| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ASTE12 | Aster tenuicaulis (C. Mohr) Burgess | Symphyotrichum patens var. gracile | Asteraceae
|
| ASTEA | Aster tenuifolius L. var. aphyllus R.W. Long | Symphyotrichum bracei | Asteraceae
|
| ASTER3 | Aster tenuifolius L. var. ramosissimus Torr. & Gray | Symphyotrichum lanceolatum ssp. lanceolatum var. lanceolatum | Asteraceae
|
| ASTE2 | Aster tenuifolius L. | Symphyotrichum tenuifolium | Asteraceae
|
| ASTE18 | Aster tephrodes (Gray) Blake | Machaeranthera canescens ssp. canescens var. incana | Asteraceae
|
| ASTEP | Aster texanus Burgess var. parviceps Shinners | Symphyotrichum drummondii var. texanum | Asteraceae
|
| ASTE3 | Aster texanus Burgess | Symphyotrichum drummondii var. texanum | Asteraceae
|
| ASTO4 | Aster tomentellus (Greene) Frye & Rigg, non Hook. | Eucephalus tomentellus | Asteraceae
|
| ASTO7 | Aster tortifolius (Torr. & Gray) Gray, non Michx. | Xylorhiza tortifolia var. tortifolia | Asteraceae
|
| ASTO6 | Aster tortifolius Michx. | Sericocarpus tortifolius | Asteraceae
|
| ASTRS | Aster tradescantii L. var. saxatilis (Fern.) House | Symphyotrichum tradescantii | Asteraceae
|
| ASTRT3 | Aster tradescantii L. var. thyrsoides (Gray) Boivin | Symphyotrichum ontarione | Asteraceae
|
| ASTR3 | Aster tradescantii L. | Symphyotrichum tradescantii | Asteraceae
|
| ASTR15 | Aster triangularis (Burgess) Burgess | Symphyotrichum undulatum | Asteraceae
|
| ASTR80 | Aster tripolium L. | Tripolium pannonicum | Asteraceae
|
| ASTR16 | Aster truellius Burgess | Symphyotrichum undulatum | Asteraceae
|
| ASTU2 | Aster turbinellus Lindl. | Symphyotrichum turbinellum | Asteraceae
|
| ASTW2 | Aster tweedyi Rydb. | Symphyotrichum foliaceum var. canbyi | Asteraceae
|
| ASUMB | Aster umbellatus P. Mill. var. brevisquamis Fern. | Doellingeria infirma | Asteraceae
|
| ASUML | Aster umbellatus P. Mill. var. latifolius Gray | Doellingeria sericocarpoides | Asteraceae
|
| ASUMP | Aster umbellatus P. Mill. var. pubens Gray | Doellingeria umbellata var. pubens | Asteraceae
|
| ASUM | Aster umbellatus P. Mill. | Doellingeria umbellata var. umbellata | Asteraceae
|
| ASUNM | Aster unalaschkensis Hook. var. major Hook. | Canadanthus modestus | Asteraceae
|
| ASUNA | Aster undulatus L. var. asperulus Wood | Symphyotrichum undulatum | Asteraceae
|
| ASUND | Aster undulatus L. var. diversifolius (Michx.) Gray | Symphyotrichum undulatum | Asteraceae
|
| ASUNL | Aster undulatus L. var. loriformis Burgess | Symphyotrichum undulatum | Asteraceae
|
| ASUNT | Aster undulatus L. var. triangularis Burgess | Symphyotrichum undulatum | Asteraceae
|
| ASUN2 | Aster undulatus L. | Symphyotrichum undulatum | Asteraceae
|
| ASUR2 | Aster urophyllus Lindl. | Symphyotrichum urophyllum | Asteraceae
|
| ASVE11 | Aster venustus M.E. Jones | Xylorhiza venusta | Asteraceae
|
| ASVE4 | Aster vernalis Engelm. ex Burgess | Symphyotrichum oolentangiense var. poaceum | Asteraceae
|
| ASVE9 | Aster verutifolius Alexander | Eurybia hemispherica | Asteraceae
|
| ASVI4 | Aster vialis (Bradshaw) Blake | Eucephalus vialis | Asteraceae
|
| ASVI15 | Aster villosus Michx. | Symphyotrichum pilosum var. pilosum | Asteraceae
|
| ASVIS2 | Aster vimineus Lam. var. saxatilis Fern. | Symphyotrichum tradescantii | Asteraceae
|
| ASVIS | Aster vimineus Lam. var. ?subdumosus Wieg. | Symphyotrichum racemosum | Asteraceae
|
| ASVI16 | Aster vimineus Lam. | Symphyotrichum lateriflorum var. lateriflorum | Asteraceae
|
| ASVI5 | Aster ?vimineus auct. non Lam. | Symphyotrichum racemosum | Asteraceae
|
| ASVI14 | Aster violaris Burgess | Eurybia macrophylla | Asteraceae
|
| ASVI13 | Aster virgatus Ell., non Moench | Symphyotrichum laeve var. purpuratum | Asteraceae
|
| ASWA5 | Aster walteri Alexander | Symphyotrichum walteri | Asteraceae
|
| ASWA | Aster wasatchensis (M.E. Jones) Blake | Eurybia wasatchensis | Asteraceae
|
| ASWA8 | Aster watsonii Gray | Erigeron watsonii | Asteraceae
|
| ASWE6 | Aster welshii Cronq. | Symphyotrichum welshii | Asteraceae
|
| ASWI6 | Aster wilsonii Rydb. | Symphyotrichum ciliolatum | Asteraceae
|
| ASWO3 | Aster �woldenii Rydb. (pro sp.) | Symphyotrichum woldenii | Asteraceae
|
| ASWO4 | Aster wootonii (Greene) Greene | Symphyotrichum lanceolatum ssp. hesperium var. hesperium | Asteraceae
|
| ASWR2 | Aster wrightii Gray | Xylorhiza wrightii | Asteraceae
|
| ASXY | Aster xylorhiza (Nutt.) Torr. & Gray | Xylorhiza glabriuscula var. glabriuscula | Asteraceae
|
| ASYO2 | Aster yosemitanus (Gray) Greene | Symphyotrichum spathulatum var. yosemitanum | Asteraceae
|
| ASYU | Aster yukonensis Cronq. | Symphyotrichum yukonense | Asteraceae
|
| ASTER | Aster L. | aster | Asteraceae
|
| ASGR13 | Asterandra grandifolia (L.) Britt. | Phyllanthus juglandifolius | Euphorbiaceae
|
| ASBO9 | Asterella bolanderi (Austin) Underw. | | Aytoniaceae
|
| ASCA40 | Asterella californica (Hampe) Underw. | | Aytoniaceae
|
| ASEC3 | Asterella echinella (Gottsche) Underw. | | Aytoniaceae
|
| ASGR15 | Asterella gracilis (F. Weber) Underw. | | Aytoniaceae
|
| ASLI13 | Asterella lindenbergiana (Corda) Lindb. | | Aytoniaceae
|
| ASPA34 | Asterella palmeri (Austin) Underw. | | Aytoniaceae
|
| ASSA18 | Asterella saccata (Wahl.) A. Evans | | Aytoniaceae
|
| ASTE20 | Asterella tenella (L.) P. Beauv. | | Aytoniaceae
|
| ASTER4 | Asterella P. Beauv. nom. cons. | | Aytoniaceae
|
| ASMA20 | Asterophoma mazaediicola D. Hawksw. | asterophoma lichen | Mycocaliciaceae
|
| ASTER5 | Asterophoma D. Hawksw. | asterophoma | Mycocaliciaceae
|
| ASDE20 | Asterothyrium decipiens (Rehm) R. Sant. | asterothyrium lichen | Thelotremataceae
|
| ASLE25 | Asterothyrium leucophthalmum (Mull. Arg.) R. Sant. | asterothyrium lichen | Thelotremataceae
|
| ASRO8 | Asterothyrium rotuliforme (Mull. Arg.) Serus. | asterothyrium lichen | Thelotremataceae
|
| ASTER6 | Asterothyrium Mull. Arg. | asterothyrium | Thelotremataceae
|
| ASBI4 | Astilbe biternata (Vent.) Britt. | Appalachian false goat's beard | Saxifragaceae
|
| ASCR7 | Astilbe crenatiloba (Britt.) Small | Roan Mountain false goat's beard | Saxifragaceae
|
| ASJA2 | Astilbe japonica (Morr. & Dcne.) Gray | florist's spiraea | Saxifragaceae
|
| ASTIL | Astilbe Buch.-Ham. ex D. Don | false goat's beard | Saxifragaceae
|
| ASLU5 | Astomum ludovicianum (Sull.) Sull. | astomum moss | Pottiaceae
|
| ASMU7 | Astomum muehlenbergianum (Sw.) Grout | Muehlenberg's astomum moss | Pottiaceae
|
| ASNI7 | Astomum nitidulum (C. M�ll.) Sull. & Lesq. | Astomum muehlenbergianum | Pottiaceae
|
| ASOC5 | Astomum occidentale Flow. | western astomum moss | Pottiaceae
|
| ASPH7 | Astomum phascoides (Hook. ex Drumm.) Grout | astomum moss | Pottiaceae
|
| ASSU26 | Astomum sullivantii Bruch & Schimp. in B.S.G. | Astomum muehlenbergianum | Pottiaceae
|
| ASTOM | Astomum Hampe | astomum moss | Pottiaceae
|
| ASABF | Astragalus aboriginorum Richards. var. fastigiorum M.E. Jones | Astragalus australis | Fabaceae
|
| ASABG | Astragalus aboriginorum Richards. var. glabriusculus (Hook.) Rydb. | Astragalus australis | Fabaceae
|
| ASABL | Astragalus aboriginorum Richards. var. lepagei (Hult�n) Boivin | Astragalus australis | Fabaceae
|
| ASABR | Astragalus aboriginorum Richards. var. richardsonii (Sheldon) Boivin | Astragalus australis | Fabaceae
|
| ASAB | Astragalus aboriginorum Richards. | Astragalus australis | Fabaceae
|
| ASACA2 | Astragalus accidens S. Wats. var. accidens | Rogue River milkvetch | Fabaceae
|
| ASACH | Astragalus accidens S. Wats. var. hendersonii M.E. Jones | Henderson's milkvetch | Fabaceae
|
| ASAC | Astragalus accidens S. Wats. | Rogue River milkvetch | Fabaceae
|
| ASAC2 | Astragalus accumbens Sheldon | Zuni milkvetch | Fabaceae
|
| ASAC5 | Astragalus ackermanii Barneby | Ackerman's milkvetch | Fabaceae
|
| ASAC3 | Astragalus acutirostris S. Wats. | sharpkeel milkvetch | Fabaceae
|
| ASAD2 | Astragalus adanus A. Nels. | Boise milkvetch | Fabaceae
|
| ASADR2 | Astragalus adsurgens Pallas ssp. robustior (Hook.) Welsh | Astragalus laxmannii var. robustior | Fabaceae
|
| ASADV | Astragalus adsurgens Pallas ssp. viciifolius (Hult�n) Welsh | Astragalus laxmannii var. tananaicus | Fabaceae
|
| ASADR | Astragalus adsurgens Pallas var. robustior Hook. | Astragalus laxmannii var. robustior | Fabaceae
|
| ASADT | Astragalus adsurgens Pallas var. tananaicus (Hult�n) Barneby | Astragalus laxmannii var. tananaicus | Fabaceae
|
| ASAE | Astragalus aequalis Clokey | Clokey's milkvetch | Fabaceae
|
| ASAG | Astragalus agnicidus Barneby | Humboldt County milkvetch | Fabaceae
|
| ASAG3 | Astragalus agninus Jepson | Astragalus lentiginosus var. borreganus | Fabaceae
|
| ASAG2 | Astragalus agrestis Dougl. ex G. Don | purple milkvetch | Fabaceae
|
| ASAL4 | Astragalus albens Greene | cushenbury milkvetch | Fabaceae
|
| ASAL11 | Astragalus albifolius (M.E. Jones) Abrams | Astragalus lentiginosus var. albifolius | Fabaceae
|