|
|
|
|
Plant List
Indexed Alphabetically by Common Name
A
For a list of plants indexed by Scientific Name, click here
--Please wait while data loads--
| 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 | |