| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ASSH6 | Asplenium ×shawneense (R.C. Moran) H.E. Ballard | | Aspleniaceae
|
| ASSI6 | Asplenium sintenisii Hieron. | Asplenium rhomboidale | Aspleniaceae
|
| ASSPD | Asplenium sphenolobum Zenker var. diplaziosorum Hieron. | Asplenium macraei | Aspleniaceae
|
| ASSP14 | Asplenium sphenolobum Zenker | Asplenium macraei | Aspleniaceae
|
| ASSP8 | Asplenium sphenotomum Hbd. | Asplenium insiticium | Aspleniaceae
|
| ASST7 | Asplenium ×stotleri Wherry | Asplenium bradleyi | Aspleniaceae
|
| ASSU14 | Asplenium subtile E. St. John | Asplenium curtissii | Aspleniaceae
|
| ASTRQ | Asplenium trichomanes L. ssp. quadrivalens D.E. Mey. | maidenhair spleenwort | Aspleniaceae
|
| ASTRT | Asplenium trichomanes L. ssp. trichomanes | maidenhair spleenwort | Aspleniaceae
|
| ASTR2 | Asplenium trichomanes L. | maidenhair spleenwort | Aspleniaceae
|
| ASTR9 | Asplenium trichomanes-dentatum L. | toothed spleenwort | Aspleniaceae
|
| ASTR10 | Asplenium trichomanes-ramosum L. | brightgreen spleenwort | Aspleniaceae
|
| ASTR11 | Asplenium ×trudellii Wherry (pro sp.) | | Aspleniaceae
|
| ASUN | Asplenium unilaterale Lam. | pamohe | Aspleniaceae
|
| ASUN5 | Asplenium uniseriale Raddi | shinystem spleenwort | Aspleniaceae
|
| ASVA4 | Asplenium varians Wallich ex Hook. & Grev. | variable spleenwort | Aspleniaceae
|
| ASVE6 | Asplenium verecundum Chapman ex Underwood | Asplenium myriophyllum | Aspleniaceae
|
| ASVE3 | Asplenium vespertinum Maxon | western spleenwort | Aspleniaceae
|
| ASVE7 | Asplenium vexans Heller | Athyrium microphyllum | Dryopteridaceae
|
| ASVI7 | Asplenium ×virginicum Maxon | | Aspleniaceae
|
| ASVI10 | Asplenium viride Huds. | Asplenium trichomanes-ramosum | Aspleniaceae
|
| ASWH2 | Asplenium ×wherryi D.M. Sm. | | Aspleniaceae
|
| ASPLE | Asplenium L. | spleenwort | Aspleniaceae
|
| ASBO8 | ×Asplenosorus boydstoniae Walt. | Asplenium boydstoniae | Aspleniaceae
|
| ASEB2 | ×Asplenosorus ebenoides (R.R. Scott) Wherry | Asplenium ebenoides | Aspleniaceae
|
| ASGR9 | ×Asplenosorus gravesii (Maxon) Mickel | Asplenium gravesii | Aspleniaceae
|
| ASHE11 | ×Asplenosorus herb-wagneri (W.C. Taylor & Mohlenbrock) Mickel | Asplenium herb-wagneri | Aspleniaceae
|
| ASIN21 | ×Asplenosorus inexpectatus E.L. Braun ex Friesner | Asplenium inexpectatum | Aspleniaceae
|
| ASKE3 | ×Asplenosorus kentuckiensis (T.N. McCoy) Mickel | Asplenium kentuckiense | Aspleniaceae
|
| ASPI9 | ×Asplenosorus pinnatifidus (Nutt.) Mickel | Asplenium pinnatifidum | Aspleniaceae
|
| ASSH9 | ×Asplenosorus shawneensis R.C. Moran | Asplenium shawneense | Aspleniaceae
|
| ASTR13 | ×Asplenosorus trudellii (Wherry) Mickel | Asplenium trudellii | Aspleniaceae
|
| ASCA23 | Aspris capillaris (Host) A.S. Hitchc. | Aira elegans | Poaceae
|
| ASCA22 | Aspris caryophyllea (L.) Nash | Aira caryophyllea | Poaceae
|
| ASPR14 | Aspris praecox (L.) Nash | Aira praecox | Poaceae
|
| ASAR9 | Astelia argyrocoma Heller ex Skottsberg | silverhair pineapplegrass | Liliaceae
|
| ASDE8 | Astelia degeneri Skottsberg | Astelia menziesiana | Liliaceae
|
| ASFOF | Astelia forbesii Skottsberg ssp. fallax Skottsberg | Astelia menziesiana | Liliaceae
|
| ASFON | Astelia forbesii Skottsberg ssp. nivea Skottsberg | Astelia menziesiana | Liliaceae
|
| ASFOP2 | Astelia forbesii Skottsberg ssp. pachysperma Skottsberg | Astelia menziesiana | Liliaceae
|
| ASFO3 | Astelia forbesii Skottsberg | Astelia menziesiana | Liliaceae
|
| ASMED | Astelia menziesiana Sm. var. depauperata Skottsberg | Astelia menziesiana | Liliaceae
|
| ASME4 | Astelia menziesiana Sm. | pua'akuhinia | Liliaceae
|
| ASVEM | Astelia veratroides Gaud. ssp. macrosperma Skottsberg | Astelia menziesiana | Liliaceae
|
| ASVEG | Astelia veratroides Gaud. var. gracilis Skottsberg | Astelia menziesiana | Liliaceae
|
| ASVE8 | Astelia veratroides Gaud. | Astelia menziesiana | Liliaceae
|
| ASWA4 | Astelia waialealae Wawra | Kauai pa'iniu | Liliaceae
|
| ASTEL | Astelia Banks & Soland. ex R. Br. | pineapplegrass | Liliaceae
|
| ASUT2 | Astephanus utahensis Engelm. | Cynanchum utahense | Asclepiadaceae
|
| ASAB3 | Aster abatus Blake | Xylorhiza tortifolia var. tortifolia | Asteraceae
|
| ASAC10 | Aster acadiensis Shinners | Symphyotrichum lateriflorum var. tenuipes | Asteraceae
|
| ASACM | Aster acuminatus Michx. var. magdalenensis Fern. | Oclemena acuminata | Asteraceae
|
| ASAC6 | Aster acuminatus Michx. | Oclemena acuminata | Asteraceae
|
| ASAD8 | Aster adenolepis Blake | Machaeranthera bigelovii var. mucronata | Asteraceae
|
| ASAD4 | Aster adnatus Nutt. | Symphyotrichum adnatum | Asteraceae
|
| ASAD6 | Aster adscendens Lindl. | Symphyotrichum ascendens | Asteraceae
|
| ASAD7 | Aster adsurgens auct. non Greene | Symphyotrichum falcatum var. crassulum | Asteraceae
|
| ASAG4 | Aster agrostifolius Burgess | Symphyotrichum lateriflorum var. angustifolium | Asteraceae
|
| ASALA3 | Aster alpigenus (Torr. & Gray) Gray ssp. andersonii (Gray) Onno | Oreostemma alpigenum var. andersonii | Asteraceae
|
| ASALH2 | Aster alpigenus (Torr. & Gray) Gray ssp. haydenii (Porter) Cronq. | Oreostemma alpigenum var. haydenii | Asteraceae
|
| ASALA | Aster alpigenus (Torr. & Gray) Gray var. andersonii (Gray) Onno ex M.E. Peck | Oreostemma alpigenum var. andersonii | Asteraceae
|
| ASALH | Aster alpigenus (Torr. & Gray) Gray var. haydenii (Porter) Cronq. | Oreostemma alpigenum var. haydenii | Asteraceae
|
| ASAL2 | Aster alpigenus (Torr. & Gray) Gray | Oreostemma alpigenum var. alpigenum | Asteraceae
|
| ASALV2 | Aster alpinus L. ssp. vierhapperi Onno | Aster alpinus var. vierhapperi | Asteraceae
|
| ASALV | Aster alpinus L. var. vierhapperi (Onno) Cronq. | Vierhapper's aster | Asteraceae
|
| ASAL3 | Aster alpinus L. | alpine aster | Asteraceae
|
| ASAM7 | Aster ×amethystinus Nutt. (pro sp.) | Symphyotrichum amethystinum | Asteraceae
|
| ASAM9 | Aster amplifolius (Woot. & Standl.) Kittell | Psilactis asteroides | Asteraceae
|
| ASAN12 | Aster andersonii (Gray) Gray | Oreostemma alpigenum var. andersonii | Asteraceae
|
| ASAN | Aster anomalus Engelm. | Symphyotrichum anomalum | Asteraceae
|
| ASAN13 | Aster anticostensis Fern. | Symphyotrichum anticostense | Asteraceae
|
| ASAP2 | Aster apricus (Gray) Rydb. | Symphyotrichum foliaceum var. apricum | Asteraceae
|
| ASAQ3 | Aster aquifolius (Greene ex Woot. & Standl.) Blake | Machaeranthera bigelovii var. bigelovii | Asteraceae
|
| ASAR13 | Aster arenosus (Heller) Blake | Chaetopappa ericoides | Asteraceae
|
| ASASF | Aster ascendens Lindl. var. fremontii Torr. & Gray | Symphyotrichum spathulatum var. spathulatum | Asteraceae
|
| ASASP | Aster ascendens Lindl. var. parryi D.C. Eat. | Symphyotrichum foliaceum var. parryi | Asteraceae
|
| ASASY | Aster ascendens Lindl. var. yosemitanus Gray | Symphyotrichum spathulatum var. yosemitanum | Asteraceae
|
| ASAS5 | Aster ascendens Lindl. | Symphyotrichum ascendens | Asteraceae
|
| ASAS8 | Aster asperifolius Burgess | Symphyotrichum undulatum | Asteraceae
|
| ASAS10 | Aster asteroides (L.) MacMillan | Sericocarpus asteroides | Asteraceae
|
| ASAT5 | Aster attenuatus (T.J. Howell) M.E. Peck, non Lindl. ex Hook. | Machaeranthera canescens ssp. canescens var. incana | Asteraceae
|
| ASAT3 | Aster attenuatus auct. non Lindl. ex Hook. | Symphyotrichum laeve var. purpuratum | Asteraceae
|
| ASAV | Aster avitus Alexander | Eurybia avita | Asteraceae
|
| ASAZP | Aster azureus Lindl. var. poaceus (Burgess) Fern. | Symphyotrichum oolentangiense var. poaceum | Asteraceae
|
| ASAZ | Aster azureus Lindl. | Symphyotrichum oolentangiense var. oolentangiense | Asteraceae
|
| ASBA4 | Aster ×batesii Rydb. (pro sp.) | Symphyotrichum batesii | Asteraceae
|
| ASBE7 | Aster behringensis Gandog. | Eurybia merita | Asteraceae
|
| ASBE8 | Aster bellidiflorus Willd. | Symphyotrichum lanceolatum ssp. lanceolatum var. lanceolatum | Asteraceae
|
| ASBE | Aster bernardinus Hall | Symphyotrichum defoliatum | Asteraceae
|
| ASBI7 | Aster bifoliatus (Walt.) Ahles | Sericocarpus tortifolius | Asteraceae
|
| ASBI9 | Aster bigelovii Gray | Machaeranthera bigelovii var. bigelovii | Asteraceae
|
| ASBL7 | Aster blakei (Porter) House | Oclemena blakei | Asteraceae
|
| ASBL2 | Aster blepharophyllus Gray | Machaeranthera gypsitherma | Asteraceae
|
| ASBL5 | Aster bloomeri Gray | Symphyotrichum campestre var. bloomeri | Asteraceae
|
| ASBO4 | Aster boltoniae Greene | Psilactis asteroides | Asteraceae
|
| ASBO7 | Aster borealis (Torr. & Gray) Prov. | Symphyotrichum boreale | Asteraceae
|
| ASBO5 | Aster boykinii Burgess | Eurybia divaricata | Asteraceae
|
| ASBR16 | Aster bracei Britt. ex Small | Symphyotrichum bracei | Asteraceae
|
| ASBR3 | Aster brachyactis Blake | Symphyotrichum ciliatum | Asteraceae
|
| ASBR10 | Aster ?brachypholis Small | Symphyotrichum racemosum | Asteraceae
|
| ASBR11 | Aster bracteolatus auct. non Nutt. p.p. | Symphyotrichum eatonii | Asteraceae
|