Fosberg | BOHE2 | Nyctaginaceae | |
| aleurites | Aleurites J.R. & G. Forst. | ALEUR | Euphorbiaceae | |
| Aleutian brome | Bromus aleutensis Trin. ex Griseb. | BRAL6 | Poaceae | |
| Aleutian chickweed | Cerastium aleuticum Hultén | CEAL | Caryophyllaceae | |
| Aleutian cress | Aphragmus eschscholtzianus Andrz. ex DC. | APES | Brassicaceae | |
| Aleutian maidenhair | Adiantum aleuticum (Rupr.) Paris | ADAL | Pteridaceae | |
| Aleutian wormwood | Artemisia aleutica Hultén | ARAL6 | Asteraceae | |
| Alexandra palm | Archontophoenix alexandrae (F. Muell.) H. Wendl. & Drude | ARAL | Arecaceae | |
| Alexandrian laurel | Calophyllum inophyllum L. | CAIN4 | Clusiaceae | |
| alfalfa dodder | Cuscuta approximata Bab. | CUAP2 | Cuscutaceae | |
| alhagi | Alhagi Gagnebin | ALHAG | Fabaceae | |
| alien rimmed lichen | Aspicilia aliena (Zahlbr.) Oksner | ASAL16 | Hymeneliaceae | |
| alkali centaury | Centaurium trichanthum (Griseb.) B.L. Robins. | CETR2 | Gentianaceae | |
| alkali cusickiella | Cusickiella douglasii (Gray) Rollins | CUDO3 | Brassicaceae | |
| alkali mariposa lily | Calochortus striatus Parish | CAST2 | Liliaceae | |
| alkali marsh aster | Almutaster A.& D. Löve | ALMUT2 | Asteraceae | |
| alkali marsh aster | Almutaster pauciflorus (Nutt.) A.& D. Löve | ALPA14 | Asteraceae | |
| alkali milkvetch | Astragalus tener Gray | ASTE6 | Fabaceae | |
| alkali milkvetch | Astragalus tener Gray var. tener | ASTET2 | Fabaceae | |
| alkali sandmat | Chamaesyce astyla (Engelm. ex Boiss.) Millsp. | CHAS2 | Euphorbiaceae | |
| alkaliweed | Cressa L. | CRESS | Convolvulaceae | |
| alkanna | Alkanna Tausch | ALKAN | Boraginaceae | |
| alkanna | Alkanna tinctoria (L.) Tausch | ALTI | Boraginaceae | |
| allamanda | Allamanda L. | ALLAM | Apocynaceae | |
| allantoparmelia lichen | Allantoparmelia (Vainio) Essl. | ALLAN2 | Parmeliaceae | |
| allantoparmelia lichen | Allantoparmelia alpicola (Th. Fr.) Essl. | ALAL61 | Parmeliaceae | |
| Allegheny brookfoam | Boykinia aconitifolia Nutt. | BOAC | Saxifragaceae | |
| Allegheny onion | Allium allegheniense Small | ALAL4 | Liliaceae | |
| Allegheny serviceberry | Amelanchier laevis Wieg. | AMLA | Rosaceae | |
| allegheny vine | Adlumia fungosa (Ait.) Greene ex B.S.P. | ADFU | Fumariaceae | |
| allenrolfea | Allenrolfea Kuntze | ALLEN | Chenopodiaceae | |
| alliaria | Alliaria Heister ex Fabr. | ALLIA | Brassicaceae | |
| alligatorweed | Alternanthera philoxeroides (Mart.) Griseb. | ALPH | Amaranthaceae | |
| allophylus | Allophylus L. | ALLOP | Sapindaceae | |
| almendrillo | Byrsonima wadsworthii Little | BYWA | Malpighiaceae | |
| almex | Celtis trinervia Lam. | CETR3 | Ulmaceae | |
| Almquist's allantoparmelia lichen | Allantoparmelia almquistii (Vainio) Essl. | ALAL60 | Parmeliaceae | |
| aloe | Aloe L. | ALOE | Aloaceae | |
| aloina moss | Aloina aloides (J. Koch ex Schulz) Kindb. | ALAL12 | Pottiaceae | |
| aloina moss | Aloina bifrons (De Not.) Delg. | ALBI7 | Pottiaceae | |
| aloina moss | Aloina brevirostris (Hook. & Grev.) Kindb. | ALBR70 | Pottiaceae | |
| aloina moss | Aloina hamulus (C. Müll.) Broth. | ALHA5 | Pottiaceae | |
| aloina moss | Aloina Kindb. | ALOIN2 | Pottiaceae | |
| alophia | Alophia Herbert | ALOPH | Iridaceae | |
| alphitonia | Alphitonia Reissek ex Endl. | ALPHI | Rhamnaceae | |
| alpine arthrorhaphis lichen | Arthrorhaphis alpina (Schaerer) R. Sant. | ARAL60 | Arthrorhaphidaceae | |
| alpine aster | Aster alpinus L. | ASAL3 | Asteraceae | |
| alpine aster | Aster alpinus L. var. alpinus | ASALA12 | Asteraceae | |
| alpine bearberry | Arctostaphylos alpina (L.) Spreng. | ARAL2 | Ericaceae | |
| alpine bearberry | Arctostaphylos alpina (L.) Spreng. var. alpina | ARALA7 | Ericaceae | |
| alpine bellemerea lichen | Bellemerea alpina (Sommerf.) Clauzade & Roux | BEAL6 | Porpidiaceae | |
| alpine bentgrass | Agrostis humilis Vasey | AGHU | Poaceae | |
| alpine besseya | Besseya alpina (Gray) Rydb. | BEAL | Scrophulariaceae | |
| alpine bittercress | Cardamine bellidifolia L. | CABE | Brassicaceae | |
| alpine bittercress | Cardamine bellidifolia L. var. bellidifolia | CABEB | Brassicaceae | |
| alpine bittercress | Cardamine bellidifolia L. var. pachyphylla Coville & Leib. | CABEP | Brassicaceae | |
| alpine bryum moss | Bryum alpinum Huds. ex With. | BRAL9 | Bryaceae | |
| alpine cancer-root | Conopholis alpina Liebm. | COAL6 | Orobanchaceae | |
| alpine collomia | Collomia debilis (S. Wats.) Greene | CODE | Polemoniaceae | |
| alpine collomia | Collomia debilis (S. Wats.) Greene var. camporum Payson | CODEC | Polemoniaceae | |
| alpine collomia | Collomia debilis (S. Wats.) Greene var. debilis | CODED | Polemoniaceae | |
| alpine collomia | Collomia debilis (S. Wats.) Greene var. trifida Payson | CODET | Polemoniaceae | |
| alpine dustymaiden | Chaenactis douglasii (Hook.) Hook. & Arn. var. alpina Gray | CHDOA2 | Asteraceae | |
| alpine flatsedge | Cyperus fauriei Kükenth. | CYFA3 | Cyperaceae | |
| alpine knapweed | Centaurea transalpina Schleich. ex DC. | CETR6 | Asteraceae | |
| alpine ladyfern | Athyrium americanum (Butters) Maxon | ATAM | Dryopteridaceae | |
| alpine milkvetch | Astragalus alpinus L. | ASAL7 | Fabaceae | |
| alpine milkvetch | Astragalus alpinus L. var. alpinus | ASALA4 | Fabaceae | |
| alpine milkvetch | Astragalus alpinus L. var. brunetianus Fern. | ASALB | Fabaceae | |
| alpine mirrorplant | Coprosma montana Hbd. | COMO3 | Rubiaceae | |
| alpine nerve sedge | Carex neurophora Mackenzie | CANE6 | Cyperaceae | |
| alpine pussytoes | Antennaria alpina (L.) Gaertn. | ANAL4 | Asteraceae | |
| alpine rockcress | Arabis alpina L. | ARAL8 | Brassicaceae | |
| alpine sagebrush | Artemisia scopulorum Gray | ARSC | Asteraceae | |
| alpine sandmat | Chamaesyce olowaluana (Sherff) Croizat & Deg. | CHOL3 | Euphorbiaceae | |
| alpine springbeauty | Claytonia megarhiza (Gray) Parry ex S. Wats. | CLME | Portulacaceae | |
| alpine springbeauty | Claytonia megarhiza (Gray) Parry ex S. Wats. var. bellidifolia (Rydb.) C.L. Hitchc. | CLMEB | Portulacaceae | |
| alpine springbeauty | Claytonia megarhiza (Gray) Parry ex S. Wats. var. megarhiza | CLMEM | Portulacaceae | |
| alpine springbeauty | Claytonia megarhiza (Gray) Parry ex S. Wats. var. nivalis (English) C.L. Hitchc. | CLMEN | Portulacaceae | |
| alpinia | Alpinia Roxb. | ALPIN | Zingiberaceae | |
| Alps wormwood | Artemisia umbelliformis Lam. | ARUM | Asteraceae | |
| Alps yarrow | Achillea distans Waldst. & Kit. ex Willd. | ACDI6 | Asteraceae | |
| alsia moss | Alsia Sull. | ALSIA | Leucodontaceae | |
| alsinidendron | Alsinidendron Mann | ALSIN | Caryophyllaceae | |
| alsophila | Alsophila R. Br. | ALSOP | Cyatheaceae | |
| alstonia | Alstonia R. Br. | ALSTO | Apocynaceae | |
| alternateleaf archidium moss | Archidium alternifolium (Hedw.) Schimp. | ARAL22 | Archidiaceae | |
| alternateleaf dogwood | Cornus alternifolia L. f. | COAL2 | Cornaceae | |
| alternate-leaf golden saxifrage | Chrysosplenium alternifolium L. | CHAL24 | Saxifragaceae | |
| alternateleaf jessamine | Cestrum alternifolium (Jacq.) O.E. Schulz | CEAL3 | Solanaceae | |
| alvaradoa | Alvaradoa Liebm. | ALVAR | Simaroubaceae | |
| alverjilla | Adesmia bicolor (Poir.) DC. | ADBI3 | Fabaceae | |
| Alvord milkvetch | Astragalus alvordensis M.E. Jones | ASAL9 | Fabaceae | |
| alyce clover | Alysicarpus ovalifolius (Schumacher) J. Léonard | ALOV | Fabaceae | |
| alyssum | Alyssum simplex Rudolphi | ALSI8 | Brassicaceae | |
| alyssum | Alyssum strigosum Banks & Soland. | ALST2 | Brassicaceae | |
| alyssum evening-primrose | Camissonia boothii (Dougl. ex Lehm.) Raven ssp. alyssoides (Hook. & Arn.) Raven | CABOA | Onagraceae | |
| alyxia | Alyxia Banks ex R. Br. | ALYXI | Apocynaceae | |
| amaryllis | Amaryllis L. | AMARY | Liliaceae | |
| amatungulu | Carissa macrocarpa (Ecklon) A. DC. | CAMA37 | Apocynaceae | |
| Amazon canoparmelia lichen | Canoparmelia amazonica (Nyl.) Elix & Hale | CAAM26 | Parmeliaceae | |
| ambatch | Aeschynomene elaphroxylon (Guillemin & Perrottet) Taubert | AEEL2 | Fabaceae | |
| Ambay pumpwood | Cecropia adenopus Mart. ex Miq. | CEAD2 | Cecropiaceae | |
| amberboa | Amberboa (Pers.) Less. | AMBER | Asteraceae | |
| ambiguous aloina moss | Aloina aloides (J. Koch ex Schulz) Kindb. var. ambigua (Bruch & Schimp. in B.S.G.) Craig in Grout | ALALA | Pottiaceae | |
| amblyodon moss | Amblyodon Bruch & Schimp. in B.S.G. | AMBLY3 | Meesiaceae | |
| amblyodon moss | Amblyodon dealbatus (Hedw.) Bruch & Schimp. in B.S.G. | AMDE70 | Meesiaceae | |
| amblyolepis | Amblyolepis DC. | AMBLY | Asteraceae | |
| amblyopappus | Amblyopappus Hook. & Arn. | AMBLY2 | Asteraceae | |
| amblyopyrum | Amblyopyrum Eig | AMBLY5 | Poaceae | |
| amblyopyrum | Amblyopyrum muticum (Boiss.) Eig | AMMU5 | Poaceae | |
| amblystegium moss | Amblystegium Schimp. in B.S.G. | AMBLY4 | Amblystegiaceae | |
| amblystegium moss | Amblystegium serpens (Hedw.) Schimp. in B.S.G. | AMSE3 | Amblystegiaceae | |
| amblystegium moss | Amblystegium serpens (Hedw.) Schimp. in B.S.G. var. serpens | AMSES | Amblystegiaceae | |
| amblystegium moss | Amblystegium varium (Hedw.) Lindb. | AMVA | Amblystegiaceae | |
| ambrosia leaf burr ragweed | Ambrosia ambrosioides (Cav.) Payne | AMAM2 | Asteraceae | |
| amelasorbus | ×Amelasorbus Rehd. | AMELA2 | Rosaceae | |
| Amelia's sand verbena | Abronia ameliae Lundell | ABAM2 | Nyctaginaceae | |
| American anzia lichen | Anzia americana Yoshim. & Sharp | ANAM6 | Parmeliaceae | |
| American aspicilia | Aspicilia americana de Lesd. | ASAM10 | Hymeneliaceae | |
| American barberry | Berberis canadensis P. Mill. | BECA2 | Berberidaceae | |
| American beachgrass | Ammophila breviligulata Fern. | AMBR | Poaceae | |
| American beautyberry | Callicarpa americana L. | CAAM2 | Verbenaceae | |
| American bellflower | Campanulastrum americanum (L.) Small | CAAM18 | Campanulaceae | |
| American bittercress | Cardamine rotundifolia Michx. | CARO3 | Brassicaceae | |
| American bittersweet | Celastrus scandens L. | CESC | Celastraceae | |
| American bluehearts | Buchnera americana L. | BUAM | Scrophulariaceae | |
| American brunfelsia | Brunfelsia americana L. | BRAM4 | Solanaceae | |
| American buckwheat vine | Brunnichia ovata (Walt.) Shinners | BROV4 | Polygonaceae | |
| American bugseed | Corispermum americanum (Nutt.) Nutt. | COAM8 | Chenopodiaceae | |
| American bugseed | Corispermum americanum (Nutt.) Nutt. var. americanum | COAMA2 | Chenopodiaceae | |
| American bugseed | Corispermum americanum (Nutt.) Nutt. var. rydbergii Mosyakin | COAMR | Chenopodiaceae | |
| American cancer-root | Conopholis americana (L.) Wallr. | COAM | Orobanchaceae | |
| American century plant | Agave americana L. | AGAM | Agavaceae | |
| American century plant | Agave americana L. ssp. americana | AGAMA | Agavaceae | |
| American century plant | Agave americana L. ssp. americana var. americana | AGAMA2 | Agavaceae | |
| American century plant | Agave americana L. ssp. americana var. expansa (Jacobi) Gentry | AGAME | Agavaceae | |
| American century plant | Agave americana L. ssp. protamericana Gentry | AGAMP | Agavaceae | |
| American chestnut | Castanea dentata (Marsh.) Borkh. | CADE12 | Fagaceae | |
| American climacium moss | Climacium americanum Brid. | CLAM3 | Climaciaceae | |
| American cracked lichen | Acarospora americana H. Magn. | ACAM5 | Acarosporaceae | |
| American dodder | Cuscuta americana L. | CUAM3 | Cuscutaceae | |
| American dwarf mistletoe | Arceuthobium americanum Nutt. ex Engelm. | ARAM | Viscaceae | |
| American golden saxifrage | Chrysosplenium americanum Schwein. ex Hook. | CHAM2 | Saxifragaceae | |
| American grama | Bouteloua americana (L.) Scribn. | BOAM2 | Poaceae | |
| American hazelnut | Corylus americana Walt. | COAM3 | Betulaceae | |
| American hogpeanut | Amphicarpaea bracteata (L.) Fern. | AMBR2 | Fabaceae | |
| American hogpeanut | Amphicarpaea bracteata (L.) Fern. var. bracteata | AMBRB | Fabaceae | |
| American hogpeanut | Amphicarpaea bracteata (L.) Fern. var. comosa (L.) Fern. | AMBRC | Fabaceae | |
| American hornbeam | Carpinus caroliniana Walt. | CACA18 | Betulaceae | |
| American hornbeam | Carpinus caroliniana Walt. ssp. caroliniana | CACAC2 | Betulaceae | |
| American hornbeam | Carpinus caroliniana Walt. ssp. virginiana (Marsh.) Furlow | CACAV | Betulaceae | |
| American horsehair lichen | Bryoria trichodes (Michaux) Brodo & D. Hawksw. ssp. americana (Mot.) Brodo & D. Hawksw. | BRTRA | Parmeliaceae | |
| American lily-of-the-valley | Convallaria majuscula Greene | COMA19 | Liliaceae | |
| American madwort | Alyssum obovatum (C.A. Mey.) Turcz. | ALOB5 | Brassicaceae | |
| American melonleaf | Cayaponia americana (Lam.) Cogn. | CAAM15 | Cucurbitaceae | |
| American milkvetch | Astragalus americanus (Hook.) M.E. Jones | ASAM3 | Fabaceae | |
| American rockbrake | Cryptogramma acrostichoides R. Br. | CRAC3 | Pteridaceae | |
| American scurfpea | Cullen americanum (L.) Rydb. | CUAM5 | Fabaceae | |
| American searocket | Cakile edentula (Bigelow) Hook. | CAED | Brassicaceae | |
| American searocket | Cakile edentula (Bigelow) Hook. ssp. edentula | CAEDE | Brassicaceae | |
| American searocket | Cakile edentula (Bigelow) Hook. ssp. edentula var. edentula | CAEDE2 | Brassicaceae | |
| American searocket | Cakile edentula (Bigelow) Hook. ssp. edentula var. lacustris Fern. | CAEDL2 | Brassicaceae | |
| American sloughgrass | Beckmannia syzigachne (Steud.) Fern. | BESY | Poaceae | |
| American smoketree | Cotinus obovatus Raf. | COOB2 | Anacardiaceae | |
| American spikenard | Aralia racemosa L. | ARRA | Araliaceae | |
| American spikenard | Aralia racemosa L. ssp. bicrenata (Woot. & Standl.) Welsh & Atwood | ARRAB2 | Araliaceae | |
| American spikenard | Aralia racemosa L. ssp. racemosa | ARRAR | Araliaceae | |
| American star-thistle | Centaurea americana Nutt. | CEAM2 | Asteraceae | |
| American thorow wax | Bupleurum americanum Coult. & Rose | BUAM2 | Apiaceae | |
| American trailplant | Adenocaulon bicolor Hook. | ADBI | Asteraceae | |
| American water plantain | Alisma subcordatum Raf. | ALSU | Alismataceae | |
| American woollyfruit sedge | Carex lasiocarpa Ehrh. var. americana Fern. | CALAA | Cyperaceae | |
| American yellowrocket | Barbarea orthoceras Ledeb. | BAOR | Brassicaceae | |
| amerorchis | Amerorchis Hultén | AMERO | Orchidaceae | |
| Ames' milkvetch | Astragalus pulsiferae Gray | ASPU7 | Fabaceae | |
| Ames' milkvetch | Astragalus pulsiferae Gray var. pulsiferae | ASPUP5 | Fabaceae | |
| amianthium | Amianthium Gray | AMIAN | Liliaceae | |
| ammi | Ammi L. | AMMI4 | Apiaceae | |
| ammocharis | Ammocharis Herb. | AMMOC2 | Liliaceae | |
| ammocodon | Ammocodon Standl. | AMMOC | Nyctaginaceae | |
| amorphophallus | Amorphophallus Blume ex Decne. | AMORP2 | Araceae | |
| amphianthus | Amphianthus Torr. | AMPHI5 | Scrophulariaceae | |
| amphidium moss | Amphidium Schimp. | AMPHI10 | Orthotrichaceae | |
| amphilophium | Amphilophium Kunth | AMPHI6 | Bignoniaceae | |
| amphitecna | Amphitecna Miers | AMPHI7 | Bignoniaceae | |
| Amur maple | Acer ginnala Maxim. | ACGI | Aceraceae | |
| Amur peppervine | Ampelopsis brevipedunculata (Maxim.) Trautv. | AMBR7 | Vitaceae | |
| amygdalaria lichen | Amygdalaria consentiens (Nyl.) Hertel, Brodo & Mas. Inoue | AMCO10 | Porpidiaceae | |
| amygdalaria lichen | Amygdalaria continua Brodo & Hertel | AMCO11 | Porpidiaceae | |
| amygdalaria lichen | Amygdalaria Norman | AMYGD2 | Porpidiaceae | |
| amygdalaria lichen | Amygdalaria panaeola (Ach.) Hertel & Brodo | AMPA12 | Porpidiaceae | |
| amygdalaria lichen | Amygdalaria pelobotryon (Wahlenb.) Norman | AMPE5 | Porpidiaceae | |
| amygdalaria lichen | Amygdalaria subdissentiens (Nyl.) Mas. Inoue & Brodo | AMSU2 | Porpidiaceae | |
| anacahuita | Cordia boissieri A. DC. | COBO2 | Boraginaceae | |
| anacamptodon moss | Anacamptodon Brid. | ANACA2 | Fabroniaceae | |
| anacamptodon moss | Anacamptodon splachnoides (Froel. ex Brid.) Brid. | ANSP11 | Fabroniaceae | |
| anacardium | Anacardium L. | ANACA | Anacardiaceae | |
| anacolia moss | Anacolia laevisphaera (Tayl.) Flow. | ANLA14 | Bartramiaceae | |
| anacolia moss | Anacolia Schimp. | ANACO | Bartramiaceae | |
| anacyclus | Anacyclus L. | ANACY2 | Asteraceae | |
| anadenanthera | Anadenanthera Speg. | ANADE | Fabaceae | |
| analogue sedge | Carex simulata Mackenzie | CASI2 | Cyperaceae | |
| Anderson's brachymenium moss | Brachymenium andersonii Crum | BRAN6 | Bryaceae | |
| Anderson's hawksbeard | Crepis runcinata (James) Torr. & Gray ssp. andersonii (Gray) Babcock & Stebbins | CRRUA | Asteraceae | |
| Anderson's milkvetch | Astragalus andersonii Gray | ASAN2 | Fabaceae | |
| Anderson's rockjasmine | Androsace chamaejasme Wulfen ssp. andersonii Hultén | ANCHA | Primulaceae | |
| Andersson's arctoa moss | Arctoa anderssonii Wich. | ARAN16 | Dicranaceae | |
| andira | Andira Juss. | ANDIR | Fabaceae | |
| andreaea moss | Andreaea alpestris (Thed.) Schimp. | ANAL13 | Andreaeaceae | |
| andreaea moss | Andreaea crassinervia Bruch | ANCR8 | Andreaeaceae | |
| andreaea moss | Andreaea Hedw. | ANDRE2 | Andreaeaceae | |
| andreaea moss | Andreaea megistospora B. Murr. | ANME8 | Andreaeaceae | |
| andreaea moss | Andreaea megistospora B. Murr. var. epapillosa (B. Murr.) Crum & Anderson | ANMEE | Andreaeaceae | |
| andreaea moss | Andreaea megistospora B. Murr. var. megistospora | ANMEM2 | Andreaeaceae | |
| andreaea moss | Andreaea mutabilis Hook. f. & Wils. | ANMU9 | Andreaeaceae | |
| andreaea moss | Andreaea nivalis Hook. | ANNI6 | Andreaeaceae | |
| andreaea moss | Andreaea rupestris Hedw. | ANRU7 | Andreaeaceae | |
| andreaea moss | Andreaea rupestris Hedw. var. papillosa (Lindb.) Podp. | ANRUP | Andreaeaceae | |
| andreaea moss | Andreaea rupestris Hedw. var. rupestris | ANRUR | Andreaeaceae | |
| andreaea moss | Andreaea sinuosa B. Murr. | ANSI4 | Andreaeaceae | |
| andreaeobryum moss | Andreaeobryum Steere & B. Murray | ANDRE3 | Andreaeobryaceae | |
| Andrew's clintonia | Clintonia andrewsiana Torr. | CLAN2 | Liliaceae | |
| anechites | Anechites Griseb. | ANECH | Apocynaceae | |
| aneilema | Aneilema R. Br. | ANEIL2 | Commelinaceae | |
| anelsonia | Anelsonia J.F. Macbr. & Payson | ANELS | Brassicaceae | |
| anema lichen | Anema Nyl. ex Forss. | ANEMA | Lichinaceae | |
| anemia fern | Anemia Sw. | ANEMI | Anemiaceae | |
| anemone | Anemone L. | ANEMO | Ranunculaceae | |
| anena | Boerhavia repens L. | BORE4 | Nyctaginaceae | |
| angelica | Angelica L. | ANGEL | Apiaceae | |
| angelon | Angelonia Humb. & Bonpl. | ANGEL2 | Scrophulariaceae | |
| angel's trumpets | Acleisanthes longiflora Gray | ACLO2 | Nyctaginaceae | |
| angel's-tears | Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Bercht. & K. Presl | BRSU3 | Solanaceae | |
| angel's-trumpet | Brugmansia ×candida Pers. (pro sp.) [aurea × versicolor] | BRCA31 | Solanaceae | |
| angiopteris fern | Angiopteris Hoffmann | ANGIO | Marattiaceae | |
| anglestem Indian mallow | Abutilon trisulcatum (Jacq.) Urban | ABTR | Malvaceae | |
| angostura | Angostura Roemer and Schultes | ANGOS | Rutaceae | |
| angostura | Angostura trifoliata (Willd.) T. S. Elias | ANTR8 | Rutaceae | |
| aniba | Aniba Aubl. | ANIBA | Lauraceae | |
| anil falso | Coursetia caribaea (Jacq.) Lavin | COCA31 | Fabaceae | |
| anil falso | Coursetia caribaea (Jacq.) Lavin var. caribaea | COCAC6 | Fabaceae | |
| anil falso | Coursetia caribaea (Jacq.) Lavin var. sericea (Gray) Lavin | COCAS2 | Fabaceae | |
| animated oat | Avena sterilis L. | AVST | Poaceae | |
| aniseia | Aniseia Choisy | ANISE | Convolvulaceae | |
| anisocoma | Anisocoma Torr. & Gray | ANISO3 | Asteraceae | |
| anisomeridium lichen | Anisomeridium (Mull. Arg.) Choisy | ANISO4 | Monoblastiaceae | |
| anisomeridium lichen | Anisomeridium albisedum (Nyl.) R. C. Harris | ANAL12 | Monoblastiaceae | |
| anisomeridium lichen | Anisomeridium ambiguum (Zahlbr.) R. C. Harris | ANAM5 | Monoblastiaceae | |
| anisomeridium lichen | Anisomeridium biforme (Borrer) R. C. Harris | ANBI3 | Monoblastiaceae | |
| anisomeridium lichen | Anisomeridium carthiniacum (Steiner) R. C. Harris | ANCA34 | Monoblastiaceae | |
| anisomeridium lichen | Anisomeridium distans (Willey) R. C. Harris | ANDI9 | Monoblastiaceae | |
| anisomeridium lichen | Anisomeridium leucochlorum (Mull. Arg.) R. C. Harris | ANLE10 | Monoblastiaceae | |
| anisomeridium lichen | Anisomeridium nyssigenum (Ellis & Everh.) R. C. Harris | ANNY | Monoblastiaceae | |
| anisomeridium lichen | Anisomeridium subprostans (Nyl.) R. C. Harris | ANSU8 | Monoblastiaceae | |
| annona | Annona L. | ANNON | Annonaceae | |
| annona | Annona purpurea Mocino & Sesse ex Dunal | ANPU13 | Annonaceae | |
| annual agoseris | Agoseris heterophylla (Nutt.) Greene | AGHE2 | Asteraceae | |
| annual agoseris | Agoseris heterophylla (Nutt.) Greene var. crenulata Jepson | AGHEC | Asteraceae | |
| annual agoseris | Agoseris heterophylla (Nutt.) Greene var. heterophylla | AGHEH | Asteraceae | |
| annual agoseris | Agoseris heterophylla (Nutt.) Greene var. turgida (Hall) Jepson | AGHET | Asteraceae | |
| annual desert milkvetch | Astragalus aridus Gray | ASAR5 | Fabaceae | |
| annual ragweed | Ambrosia artemisiifolia L. | AMAR2 | Asteraceae | |
| annual ragweed | Ambrosia artemisiifolia L. var. artemisiifolia | AMARA2 | Asteraceae | |
| annual ragweed | Ambrosia artemisiifolia L. var. elatior (L.) Descourtils | AMARE | Asteraceae | |
| annual ragweed | Ambrosia artemisiifolia L. var. paniculata (Michx.) Blank. | AMARP | Asteraceae | |
| annual silver hairgrass | Aira elegans Willd. ex Kunth | AIEL4 | Poaceae | |
| annual vernalgrass | Anthoxanthum aristatum Boiss. | ANAR7 | Poaceae | |
| annual windmills | Allionia choisyi Standl. | ALCH | Nyctaginaceae | |
| anoda | Anoda Cav. | ANODA | Malvaceae | |
| anoectangium moss | Anoectangium aestivum (Hedw.) Mitt. | ANAE | Pottiaceae | |
| anoectangium moss | Anoectangium incurvans (Schimp. ex Besch.) Bartr. | ANIN10 | Pottiaceae | |
| anoectangium moss | Anoectangium Schwaegr. | ANOEC2 | Pottiaceae | |
| anoectangium moss | Anoectangium tenuinerve (Limpr.) Par. | ANTE10 | Pottiaceae | |
| anoectochilus | Anoectochilus Blume | ANOEC | Orchidaceae | |
| anogeissus | Anogeissus (DC.) Guillemin, Perrottet, & A. Rich. | ANOGE | Combretaceae | |
| anomalous cola | Cola anomala Schumann | COAN14 | Sterculiaceae | |
| anomobryum moss | Anomobryum leptostomoides Schimp. in Rabenh. | ANLE13 | Bryaceae | |
| anomobryum moss | Anomobryum Schimp. | ANOMO3 | Bryaceae | |
| anomodon moss | Anomodon attenuatus (Hedw.) Hüb. | ANAT4 | Anomodontaceae | |
| anomodon moss | Anomodon Hook. & Tayl. | ANOMO | Anomodontaceae | |
| anomodon moss | Anomodon minor (Hedw.) Fürnr. | ANMI9 | Anomodontaceae | |
| anomodon moss | Anomodon rostratus (Hedw.) Schimp. | ANRO6 | Anomodontaceae | |
| anomodon moss | Anomodon viticulosus (Hedw.) Hook. & Tayl. | ANVI14 | Anomodontaceae | |
| anopteris | Anopteris Prantl ex Diels | ANOPT | Pteridaceae | |
| antelopehorns | Asclepias asperula (Dcne.) Woods. ssp. capricornu (Woods.) Woods. | ASASC | Asclepiadaceae | |
| antenoron | Antenoron Rafin. | ANTEN2 | Polygonaceae | |
| anthoceros | Anthoceros adscendens Lehm. & Lindenb. | ANAD3 | Anthocerotaceae | |
| anthoceros | Anthoceros fusiformis Austin | ANFU6 | Anthocerotaceae | |
| anthoceros | Anthoceros punctatus L. | ANPU12 | Anthocerotaceae | |
| anthoceros | Anthoceros scarious Austin | ANSC13 | Anthocerotaceae | |
| anthracothecium lichen | Anthracothecium canellae-albae (Fee) Mull. Arg. | ANCA35 | Pyrenulaceae | |
| anthracothecium lichen | Anthracothecium Hampe ex A. Massal. | ANTHR2 | Pyrenulaceae | |
| anthracothecium lichen | Anthracothecium nanum (Zahlbr.) R. C. Harris | ANNA3 | Pyrenulaceae | |
| anthracothecium lichen | Anthracothecium prasinum (Eschw.) R. C. Harris | ANPR4 | Pyrenulaceae | |
| anthracothecium lichen | Anthracothecium staurosporum (Tuck. ex Willey) Zahlbr. | ANST9 | Pyrenulaceae | |
| anthracothecium lichen | Anthracothecium subglobosum Riddle | ANSU9 | Pyrenulaceae | |
| anthracothecium lichen | Anthracothecium varians R. C. Harris | ANVA | Pyrenulaceae | |
| anthurium | Anthurium palmatum (L.) G. Don | ANPA12 | Araceae | |
| antidaphne | Antidaphne Poepp. & Endl. | ANTID2 | Eremolepidaceae | |
| antigonon | Antigonon Endl. | ANTIG | Polygonaceae | |
| Antilles calophyllum | Calophyllum antillanum Britt. | CAAN22 | Clusiaceae | |
| Antilles spleenwort | Asplenium pseudoerectum Hieron. | ASPS2 | Aspleniaceae | |
| antitrichia moss | Antitrichia Brid. | ANTIT2 | Leucodontaceae | |
| antitrichia moss | Antitrichia curtipendula (Hedw.) Brid. | ANCU3 | Leucodontaceae | |
| antitrichia moss | Antitrichia curtipendula (Hedw.) Brid. var. curtipendula | ANCUC | Leucodontaceae | |
| antlerfern | Ceratopteris Brongn. | CERAT2 | Parkeriaceae | |
| anzia lichen | Anzia colpodes (Ach.) Stizenb. | ANCO25 | Parmeliaceae | |
| anzia lichen | Anzia Stizenb. | ANZIA | Parmeliaceae | |
| aongstroemia moss | Aongstroemia Bruch & Schimp. in B.S.G. | AONGS | Dicranaceae | |
| aongstroemia moss | Aongstroemia longipes (Somm.) Bruch & Schimp. in B.S.G. | AOLO | Dicranaceae | |
| Apache beggarticks | Bidens ferulifolia (Jacq.) DC. | BIFE2 | Asteraceae | |
| Apache dwarf mistletoe | Arceuthobium apachecum Hawksworth & Wiens | ARAP2 | Viscaceae | |
| Apache milkvetch | Astragalus nutriosensis Sanderson | ASNU7 | Fabaceae | |
| Apache Pass spiderling | Boerhavia pterocarpa S. Wats. | BOPT | Nyctaginaceae | |
| apachebush | Apacheria chiricahuensis C.T. Mason | APCH | Crossosomataceae | |
| apacheria | Apacheria C.T. Mason | APACH | Crossosomataceae | |
| Apalachicola doll's daisy | Boltonia apalachicolensis L.C. Anders. | BOAP | Asteraceae | |
| Apalachicola false rosemary | Conradina glabra Shinners | COGL9 | Lamiaceae | |
| Apalachicola wild indigo | Baptisia megacarpa Chapman ex Torr. & Gray | BAME | Fabaceae | |
| aphanorrhegma moss | Aphanorrhegma Sull. in Gray | APHAN5 | Funariaceae | |
| aphragmus | Aphragmus Andrz. ex DC. | APHRA | Brassicaceae | |
| apiastrum | Apiastrum Nutt. ex Torr. & Gray | APIAS | Apiaceae | |
| apiculate bryum moss | Bryum apiculatum Schwaegr. | BRAP2 | Bryaceae | |
| aplodon moss | Aplodon R. Br. | APLOD2 | Splachnaceae | |
| apodanthera | Apodanthera Arn. | APODA | Cucurbitaceae | |
| aponogeton | Aponogeton L. f. | APONO | Aponogetonaceae | |
| Appalachia false bindweed | Calystegia sepium (L.) R. Br. ssp. appalachiana Brummitt | CASEA4 | Convolvulaceae | |
| Appalachian bugbane | Actaea rubifolia (Kearney) Kartesz | ACRU14 | Ranunculaceae | |
| Appalachian false goat's beard | Astilbe biternata (Vent.) Britt. | ASBI4 | Saxifragaceae | |
| Appalachian sedge | Carex appalachica J. Webber & P.W. Ball | CAAP5 | Cyperaceae | |
| appendage brodiaea | Brodiaea appendiculata Hoover | BRAP | Liliaceae | |
| apple blossom | Cassia javanica L. | CAJA3 | Fabaceae | |
| apple blossom | Cassia javanica L. var. indochinensis Gagnepain | CAJAI | Fabaceae | |
| Applegate's milkvetch | Astragalus applegatei M.E. Peck | ASAP | Fabaceae | |
| approximate orange lichen | Caloplaca approximata (Lynge) H. Magn. | CAAP7 | Teloschistaceae | |
| aptenia | Aptenia N.E. Br. | APTEN | Aizoaceae | |
| apteria | Apteria Nutt. | APTER | Burmanniaceae | |
| Aquarius Plateau Indian paintbrush | Castilleja aquariensis N. Holmgren | CAAQ4 | Scrophulariaceae | |
| aquatic aspicilia | Aspicilia aquatica Korber | ASAQ60 | Hymeneliaceae | |
| aquatic milkweed | Asclepias perennis Walt. | ASPE | Asclepiadaceae | |
| Arabian coffee | Coffea arabica L. | COAR2 | Rubiaceae | |
| Arabian pea | Bituminaria bituminosa (L.) Stirton | BIBI4 | Fabaceae | |
| Arapaho sedge | Carex arapahoensis Clokey | CAAR13 | Cyperaceae | |
| araucaria | Araucaria Juss. | ARAUC2 | Araucariaceae | |
| araujia | Araujia Brot. | ARAUJ | Asclepiadaceae | |
| Arboles milkvetch | Astragalus oocalycis M.E. Jones | ASOO | Fabaceae | |
| arboreal bentspur orchid | Campylocentrum fasciolum (Lindl.) Cogn. | CAFA2 | Orchidaceae | |
| arborescent angel's-tears | Brugmansia versicolor Lagerh. | BRVE9 | Solanaceae | |
| arcane milkvetch | Astragalus obscurus S. Wats. | ASOB4 | Fabaceae | |
| archangel bryum moss | Bryum archangelicum Bruch & Schimp. in B.S.G. | BRAR15 | Bryaceae | |
| archidium moss | Archidium Brid. | ARCHI6 | Archidiaceae | |
| archidium moss | Archidium tenerrimum Mitt. | ARTE14 | Archidiaceae | |
| archontophoenix | Archontophoenix H. Wendl. & Drude | ARCHO2 | Arecaceae | |
| arctic aspicilia | Aspicilia arctica (Lynge) Oksner | ASAR14 | Hymeneliaceae | |
| arctic bellflower | Campanula uniflora L. | CAUN2 | Campanulaceae | |
| arctic bentgrass | Agrostis aequivalvis (Trin.) Trin. | AGAE | Poaceae | |
| arctic brodoa lichen | Brodoa oroarctica (Krog) Goward | BROR60 | Parmeliaceae | |
| arctic brome | Bromus kalmii Gray | BRKA2 | Poaceae | |
| arctic bryum moss | Bryum arcticum (R. Br.) Bruch & Schimp. in B.S.G. | BRAR70 | Bryaceae | |
| arctic cinclidium moss | Cinclidium arcticum Bruch & Schimp. in B.S.G. | CIAR70 | Mniaceae | |
| arctic cratoneuron moss | Cratoneuron arcticum Steere | CRAR13 | Amblystegiaceae | |
| Arctic daisy | Chrysanthemum arcticum L. | CHAR13 | Asteraceae | |
| Arctic daisy | Chrysanthemum arcticum L. ssp. arcticum | CHARA | Asteraceae | |
| arctic daisy | Chrysanthemum arcticum L. ssp. polare Hultén | CHARP3 | Asteraceae | |
| arctic eggyolk lichen | Candelariella arctica (Korber) R. Sant. | CAAR37 | Candelariaceae | |
| arctic marsh sedge | Carex holostoma Drej. | CAHO4 | Cyperaceae | |
| arctic reedgrass | Calamagrostis coarctata (Torr.) Eat. | CACO71 | Poaceae | |
| arctic springbeauty | Claytonia arctica M.F. Adams | CLAR2 | Portulacaceae | |
| arctic star campylium moss | Campylium stellatum (Hedw.) C. Jens. var. arcticum (Williams) Sav.-Ljub. | CASTA5 | Amblystegiaceae | |
| arctic wormwood | Artemisia senjavinensis Bess. | ARSE5 | Asteraceae | |
| arctoa moss | Arctoa Bruch & Schimp. in B.S.G. | ARCTO5 | Dicranaceae | |
| arctoa moss | Arctoa fulvella (Dicks.) Bruch & Schimp. in B.S.G. | ARFU70 | Dicranaceae | |
| arctoa moss | Arctoa hyperborea (With.) Bruch & Schimp. in B.S.G. | ARHY5 | Dicranaceae | |
| arctomia lichen | Arctomia interfixa (Nyl.) Vainio | ARIN13 | Arctomiaceae | |
| arctomia lichen | Arctomia Th. Fr. | ARCTO7 | Arctomiaceae | |
| arctoparmelia lichen | Arctoparmelia centrifuga (L.) Hale | ARCE60 | Parmeliaceae | |
| arctoparmelia lichen | Arctoparmelia Hale | ARCTO8 | Parmeliaceae | |
| arctoparmelia lichen | Arctoparmelia incurva (Pers.) Hale | ARIN60 | Parmeliaceae | |
| arctoparmelia lichen | Arctoparmelia separata (Th. Fr.) Hale | ARSE60 | Parmeliaceae | |
| arctoparmelia lichen | Arctoparmelia subcentrifuga (Oksner) Hale | ARSU12 | Parmeliaceae | |
| arctopeltis lichen | Arctopeltis Poelt | ARCTO9 | Lecanoraceae | |
| arctotis | Arctotis L. | ARCTO4 | Asteraceae | |
| areca palm | Areca L. | ARECA | Arecaceae | |
| arecastrum palm | Arecastrum (Drude) Becc. | ARECA2 | Arecaceae | |
| arenga palm | Arenga Labill. | ARENG | Arecaceae | |
| Argentina mountain bamboo | Chusquea montana Phil. | CHMO12 | Poaceae | |
| Argentinian biddy-biddy | Acaena pinnatifida Ruiz & Pavón | ACPI3 | Rosaceae | |
| Argentinian quila | Chusquea quila Kunth | CHQU2 | Poaceae | |
| argyreia | Argyreia Lour. | ARGYR2 | Convolvulaceae | |
| arhyrautia | ×Argyrautia Sherff | ARGYR4 | Asteraceae | |
| aridland goosefoot | Chenopodium desiccatum A. Nels. | CHDE | Chenopodiaceae | |
| arisaema | Arisaema heterophyllum Blume | ARHE8 | Araceae | |
| arisaema | Arisaema tortuosum (Wallich) Schott | ARTO7 | Araceae | |
| aristea | Aristea Ait. | ARIST3 | Iridaceae | |
| Arizona alder | Alnus oblongifolia Torr. | ALOB2 | Betulaceae | |
| Arizona anoda | Anoda thurberi Gray | ANTH3 | Malvaceae | |
| Arizona baccharis | Baccharis thesioides Kunth | BATH | Asteraceae | |
| Arizona beggarticks | Bidens aurea (Ait.) Sherff | BIAU | Asteraceae | |
| Arizona bluehearts | Buchnera obliqua Benth. | BUOB3 | Scrophulariaceae | |
| Arizona bluestar | Amsonia grandiflora Alexander | AMGR4 | Apocynaceae | |
| Arizona boxelder | Acer negundo L. var. arizonicum Sarg. | ACNEA | Aceraceae | |
| Arizona brome | Bromus arizonicus (Shear) Stebbins | BRAR4 | Poaceae | |
| Arizona centaury | Centaurium arizonicum (Gray) Heller | CEAR12 | Gentianaceae | |
| Arizona centaury | Centaurium calycosum (Buckl.) Fern. | CECA3 | Gentianaceae | |
| Arizona century plant | Agave ×arizonica Gentry & J.Z. Weber (pro sp.) [chrysantha × toumeyana] | AGAR8 | Agavaceae | |
| Arizona clematis | Clematis hirsutissima Pursh var. arizonica (Heller) Erickson | CLHIA | Ranunculaceae | |
| Arizona coraldrops | Besseya arizonica Pennell | BEAR | Scrophulariaceae | |
| Arizona cypress | Cupressus arizonica Greene | CUAR | Cupressaceae | |
| Arizona cypress | Cupressus arizonica Greene ssp. arizonica | CUARA | Cupressaceae | |
| Arizona desert foxglove | Brachystigma wrightii (Gray) Pennell | BRWR | Scrophulariaceae | |
| Arizona lipfern | Cheilanthes arizonica (Maxon) Mickel | CHAR7 | Pteridaceae | |
| Arizona madrone | Arbutus arizonica (Gray) Sarg. | ARAR2 | Ericaceae | |
| Arizona milkvetch | Astragalus arizonicus Gray | ASAR6 | Fabaceae | |
| Arizona milkweed | Asclepias angustifolia Schweig. | ASAN5 | Asclepiadaceae | |
| Arizona monkshood | Aconitum infectum Greene | ACIN2 | Ranunculaceae | |
| Arizona needle grama | Bouteloua aristidoides (Kunth) Griseb. var. arizonica M.E. Jones | BOARA2 | Poaceae | |
| Arizona orange lichen | Caloplaca arizonica H. Magn. | CAAR36 | Teloschistaceae | |
| Arizona pencil cholla | Cylindropuntia arbuscula (Engelm.) F.M. Knuth | CYAR14 | Cactaceae | |
| Arizona pricklypoppy | Argemone arizonica G.B. Ownbey | ARAR4 | Papaveraceae | |
| Arizona pussypaws | Cistanthe parryi (Gray) Hershkovitz var. arizonica (J.T. Howell) Kartesz & Gandhi | CIPAA | Portulacaceae | |
| Arizona rabbitbrush | Chrysothamnus molestus (Blake) L.C. Anders. | CHMO2 | Asteraceae | |
| Arizona sandmat | Chamaesyce arizonica (Engelm.) Arthur | CHAR18 | Euphorbiaceae | |
| Arizona scaly cloakfern | Astrolepis cochisensis (Goodding) Benham & Windham ssp. arizonica Benham | ASCOA2 | Pteridaceae | |
| Arizona spikenard | Aralia humilis Cav. | ARHU | Araliaceae | |
| Arizona swallow-wort | Cynanchum arizonicum (Gray) Shinners | CYAR12 | Asclepiadaceae | |
| Arizona thistle | Cirsium arizonicum (Gray) Petrak | CIAR3 | Asteraceae | |
| Arizona threeawn | Aristida arizonica Vasey | ARAR6 | Poaceae | |
| Arizona wrightwort | Carlowrightia arizonica Gray | CAAR7 | Acanthaceae | |
| Arizonia orange | Choisya dumosa (Torr.) Gray var. arizonica (Standl.) L. Benson | CHDUA | Rutaceae | |
| Arkansas dozedaisy | Aphanostephus skirrhobasis (DC.) Trel. | APSK | Asteraceae | |
| Arkansas dozedaisy | Aphanostephus skirrhobasis (DC.) Trel. var. kidderi (Blake) B.L. Turner | APSKK | Asteraceae | |
| Arkansas dozedaisy | Aphanostephus skirrhobasis (DC.) Trel. var. skirrhobasis | APSKS | Asteraceae | |
| Arkansas dozedaisy | Aphanostephus skirrhobasis (DC.) Trel. var. thalassius Shinners | APSKT | Asteraceae | |
| Arkansas leastdaisy | Chaetopappa asteroides Nutt. ex DC. | CHAS | Asteraceae | |
| Arkansas leastdaisy | Chaetopappa asteroides Nutt. ex DC. var. asteroides | CHASA | Asteraceae | |
| Arkansas leastdaisy | Chaetopappa asteroides Nutt. ex DC. var. grandis Shinners | CHASG | Asteraceae | |
| Arkansas sedge | Carex arkansana (Bailey) Bailey | CAAR5 | Cyperaceae | |
| armeria | Armeria (DC.) Willd. | ARMER | Plumbaginaceae | |
| armoracia | Armoracia P.G. Gaertn., B. Mey. & Scherb. | ARMOR | Brassicaceae | |
| arnica | Arnica L. | ARNIC | Asteraceae | |
| Arnold hawthorn | Crataegus ×anomala Sarg. (pro sp.) [intricata × mollis] | CRAN6 | Rosaceae | |
| Arnold's disc lichen | Buellia arnoldii Servit & Nadv. | BUAR4 | Physciaceae | |
| arnoseris | Arnoseris Gaertn. | ARNOS | Asteraceae | |
| arrabidaea | Arrabidaea DC. | ARRAB | Bignoniaceae | |
| arracacha | Arracacia xanthorrhiza E.N. Bancroft | ARXA2 | Apiaceae | |
| arracacia | Arracacia E.N. Bancroft | ARRAC2 | Apiaceae | |
| arrowfeather threeawn | Aristida purpurascens Poir. | ARPU8 | Poaceae | |
| arrowfeather threeawn | Aristida purpurascens Poir. var. purpurascens | ARPUP4 | Poaceae | |
| arrowfeather threeawn | Aristida purpurascens Poir. var. tenuispica (A.S. Hitchc.) Allred | ARPUT | Poaceae | |
| arrowfeather threeawn | Aristida purpurascens Poir. var. virgata (Trin.) Allred | ARPUV | Poaceae | |
| arrowhead rattlebox | Crotalaria sagittalis L. | CRSA4 | Fabaceae | |
| arrowleaf balsamroot | Balsamorhiza sagittata (Pursh) Nutt. | BASA3 | Asteraceae | |
| arrowleaf butterfly pea | Centrosema sagittatum (Humb. & Bonpl. ex Willd.) Brandeg. ex Riley | CESA6 | Fabaceae | |
| Arroyo de la Cruz mariposa lily | Calochortus clavatus S. Wats. var. recurvifolius (Hoover) R. Fiedler & P. Zebell | CACLR3 | Liliaceae | |
| arthothelium lichen | Arthothelium A. Massal. | ARTHO3 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium abnorme (Ach.) Mull. Arg. | ARAB5 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium adveniens Nyl. | ARAD4 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium albovirescens (Nyl.) Fink | ARAL19 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium anastomosans (Ach.) Arnold | ARAN12 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium distendens (Nyl.) Mull. Arg. | ARDI22 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium gregarium (Willey) Zahlbr. | ARGR16 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium interveniens (Nyl.) Zahlbr. | ARIN16 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium macrothecum (Fee) A. Massal. | ARMA25 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium orbilliferum (Almq.) Hasse | AROR4 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium pruinascens Zahlbr. | ARPR10 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium ruanun (A. Massal.) Korber | ARRU10 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium sanguineum (Willey) Zahlbr. | ARSA13 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium spectabile A. Massal. | ARSP11 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium subcyrtodes (Willey) Hasse | ARSU19 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium taediosum (Nyl.) Mull. Arg. | ARTA2 | Uncertain Lichen Family | |
| arthothelium lichen | Arthothelium violascens (Nyl.) Zahlbr. | ARVI15 | Uncertain Lichen Family | |
| arthrocnemum | Arthrocnemum Moq. | ARTHR4 | Chenopodiaceae | |
| arthrorhaphis lichen | Arthrorhaphis citrinella (Ach.) Poelt | ARCI60 | Arthrorhaphidaceae | |
| arthrorhaphis lichen | Arthrorhaphis Th. Fr. | ARTHR5 | Arthrorhaphidaceae | |
| arthrostemma | Arthrostemma Pavón ex D. Don | ARTHR3 | Melastomataceae | |
| artocarpus | Artocarpus elasticus Reinw. ex Blume | AREL9 | Moraceae | |
| artocarpus | Artocarpus mariannensis Trecul | ARMA28 | Moraceae | |
| artocarpus | Artocarpus tamaran Becc. | ARTA3 | Moraceae | |
| arum | Arum L. | ARUM2 | Araceae | |
| aruncus | Aruncus L. | ARUNC | Rosaceae | |
| Asahina's cracked lichen | Acarospora asahinae H. Magn. | ACAS3 | Acarosporaceae | |
| Asahina's cup lichen | Cladonia asahinae J. W. Thomson | CLAS5 | Cladoniaceae | |
| asahinea lichen | Asahinea Culb. & C. Culb. | ASAHI2 | Parmeliaceae | |
| ascending wild basil | Clinopodium ascendens (Jord.) Samp. | CLAS4 | Lamiaceae | |
| aschisma moss | Aschisma Lindb. | ASCHI2 | Pottiaceae | |
| Ash Meadows milkvetch | Astragalus phoenix Barneby | ASPH | Fabaceae | |
| Ashby's banksia | Banksia ashbyi Baker f. | BAAS5 | Proteaceae | |
| ashen milkvetch | Astragalus tephrodes Gray | ASTE8 | Fabaceae | |
| ashen milkvetch | Astragalus tephrodes Gray var. brachylobus (Gray) Barneby | ASTEB | Fabaceae | |
| ashen milkvetch | Astragalus tephrodes Gray var. chloridae (M.E. Jones) Barneby | ASTEC | Fabaceae | |
| ashen milkvetch | Astragalus tephrodes Gray var. remulcus (Gray) Barneby | ASTER2 | Fabaceae | |
| ashen milkvetch | Astragalus tephrodes Gray var. tephrodes | ASTET3 | Fabaceae | |
| Ashe's calamint | Clinopodium ashei (Weatherby) Small | CLAS2 | Lamiaceae | |
| ashgray Indian paintbrush | Castilleja cinerea Gray | CACI6 | Scrophulariaceae | |
| Ashland thistle | Cirsium ciliolatum (Henderson) J.T. Howell | CICI | Asteraceae | |
| ashy sandmat | Chamaesyce cinerascens (Engelm.) Small | CHCI2 | Euphorbiaceae | |
| Asian flatsedge | Cyperus amuricus Maxim. | CYAM2 | Cyperaceae | |
| Asian Indian mallow | Abutilon auritum (Wallich ex Link) Sweet | ABAU | Malvaceae | |
| Asian mustard | Brassica tournefortii Gouan | BRTO | Brassicaceae | |
| Asian nakedwood | Colubrina asiatica (L.) Brongn. | COAS3 | Rhamnaceae | |
| Asian pigeonwings | Clitoria ternatea L. | CLTE3 | Fabaceae | |
| Asian spiderflower | Cleome viscosa L. | CLVI9 | Capparaceae | |
| Asian taro | Alocasia odora (Lodd.) G. Don | ALOD3 | Araceae | |
| Asian virginsbower | Clematis florida Thunb. | CLFL | Ranunculaceae | |
| Asian white birch | Betula platyphylla Sukatschev | BEPL2 | Betulaceae | |
| Asian white birch | Betula platyphylla Sukatschev var. platyphylla | BEPLP | Betulaceae | |
| Asiatic dayflower | Commelina communis L. | COCO3 | Commelinaceae | |
| Asiatic dogwood | Cornus officinalis Siebold & Zucc. | COOF3 | Cornaceae | |
| aspalathus | Aspalathus L. | ASPAL2 | Fabaceae | |
| asparagus | Asparagus L. | ASPAR | Liliaceae | |
| aspen onion | Allium bisceptrum S. Wats. var. palmeri (S. Wats.) Cronq. | ALBIP | Liliaceae | |
| asphead | Aspicarpa L.C. Rich. | ASPIC | Malpighiaceae | |
| asphodelus | Asphodelus L. | ASPHO | Liliaceae | |
| asplenium ladyfern | Athyrium filix-femina (L.) Roth ssp. asplenioides (Michx.) Hultén | ATFIA2 | Dryopteridaceae | |
| Assam tea | Camellia sinensis (L.) Kuntze var. assamica (J. Masters) Kitam. | CASIA2 | Theaceae | |
| Assiniboia sedge | Carex assiniboinensis W. Boott | CAAS2 | Cyperaceae | |
| Assyrian plum | Cordia myxa L. | COMY | Boraginaceae | |
| aster | Aster L. | ASTER | Asteraceae | |
| asterophoma lichen | Asterophoma D. Hawksw. | ASTER5 | Mycocaliciaceae | |
| asterophoma lichen | Asterophoma mazaediicola D. Hawksw. | ASMA20 | Mycocaliciaceae | |
| asterothyrium lichen | Asterothyrium decipiens (Rehm) R. Sant. | ASDE20 | Thelotremataceae | |
| asterothyrium lichen | Asterothyrium leucophthalmum (Mull. Arg.) R. Sant. | ASLE25 | Thelotremataceae | |
| asterothyrium lichen | Asterothyrium Mull. Arg. | ASTER6 | Thelotremataceae | |
| asterothyrium lichen | Asterothyrium rotuliforme (Mull. Arg.) Serus. | ASRO8 | Thelotremataceae | |
| asthmaweed | Conyza bonariensis (L.) Cronq. | COBO | Asteraceae | |
| asthmaweed | Conyza floribunda Kunth | COFL | Asteraceae | |
| astomum moss | Astomum Hampe | ASTOM | Pottiaceae | |
| astomum moss | Astomum ludovicianum (Sull.) Sull. | ASLU5 | Pottiaceae | |
| astomum moss | Astomum phascoides (Hook. ex Drumm.) Grout | ASPH7 | Pottiaceae | |
| astripomoea | Astripomoea A. Meeuse | ASTRI | Convolvulaceae | |
| astrophytum | Astrophytum Lem. | ASTRO2 | Cactaceae | |
| astrothelium lichen | Astrothelium Eschw. | ASTRO3 | Trypetheliaceae | |
| astrothelium lichen | Astrothelium galbineum Krempelh. | ASGA8 | Trypetheliaceae | |
| astrothelium lichen | Astrothelium variolosum (Ach.) Mull. Arg. | ASVA6 | Trypetheliaceae | |
| astrothelium lichen | Astrothelium versicolor Mull. Arg. | ASVE13 | Trypetheliaceae | |
| asystasia | Asystasia Blume | ASYST | Acanthaceae | |
| atamisquea | Atamisquea Miers ex Hook. & Arn. | ATAMI | Capparaceae | |
| athelia lichen | Athelia epiphylla Pers. | ATEP | Atheliaceae | |
| athelia lichen | Athelia Pers. | ATHEL | Atheliaceae | |
| Atkinson's tickseed | Coreopsis tinctoria Nutt. var. atkinsoniana (Dougl. ex Lindl.) H.M. Parker ex E.B. Sm. | COTIA | Asteraceae | |
| Atlantic camas | Camassia scilloides (Raf.) Cory | CASC5 | Liliaceae | |
| Atlantic cup lichen | Cladonia atlantica A. Evans | CLAT2 | Cladoniaceae | |
| Atlantic pigeonwings | Clitoria mariana L. | CLMA4 | Fabaceae | |
| Atlantic white cedar | Chamaecyparis thyoides (L.) B.S.P. | CHTH2 | Cupressaceae | |
| atrichoseris | Atrichoseris Gray | ATRIC | Asteraceae | |
| atrichum moss | Atrichum altecristatum (Ren. & Card.) Smyth & Smyth | ATAL6 | Polytrichaceae | |
| atrichum moss | Atrichum angustatum (Brid.) Bruch & Schimp. in B.S.G. | ATAN3 | Polytrichaceae | |
| atrichum moss | Atrichum crispum (James) Sull. | ATCR | Polytrichaceae | |
| atrichum moss | Atrichum P. Beauv. | ATRIC2 | Polytrichaceae | |
| atrichum moss | Atrichum tenellum (Röhl.) Bruch & Schimp. in B.S.G. | ATTE70 | Polytrichaceae | |
| attalea palm | Attalea Kunth | ATTAL | Arecaceae | |
| attenuate Indian paintbrush | Castilleja attenuata (Gray) Chuang & Heckard | CAAT25 | Scrophulariaceae | |
| attorney | Clusia L. | CLUSI | Clusiaceae | |
| Atwood's cryptantha | Cryptantha atwoodii Higgins | CRAT2 | Boraginaceae | |
| Atwood's evening-primrose | Camissonia atwoodii Cronq. | CAAT10 | Onagraceae | |
| auerodendron | Auerodendron Urban | AUERO | Rhamnaceae | |
| Augustin's dotted lichen | Bacidia augustinii (Tuck.) Zahlbr. | BAAU2 | Bacidiaceae | |
| aulacomnium moss | Aulacomnium androgynum (Hedw.) Schwaegr. | AUAN70 | Aulacomniaceae | |
| aulacomnium moss | Aulacomnium heterostichum (Hedw.) Bruch & Schimp. in B.S.G. | AUHE | Aulacomniaceae | |
| aulacomnium moss | Aulacomnium palustre (Hedw.) Schwaegr. | AUPA70 | Aulacomniaceae | |
| aulacomnium moss | Aulacomnium Schwaegr. | AULAC2 | Aulacomniaceae | |
| aulaxina lichen | Aulaxina Fee | AULAX | Gomphillaceae | |
| aulaxina lichen | Aulaxina microphana (Vainio) R. Sant. | AUMI3 | Gomphillaceae | |
| aulaxina lichen | Aulaxina quadrangula (Stirton) R. Sant. | AUQU | Gomphillaceae | |
| aurinia | Aurinia Desv. | AURIN | Brassicaceae | |
| Austin's milkvetch | Astragalus austiniae Gray ex Brewer & S. Wats. | ASAU | Fabaceae | |
| Australian acalypha | Acalypha australis L. | ACAU6 | Euphorbiaceae | |
| Australian amaranth | Amaranthus lineatus R. Br. | AMLI2 | Amaranthaceae | |
| Australian brome | Bromus arenarius Labill. | BRAR3 | Poaceae | |
| Australian fingergrass | Chloris truncata R. Br. | CHTR | Poaceae | |
| Australian flatsedge | Cyperus trinervis R. Br. | CYTR3 | Cyperaceae | |
| Australian fuschia | Correa Andrews, nom. cons. | CORRE | Rutaceae | |
| Australian joint-vetch | Aeschynomene falcata (Poir.) DC. | AEFA2 | Fabaceae | |
| Australian saltbush | Atriplex semibaccata R. Br. | ATSE | Chenopodiaceae | |
| Australian wallaby grass | Amphibromus neesii Steud. | AMNE4 | Poaceae | |
| Australian waterbuttons | Cotula australis (Sieber ex Spreng.) Hook. f. | COAU3 | Asteraceae | |
| Australian windmill grass | Chloris ventricosa R. Br. | CHVE | Poaceae | |
| Austrian chamomile | Anthemis austriaca Jacq. | ANAU3 | Asteraceae | |
| ausubon | Ardisia glauciflora Urban | ARGL11 | Myrsinaceae | |
| autumn coralroot | Corallorhiza odontorhiza (Willd.) Poir. | COOD7 | Orchidaceae | |
| autumn coralroot | Corallorhiza odontorhiza (Willd.) Poir. var. odontorhiza | COODO2 | Orchidaceae | |
| autumn coralroot | Corallorhiza odontorhiza (Willd.) Poir. var. pringlei (Greenm.) Freudenstein | COODP2 | Orchidaceae | |
| autumn crocus | Colchicum autumnale L. | COAU4 | Liliaceae | |
| autumn onion | Allium stellatum Fraser ex Ker-Gawl. | ALST | Liliaceae | |
| avaram | Cassia auriculata L. | CAAU19 | Fabaceae | |
| averrhoa | Averrhoa Adans. | AVERR | Oxalidaceae | |
| avian goosefoot | Chenopodium hircinum Schrad. | CHHI2 | Chenopodiaceae | |
| avispillo | Cinnamomum montanum (Sw.) Bercht. & J. Presl | CIMO3 | Lauraceae | |
| Avon Park rattlebox | Crotalaria avonensis K.R. DeLaney & Wunderlin | CRAV | Fabaceae | |
| 'awikiwiki | Canavalia galeata (Gaud.) Vogel | CAGA | Fabaceae | |
| awl-leaf wattle | Acacia subulata Bonpl. | ACSU10 | Fabaceae | |
| awnless beardgrass | Bothriochloa exaristata (Nash) Henr. | BOEX | Poaceae | |
| awnless leastdaisy | Chaetopappa imberbis (Gray) Nesom | CHIM | Asteraceae | |
| ayahuasca | Banisteriopsis caapi (Spruce ex Griseb.) Morton | BACA12 | Malpighiaceae | |
| ayenia | Ayenia L. | AYENI | Sterculiaceae | |
| azadirachta | Azadirachta A. Juss. | AZADI2 | Meliaceae | |
| azarole | Crataegus azarolus L. | CRAZ | Rosaceae | |
| Aztec gilia | Aliciella formosa (Greene ex Brand) J.M. Porter | ALFO3 | Polemoniaceae | |
| Aztec milkvetch | Astragalus proximus (Rydb.) Woot. & Standl. | ASPR8 | Fabaceae | |
| azulejo | Cornutia pyramidata L. | COPY2 | Verbenaceae |
Source: U. S. Department of Agriculture
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