| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ASUM3 | Astragalus umbraticus Sheldon | Bald Mountain milkvetch | Fabaceae
|
| ASUN3 | Astragalus uncialis Barneby | currant milkvetch | Fabaceae
|
| ASUT | Astragalus utahensis (Torr.) Torr. & Gray | Utah milkvetch | Fabaceae
|
| ASVA2 | Astragalus vaccarum Gray | Cow Spring milkvetch | Fabaceae
|
| ASVA3 | Astragalus vallaris M.E. Jones | Snake canyon milkvetch | Fabaceae
|
| ASVAJ | Astragalus vaseyi S. Wats. var. johnstonii Munz & McBurney ex Munz | Astragalus palmeri | Fabaceae
|
| ASVAM | Astragalus vaseyi S. Wats. var. metanus (M.E. Jones) Munz & McBurney | Astragalus palmeri | Fabaceae
|
| ASVA5 | Astragalus vaseyi S. Wats. | Astragalus palmeri | Fabaceae
|
| ASVE10 | Astragalus ventosus Suksdorf ex Rydb. | Astragalus purshii var. glareosus | Fabaceae
|
| ASVEN | Astragalus vexilliflexus Sheldon var. nubilus Barneby | White Clouds milkvetch | Fabaceae
|
| ASVEV2 | Astragalus vexilliflexus Sheldon var. vexilliflexus | bentflower milkvetch | Fabaceae
|
| ASVE5 | Astragalus vexilliflexus Sheldon | bentflower milkvetch | Fabaceae
|
| ASVI6 | Astragalus villosus Michx. | bearded milkvetch | Fabaceae
|
| ASVI12 | Astragalus viridis (Nutt.) Sheldon | Astragalus kentrophyta var. kentrophyta | Fabaceae
|
| ASWA2 | Astragalus wardii Gray | Ward's milkvetch | Fabaceae
|
| ASWA3 | Astragalus waterfallii Barneby | Waterfall's milkvetch | Fabaceae
|
| ASWA7 | Astragalus watsonii Sheldon | Astragalus accidens var. hendersonii | Fabaceae
|
| ASWE | Astragalus webberi Gray ex Brewer & S. Wats. | Webber's milkvetch | Fabaceae
|
| ASWE5 | Astragalus weiserensis (M.E. Jones) Abrams | Astragalus beckwithii var. weiserensis | Fabaceae
|
| ASWE4 | Astragalus welshii Barneby | Loa milkvetch | Fabaceae
|
| ASWE2 | Astragalus wetherillii M.E. Jones | Wetherill's milkvetch | Fabaceae
|
| ASWHB | Astragalus whitedii Piper var. brachycodon Barneby | Astragalus curvicarpus var. brachycodon | Fabaceae
|
| ASWH3 | Astragalus whitedii Piper | Astragalus sinuatus | Fabaceae
|
| ASWHH | Astragalus whitneyi Gray ssp. hookerianus (Torr. & Gray) Abrams | Astragalus whitneyi var. sonneanus | Fabaceae
|
| ASWHP | Astragalus whitneyi Gray ssp. pinosus (Elmer) Abrams | Astragalus whitneyi var. whitneyi | Fabaceae
|
| ASWHS3 | Astragalus whitneyi Gray ssp. siskiyouensis (Rydb.) Abrams | Astragalus whitneyi var. siskiyouensis | Fabaceae
|
| ASWHC | Astragalus whitneyi Gray var. confusus Barneby | conelike milkvetch | Fabaceae
|
| ASWHL | Astragalus whitneyi Gray var. lenophyllus (Rydb.) Barneby | balloonpod milkvetch | Fabaceae
|
| ASWHS | Astragalus whitneyi Gray var. siskiyouensis (Rydb.) Barneby | Siskiyou milkvetch | Fabaceae
|
| ASWHS2 | Astragalus whitneyi Gray var. sonneanus (Greene) Jepson | balloonpod milkvetch | Fabaceae
|
| ASWHW | Astragalus whitneyi Gray var. whitneyi | balloonpod milkvetch | Fabaceae
|
| ASWH | Astragalus whitneyi Gray | balloonpod milkvetch | Fabaceae
|
| ASWI | Astragalus williamsii Rydb. | Williams' milkvetch | Fabaceae
|
| ASWI2 | Astragalus wingatanus S. Wats. | Fort Wingate milkvetch | Fabaceae
|
| ASWI3 | Astragalus wittmannii Barneby | Wittmann's milkvetch | Fabaceae
|
| ASWO | Astragalus woodruffii M.E. Jones | Woodruff's milkvetch | Fabaceae
|
| ASWOA | Astragalus wootonii Sheldon var. aquilonius Barneby | Astragalus aquilonius | Fabaceae
|
| ASWOE | Astragalus wootonii Sheldon var. endopterus Barneby | Astragalus endopterus | Fabaceae
|
| ASWOT | Astragalus wootonii Sheldon var. typicus Barneby | Astragalus allochrous var. playanus | Fabaceae
|
| ASWO2 | Astragalus wootonii Sheldon | Astragalus allochrous var. playanus | Fabaceae
|
| ASWR | Astragalus wrightii Gray | Wright's milkvetch | Fabaceae
|
| ASXI | Astragalus xiphoides (Barneby) Barneby | gladiator milkvetch | Fabaceae
|
| ASYO | Astragalus yoder-williamsii Barneby | Osgood Mountain milkvetch | Fabaceae
|
| ASYU2 | Astragalus yukonis M.E. Jones | Astragalus bodinii | Fabaceae
|
| ASZIV | Astragalus zionis M.E. Jones var. vigulus Welsh | Zion milkvetch | Fabaceae
|
| ASZIZ | Astragalus zionis M.E. Jones var. zionis | Zion milkvetch | Fabaceae
|
| ASZI | Astragalus zionis M.E. Jones | Zion milkvetch | Fabaceae
|
| ASTRA | Astragalus L. | milkvetch | Fabaceae
|
| ASINC | Astranthium integrifolium (Michx.) Nutt. ssp. ciliatum (Raf.) DeJong | entireleaf western daisy | Asteraceae
|
| ASINI2 | Astranthium integrifolium (Michx.) Nutt. ssp. integrifolium | entireleaf western daisy | Asteraceae
|
| ASINC2 | Astranthium integrifolium (Michx.) Nutt. var. ciliatum (Raf.) Larsen | Astranthium integrifolium ssp. ciliatum | Asteraceae
|
| ASINR | Astranthium integrifolium (Michx.) Nutt. var. robustum Shinners | Astranthium robustum | Asteraceae
|
| ASINT2 | Astranthium integrifolium (Michx.) Nutt. var. triflorum (Raf.) Shinners | Astranthium integrifolium ssp. ciliatum | Asteraceae
|
| ASIN9 | Astranthium integrifolium (Michx.) Nutt. | entireleaf western daisy | Asteraceae
|
| ASRO2 | Astranthium robustum (Shinners) DeJong | Texas western daisy | Asteraceae
|
| ASTRA2 | Astranthium Nutt. | western daisy | Asteraceae
|
| ASGR17 | Astripomoea grantii (Rendle) Verdc. | | Convolvulaceae
|
| ASHY9 | Astripomoea hyoscyamoides (Vatke) Verdc. | | Convolvulaceae
|
| ASTRI | Astripomoea A. Meeuse | astripomoea | Convolvulaceae
|
| ASCOA2 | Astrolepis cochisensis (Goodding) Benham & Windham ssp. arizonica Benham | Arizona scaly cloakfern | Pteridaceae
|
| ASCOC2 | Astrolepis cochisensis (Goodding) Benham & Windham ssp. chihuahuaensis Benham | Chihuahua scaly cloakfern | Pteridaceae
|
| ASCOC3 | Astrolepis cochisensis (Goodding) Benham & Windham ssp. cochisensis | Cochise scaly cloakfern | Pteridaceae
|
| ASCO42 | Astrolepis cochisensis (Goodding) Benham & Windham | Cochise scaly cloakfern | Pteridaceae
|
| ASIN19 | Astrolepis integerrima (Hook.) Benham & Windham | hybrid cloakfern | Pteridaceae
|
| ASSIM2 | Astrolepis sinuata (Lag. ex Sw.) Benham & Windham ssp. mexicana Benham | Mexican scaly cloakfern | Pteridaceae
|
| ASSIS | Astrolepis sinuata (Lag. ex Sw.) Benham & Windham ssp. sinuata | wavy scaly cloakfern | Pteridaceae
|
| ASSI9 | Astrolepis sinuata (Lag. ex Sw.) Benham & Windham | wavy scaly cloakfern | Pteridaceae
|
| ASWI4 | Astrolepis windhamii Benham | Windham's scaly cloakfern | Pteridaceae
|
| ASTRO | Astrolepis Benham & Windham | cloakfern | Pteridaceae
|
| ASKU2 | Astronidium kusaianum Hosokawa | | Melastomataceae
|
| ASPI11 | Astronidium pickeringii (A. Gray) Christophersen | | Melastomataceae
|
| ASPO12 | Astronidium ponapense (Kanehira) Markgraf | | Melastomataceae
|
| ASTRO4 | Astronidium Gray | | Melastomataceae
|
| ASAS6 | Astrophytum asterias (Zucc.) Lem. | sanddollar | Cactaceae
|
| ASMY3 | Astrophytum myriostigma Lem. | | Cactaceae
|
| ASOR9 | Astrophytum ornatum (DC.) Britton & Rose | bishop's hat | Cactaceae
|
| ASTRO2 | Astrophytum Lem. | astrophytum | Cactaceae
|
| ASCI11 | Astrothelium cinnamomeum (Eschw.) Mull. Arg. | | Trypetheliaceae
|
| ASCO47 | Astrothelium confusum Mull. Arg. | | Trypetheliaceae
|
| ASCO48 | Astrothelium conicum auct. | Astrothelium cinnamomeum | Trypetheliaceae
|
| ASDI16 | Astrothelium diplocarpum Nyl. | | Trypetheliaceae
|
| ASGA8 | Astrothelium galbineum Krempelh. | | Trypetheliaceae
|
| ASOC4 | Astrothelium ochrothelizum Mull. Arg. | Astrothelium galbineum | Trypetheliaceae
|
| ASVA6 | Astrothelium variolosum (Ach.) Mull. Arg. | | Trypetheliaceae
|
| ASVE13 | Astrothelium versicolor Mull. Arg. | | Trypetheliaceae
|
| ASTRO3 | Astrothelium Eschw. | astrothelium | Trypetheliaceae
|
| ASPR10 | Asyneuma prenanthoides (Dur.) McVaugh | California harebell | Campanulaceae
|
| ASYNE | Asyneuma Griseb. & Schenk | harebell | Campanulaceae
|
| ASCO34 | Asystasia coromandeliana Nees | Asystasia gangetica | Acanthaceae
|
| ASGA2 | Asystasia gangetica (L.) T. Anders. | Chinese violet | Acanthaceae
|
| ASYST | Asystasia Blume | asystasia | Acanthaceae
|
| ATEM | Atamisquea emarginata Miers ex Hook. & Arn. | vomitbush | Capparaceae
|
| ATAMI | Atamisquea Miers ex Hook. & Arn. | atamisquea | Capparaceae
|
| ATAT | Atamosco atamasca (L.) Greene | Zephyranthes atamasca var. atamasca | Liliaceae
|
| ATCA3 | Atamosco candida (Lindl.) Small | Zephyranthes candida | Liliaceae
|
| ATCA4 | Atamosco carinata (Herbert) P. Wilson | Zephyranthes grandiflora | Liliaceae
|
| ATLO2 | Atamosco longifolia (Hemsl.) Cockerell | Zephyranthes longifolia | Liliaceae
|
| ATRO2 | Atamosco rosea (Lindl.) Greene | Zephyranthes rosea | Liliaceae
|
| ATSI | Atamosco simpsonii (Chapman) Greene | Zephyranthes simpsonii | Liliaceae
|
| ATTR4 | Atamosco treatiae (S. Wats.) Greene | Zephyranthes atamasca var. treatiae | Liliaceae
|
| ATTU2 | Atamosco tubispatha auct. non (L'H�r.) G. Maza | Zephyranthes puertoricensis | Liliaceae
|