| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ASPUC3 | Aster puniceus L. var. calvus Shinners | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| ASPUC4 | Aster puniceus L. var. compactus Fern. | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| ASPUD | Aster puniceus L. var. demissus Lindl. | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| ASPUE | Aster puniceus L. var. elliottii (Torr. & Gray) A.G. Jones | Symphyotrichum elliotii | Asteraceae
|
| ASPUF | Aster puniceus L. var. firmus (Nees) Torr. & Gray | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| ASPUL4 | Aster puniceus L. var. lucidulus Gray | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| ASPUO2 | Aster puniceus L. var. oligocephalus Fern. | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| ASPUP3 | Aster puniceus L. var. perlongus Fern. | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| ASPUS2 | Aster puniceus L. var. scabricaulis (Shinners) A.G. Jones | Symphyotrichum puniceum var. scabricaule | Asteraceae
|
| ASPU5 | Aster puniceus L. | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| ASPU11 | Aster purpuratus Nees | Symphyotrichum laeve var. purpuratum | Asteraceae
|
| ASRA7 | Aster racemosus Ell. | Symphyotrichum racemosum | Asteraceae
|
| ASRAS | Aster radula Ait. var. strictus (Pursh) Gray | Eurybia radula | Asteraceae
|
| ASRA8 | Aster radula Ait. | Eurybia radula | Asteraceae
|
| ASRA | Aster radulinus Gray | Eurybia radulina | Asteraceae
|
| ASRA10 | Aster ramosissimus auct. non P. Mill. | Symphyotrichum pilosum var. pilosum | Asteraceae
|
| ASRA9 | Aster ramulosus Lindl. | Symphyotrichum falcatum var. falcatum | Asteraceae
|
| ASRE8 | Aster reticulatus Pursh | Oclemena reticulata | Asteraceae
|
| ASRE9 | Aster retroflexus Lindl. ex DC. | Symphyotrichum retroflexum | Asteraceae
|
| ASRI6 | Aster richardsonii Spreng. | Eurybia merita | Asteraceae
|
| ASRI5 | Aster riciniatus Burgess | Eurybia macrophylla | Asteraceae
|
| ASRI3 | Aster riparius Kunth | Machaeranthera riparia | Asteraceae
|
| ASRO5 | Aster robynsianus Rouss. | Symphyotrichum robynsianum | Asteraceae
|
| ASRO4 | Aster rolandii Shinners | Symphyotrichum novi-belgii var. crenifolium | Asteraceae
|
| ASRO3 | Aster roscidus Burgess | Eurybia macrophylla | Asteraceae
|
| ASRU10 | Aster rubrotinctus Blake | Machaeranthera bigelovii var. bigelovii | Asteraceae
|
| ASSAD2 | Aster sagittifolius Wedemeyer ex Willd. var. drummondii (Lindl.) Shinners | Symphyotrichum drummondii var. drummondii | Asteraceae
|
| ASSAU | Aster sagittifolius Wedemeyer ex Willd. var. urophyllus (Lindl.) Burgess | Symphyotrichum urophyllum | Asteraceae
|
| ASSA | Aster sagittifolius Wedemeyer ex Willd. | Symphyotrichum cordifolium | Asteraceae
|
| ASSA13 | Aster sagittifolius auct. non Wedemeyer ex Willd. | Symphyotrichum urophyllum | Asteraceae
|
| ASSA11 | Aster salicifolius Ait., non Lam. | Symphyotrichum praealtum var. praealtum | Asteraceae
|
| ASSA12 | Aster salicifolius sensu Willd., non Lam. nec Ait. | Symphyotrichum novi-belgii var. novi-belgii | Asteraceae
|
| ASSA7 | Aster sandwicensis (Gray) Hieron. | Symphyotrichum squamatum | Asteraceae
|
| ASSA10 | Aster saundersii Burgess | Symphyotrichum ciliolatum | Asteraceae
|
| ASSA14 | Aster saxatilis (Fern.) Blanch. nom. illeg. | Symphyotrichum tradescantii | Asteraceae
|
| ASSA9 | Aster saxicastellii J.N. Campbell & M. Medley | Eurybia saxicastellii | Asteraceae
|
| ASSC | Aster scabricaulis Shinners | Symphyotrichum puniceum var. scabricaule | Asteraceae
|
| ASSC10 | Aster �schistosus Steele (pro sp.) | Symphyotrichum schistosum | Asteraceae
|
| ASSC2 | Aster schreberi Nees | Eurybia schreberi | Asteraceae
|
| ASSC3 | Aster scopulorum Gray | Ionactis alpina | Asteraceae
|
| ASSEM | Aster sericeus Vent. var. microphyllus DC. | Symphyotrichum pratense | Asteraceae
|
| ASSE2 | Aster sericeus Vent. | Symphyotrichum sericeum | Asteraceae
|
| ASSE10 | Aster sericocarpoides (Small) K. Schum. | Doellingeria sericocarpoides | Asteraceae
|
| ASSHE | Aster shastensis (Gray) Gray var. eradiatus Gray | Machaeranthera canescens ssp. canescens var. shastensis | Asteraceae
|
| ASSHG | Aster shastensis (Gray) Gray var. glossophyllus (Piper) Cronq. | Machaeranthera canescens ssp. canescens var. canescens | Asteraceae
|
| ASSHL | Aster shastensis (Gray) Gray var. latifolius Cronq. | Machaeranthera canescens ssp. canescens var. canescens | Asteraceae
|
| ASSH10 | Aster shastensis (Gray) Gray | Machaeranthera canescens ssp. canescens var. shastensis | Asteraceae
|
| ASSH | Aster shortii Lindl. | Symphyotrichum shortii | Asteraceae
|
| ASSIR2 | Aster sibiricus L. ssp. richardsonii (Spreng.) A.& D. L�ve | Eurybia merita | Asteraceae
|
| ASSIG | Aster sibiricus L. var. giganteus (Hook.) Gray | Eurybia merita | Asteraceae
|
| ASSIM | Aster sibiricus L. var. meritus (A. Nels.) Raup | Eurybia merita | Asteraceae
|
| ASSI | Aster sibiricus L. | Eurybia sibirica | Asteraceae
|
| ASSI7 | Aster simmondsii Small | Symphyotrichum simmondsii | Asteraceae
|
| ASSIE | Aster simplex Willd. var. estuarinus Boivin | Symphyotrichum lanceolatum ssp. lanceolatum var. lanceolatum | Asteraceae
|
| ASSII | Aster simplex Willd. var. interior (Wieg.) Cronq. | Symphyotrichum lanceolatum ssp. lanceolatum var. interior | Asteraceae
|
| ASSIR | Aster simplex Willd. var. ramosissimus (Torr. & Gray) Cronq. | Symphyotrichum lanceolatum ssp. lanceolatum var. lanceolatum | Asteraceae
|
| ASSI2 | Aster simplex Willd. | Symphyotrichum lanceolatum ssp. lanceolatum var. lanceolatum | Asteraceae
|
| ASSI10 | Aster simulatus Small | Symphyotrichum concolor | Asteraceae
|
| ASSI8 | Aster siskiyouensis A. Nels. & J.F. Macbr. | Eucephalus glabratus | Asteraceae
|
| ASSM | Aster smallii Alexander | Eurybia spectabilis | Asteraceae
|
| ASSO2 | Aster solidagineus Michx. | Sericocarpus linifolius | Asteraceae
|
| ASSO6 | Aster sonomensis Greene | Symphyotrichum lentum | Asteraceae
|
| ASSO7 | Aster sonorae Gray | Machaeranthera riparia | Asteraceae
|
| ASSP10 | Aster spatelliformis Burgess | Symphyotrichum lateriflorum var. spatelliforme | Asteraceae
|
| ASSP16 | Aster spathulatus Lindl. | Symphyotrichum spathulatum var. spathulatum | Asteraceae
|
| ASSPC | Aster spectabilis Ait. var. cinerascens Blake | Eurybia spectabilis | Asteraceae
|
| ASSPS2 | Aster spectabilis Ait. var. suffultus Fern. | Eurybia spectabilis | Asteraceae
|
| ASSP11 | Aster spectabilis Ait. | Eurybia spectabilis | Asteraceae
|
| ASSP3 | Aster spinosus Benth. | Chloracantha spinosa | Asteraceae
|
| ASSP12 | Aster spinulosus Chapman | Eurybia spinulosa | Asteraceae
|
| ASSQ4 | Aster squamatus (Spreng.) Hieron. | Symphyotrichum squamatum | Asteraceae
|
| ASSQ2 | Aster squarrosus sensu Walt., non All. | Symphyotrichum walteri | Asteraceae
|
| ASST13 | Aster standleyi A. Davids. | Xylorhiza cognata | Asteraceae
|
| ASST18 | Aster steeleorum Shinners | Symphyotrichum laeve var. laeve | Asteraceae
|
| ASST3 | Aster stenomeres Gray | Ionactis stenomeres | Asteraceae
|
| ASST16 | Aster stilettiformis Burgess | Eurybia divaricata | Asteraceae
|
| ASST19 | Aster stricticaulis (Torr. & Gray) Rydb. | Symphyotrichum ericoides var. stricticaule | Asteraceae
|
| ASST17 | Aster strictus Pursh, non Poir. | Eurybia radula | Asteraceae
|
| ASSU16 | Aster subasper Lindl. | Symphyotrichum praealtum var. subasperum | Asteraceae
|
| ASSU10 | Aster subgeminatus (Fern.) Boivin | Symphyotrichum ciliolatum | Asteraceae
|
| ASSU15 | Aster subgriseus Rydb. | Symphyotrichum ascendens | Asteraceae
|
| ASSU17 | Aster subsessilis Burgess | Symphyotrichum patens var. patentissimum | Asteraceae
|
| ASSUA2 | Aster subspicatus Nees var. apricus (Gray) Boivin | Symphyotrichum foliaceum var. apricum | Asteraceae
|
| ASSUG | Aster subspicatus Nees var. grayi (Suksdorf) Cronq. | Symphyotrichum subspicatum var. grayi | Asteraceae
|
| ASSU4 | Aster subspicatus Nees | Symphyotrichum subspicatum var. subspicatum | Asteraceae
|
| ASSUA | Aster subulatus Michx. var. australis (Gray) Shinners | Symphyotrichum squamatum | Asteraceae
|
| ASSUC | Aster subulatus Michx. var. cubensis (DC.) Shinners | Symphyotrichum expansum | Asteraceae
|
| ASSUE2 | Aster subulatus Michx. var. elongatus Bosserd. | Symphyotrichum bahamense | Asteraceae
|
| ASSUE | Aster subulatus Michx. var. euroauster Fern. & Grisc. | Symphyotrichum subulatum | Asteraceae
|
| ASSUL | Aster subulatus Michx. var. ligulatus Shinners | Symphyotrichum divaricatum | Asteraceae
|
| ASSUO | Aster subulatus Michx. var. obtusifolius Fern. | Symphyotrichum subulatum | Asteraceae
|
| ASSUS2 | Aster subulatus Michx. var. sandwicensis (Gray) A.G. Jones | Symphyotrichum squamatum | Asteraceae
|
| ASSU5 | Aster subulatus Michx. | Symphyotrichum subulatum | Asteraceae
|
| ASSU18 | Aster sulznerae Small | Symphyotrichum simmondsii | Asteraceae
|
| ASSU9 | Aster surculosus Michx. | Eurybia surculosa | Asteraceae
|
| ASSY2 | Aster sylvestris Burgess | Symphyotrichum undulatum | Asteraceae
|
| ASTA3 | Aster tagetinus (Greene) Blake | Machaeranthera tagetina | Asteraceae
|
| ASTA4 | Aster tanacetifolius Kunth | Machaeranthera tanacetifolia | Asteraceae
|
| ASTAV | Aster tardiflorus L. var. vestitus Fern. | Symphyotrichum novi-belgii var. villicaule | Asteraceae
|
| ASTA | Aster tataricus L. f. | Tatarian aster | Asteraceae
|
| ASTE17 | Aster tenebrosus Burgess | Eurybia divaricata | Asteraceae
|