| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ASBRG | Aster brickellioides Greene var. glabratus Greene | Eucephalus glabratus | Asteraceae
|
| ASBR4 | Aster brickellioides Greene | Eucephalus brickellioides | Asteraceae
|
| ASCA48 | Aster caerulescens DC. | Symphyotrichum praealtum var. praealtum | Asteraceae
|
| ASCA21 | Aster calderi Boivin | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| ASCAB2 | Aster campestris Nutt. var. bloomeri (Gray) Gray | Symphyotrichum campestre var. bloomeri | Asteraceae
|
| ASCA6 | Aster campestris Nutt. | Symphyotrichum campestre var. campestre | Asteraceae
|
| ASCA32 | Aster camptosorus Small | Symphyotrichum shortii | Asteraceae
|
| ASCAA3 | Aster canescens Pursh var. aristatus Eastw. | Machaeranthera canescens ssp. glabra var. aristata | Asteraceae
|
| ASCAL2 | Aster canescens Pursh var. latifolius (Gray) Gray | Psilactis asteroides | Asteraceae
|
| ASCAV3 | Aster canescens Pursh var. viscosus (Nutt.) Gray | Machaeranthera canescens ssp. canescens var. canescens | Asteraceae
|
| ASCA25 | Aster canescens Pursh | Machaeranthera canescens ssp. canescens var. canescens | Asteraceae
|
| ASCA18 | Aster carmesinus Burgess | Eurybia divaricata | Asteraceae
|
| ASCA20 | Aster carolinianus Walt. | Ampelaster carolinianus | Asteraceae
|
| ASCA30 | Aster castaneus Burgess | Eurybia divaricata | Asteraceae
|
| ASCH8 | Aster chapmanii Torr. & Gray | Eurybia chapmanii | Asteraceae
|
| ASCH11 | Aster chasei G.N. Jones | Eurybia schreberi | Asteraceae
|
| ASCHA | Aster chilensis Nees ssp. adscendens (Lindl.) Cronq. | Symphyotrichum ascendens | Asteraceae
|
| ASCHH | Aster chilensis Nees ssp. hallii (Gray) Cronq. | Symphyotrichum hallii | Asteraceae
|
| ASCHI | Aster chilensis Nees var. invenustus (Greene) Jepson | Symphyotrichum chilense var. invenustum | Asteraceae
|
| ASCHL | Aster chilensis Nees var. lentus (Greene) Jepson | Symphyotrichum lentum | Asteraceae
|
| ASCHM | Aster chilensis Nees var. medius Jepson | Symphyotrichum chilense var. medium | Asteraceae
|
| ASCHS | Aster chilensis Nees var. sonomensis (Greene) Jepson | Symphyotrichum lentum | Asteraceae
|
| ASCH2 | Aster chilensis Nees | Symphyotrichum chilense var. chilense | Asteraceae
|
| ASCH12 | Aster chinensis L. | Callistephus chinensis | Asteraceae
|
| ASCH3 | Aster chlorolepis Burgess | Eurybia chlorolepis | Asteraceae
|
| ASCI8 | Aster cichoriaceus (Greene) Blake | Machaeranthera canescens ssp. glabra var. aristata | Asteraceae
|
| ASCIC2 | Aster ciliolatus Lindl. var. comatus (Fern.) A.G. Jones | Symphyotrichum ciliolatum | Asteraceae
|
| ASCIM2 | Aster ciliolatus Lindl. var. maccallae (Rydb.) A.G. Jones | Symphyotrichum ciliolatum | Asteraceae
|
| ASCIW | Aster ciliolatus Lindl. var. wilsonii (Rydb.) A.G. Jones | Symphyotrichum ciliolatum | Asteraceae
|
| ASCI | Aster ciliolatus Lindl. | Symphyotrichum ciliolatum | Asteraceae
|
| ASCL5 | Aster claviger Burgess | Symphyotrichum undulatum | Asteraceae
|
| ASCL4 | Aster claytonii Burgess | Eurybia divaricata | Asteraceae
|
| ASCO20 | Aster coerulescens DC. [orthographic variant] | Symphyotrichum praealtum var. praealtum | Asteraceae
|
| ASCO29 | Aster cognatus Hall | Xylorhiza cognata | Asteraceae
|
| ASCO28 | Aster coloradoensis Gray | Machaeranthera coloradoensis var. coloradoensis | Asteraceae
|
| ASCO37 | Aster �columbianus Piper (pro sp.) | Symphyotrichum columbianum | Asteraceae
|
| ASCO26 | Aster commixtus (Nees) Kuntze | Eurybia spectabilis | Asteraceae
|
| ASCO21 | Aster commixtus auct. non (Nees) Kuntze | Eurybia herveyi | Asteraceae
|
| ASCO21 | Aster commixtus auct. non (Nees) Kuntze | Eurybia mirabilis | Asteraceae
|
| ASCOC | Aster commutatus (Torr. & Gray) Gray var. crassulus (Rydb.) Blake | Symphyotrichum falcatum var. crassulum | Asteraceae
|
| ASCOP | Aster commutatus (Torr. & Gray) Gray var. polycephalus Blake, non Aster polycephalus Rydb. | Symphyotrichum falcatum var. commutatum | Asteraceae
|
| ASCO22 | Aster commutatus (Torr. & Gray) Gray | Symphyotrichum falcatum var. commutatum | Asteraceae
|
| ASCO23 | Aster concinnus Willd. | Symphyotrichum laeve var. concinnum | Asteraceae
|
| ASCOS2 | Aster concolor L. var. simulatus (Small) R.W. Long | Symphyotrichum concolor | Asteraceae
|
| ASCO2 | Aster concolor L. | Symphyotrichum concolor | Asteraceae
|
| ASCO24 | Aster conduplicatus Burgess | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| ASCO3 | Aster conspicuus Lindl. | Eurybia conspicua | Asteraceae
|
| ASCO25 | Aster continuus Small | Symphyotrichum patens var. patentissimum | Asteraceae
|
| ASCO36 | Aster cordalenus Henderson | Symphyotrichum eatonii | Asteraceae
|
| ASCOL4 | Aster cordifolius L. ssp. laevigatus (Porter) A.G. Jones | Symphyotrichum lowrieanum | Asteraceae
|
| ASCOS5 | Aster cordifolius L. ssp. sagittifolius (Wedemeyer ex Willd.) A.G. Jones | Symphyotrichum cordifolium | Asteraceae
|
| ASCOF2 | Aster cordifolius L. var. furbishiae Fern. | Symphyotrichum cordifolium | Asteraceae
|
| ASCOI | Aster cordifolius L. var. incisus Britt. | Symphyotrichum cordifolium | Asteraceae
|
| ASCOL2 | Aster cordifolius L. var. laevigatus Porter | Symphyotrichum lowrieanum | Asteraceae
|
| ASCOL3 | Aster cordifolius L. var. lanceolatus Porter | Symphyotrichum cordifolium | Asteraceae
|
| ASCOM3 | Aster cordifolius L. var. moratus (Shinners) Shinners | Symphyotrichum cordifolium | Asteraceae
|
| ASCOP2 | Aster cordifolius L. var. polycephalus Porter | Symphyotrichum cordifolium | Asteraceae
|
| ASCOR | Aster cordifolius L. var. racemiflorus Fern. | Symphyotrichum cordifolium | Asteraceae
|
| ASCOS3 | Aster cordifolius L. var. sagittifolius (Wedemeyer ex Willd.) A.G. Jones | Symphyotrichum cordifolium | Asteraceae
|
| ASCO4 | Aster cordifolius L. | Symphyotrichum cordifolium | Asteraceae
|
| ASCO27 | Aster cordineri A. Nels. | Symphyotrichum falcatum var. commutatum | Asteraceae
|
| ASCO38 | Aster coridifolius Michx. | Symphyotrichum dumosum var. dumosum | Asteraceae
|
| ASCO41 | Aster corrigiatus Burgess | Symphyotrichum undulatum | Asteraceae
|
| ASCO40 | Aster covillei (Greene) Blake ex Peck | Eucephalus ledophyllus var. covillei | Asteraceae
|
| ASCR11 | Aster crassulus Rydb. | Symphyotrichum falcatum var. crassulum | Asteraceae
|
| ASCRA | Aster crenifolius (Fern.) Cronq. var. arcuans (Fern.) Cronq. | Symphyotrichum novi-belgii var. crenifolium | Asteraceae
|
| ASCR8 | Aster crenifolius (Fern.) Cronq. | Symphyotrichum novi-belgii var. crenifolium | Asteraceae
|
| ASCU10 | Aster curtisii Torr. & Gray | Symphyotrichum retroflexum | Asteraceae
|
| ASCU2 | Aster curtus Cronq. | Sericocarpus rigidus | Asteraceae
|
| ASCU12 | Aster curvescens Burgess | Eurybia schreberi | Asteraceae
|
| ASCUL | Aster cusickii Gray var. lyallii Gray | Symphyotrichum hendersonii | Asteraceae
|
| ASCU11 | Aster cusickii Gray | Symphyotrichum cusickii | Asteraceae
|
| ASDE10 | Aster defoliatus Parish | Symphyotrichum defoliatum | Asteraceae
|
| ASDE18 | Aster delectabilis Hall | Symphyotrichum spathulatum var. spathulatum | Asteraceae
|
| ASDEP2 | Aster depauperatus Fern. var. parviceps (Burgess) Fern. | Symphyotrichum parviceps | Asteraceae
|
| ASDE9 | Aster depauperatus Fern. | Symphyotrichum depauperatum | Asteraceae
|
| ASDE17 | Aster deserticola J.F. Macbr. | Symphyotrichum defoliatum | Asteraceae
|
| ASDI9 | Aster diabolicus Piper | Symphyotrichum foliaceum var. parryi | Asteraceae
|
| ASDIT | Aster diffusus Ait. var. thyrsoides Gray | Symphyotrichum ontarione | Asteraceae
|
| ASDIC | Aster divaricatus (Nutt.) Torr. & Gray var. chlorolepis (Burgess) Ahles | Eurybia chlorolepis | Asteraceae
|
| ASDIS | Aster divaricatus (Nutt.) Torr. & Gray var. sandwicensis Gray | Symphyotrichum squamatum | Asteraceae
|
| ASDI17 | Aster divaricatus (Nutt.) Torr. & Gray, non L. | Symphyotrichum divaricatum | Asteraceae
|
| ASDI | Aster divaricatus L. | Eurybia divaricata | Asteraceae
|
| ASDI10 | Aster diversifolius Michx. | Symphyotrichum undulatum | Asteraceae
|
| ASDO2 | Aster douglasii Lindl. | Symphyotrichum subspicatum var. subspicatum | Asteraceae
|
| ASDRP2 | Aster drummondii Lindl. ssp. parviceps (Shinners) A.G. Jones | Symphyotrichum drummondii var. texanum | Asteraceae
|
| ASDRT2 | Aster drummondii Lindl. ssp. texanus (Burgess) A.G. Jones | Symphyotrichum drummondii var. texanum | Asteraceae
|
| ASDRP | Aster drummondii Lindl. var. parviceps (Shinners) A.G. Jones | Symphyotrichum drummondii var. texanum | Asteraceae
|
| ASDRT | Aster drummondii Lindl. var. texanus (Burgess) A.G. Jones | Symphyotrichum drummondii var. texanum | Asteraceae
|
| ASDR | Aster drummondii Lindl. | Symphyotrichum drummondii var. drummondii | Asteraceae
|
| ASDUC | Aster dumosus L. var. coridifolius (Michx.) Torr. & Gray | Symphyotrichum dumosum var. dumosum | Asteraceae
|
| ASDUD | Aster dumosus L. var. dodgei Fern. | Symphyotrichum dumosum var. strictior | Asteraceae
|
| ASDUG2 | Aster dumosus L. var. gracilentus Torr. & Gray | Symphyotrichum dumosum var. dumosum | Asteraceae
|
| ASDUG | Aster dumosus L. var. gracilipes Wieg. | Symphyotrichum dumosum var. gracilipes | Asteraceae
|
| ASDUP | Aster dumosus L. var. pergracilis Wieg. | Symphyotrichum dumosum var. pergracile | Asteraceae
|
| ASDUS | Aster dumosus L. var. strictior Torr. & Gray | Symphyotrichum dumosum var. strictior | Asteraceae
|
| ASDUS2 | Aster dumosus L. var. subulifolius Torr. & Gray | Symphyotrichum dumosum var. subulifolium | Asteraceae
|
| ASDU | Aster dumosus L. | Symphyotrichum dumosum var. dumosum | Asteraceae
|
| ASEA | Aster eatonii (Gray) T.J. Howell | Symphyotrichum eatonii | Asteraceae
|
| ASEL2 | Aster elatus (Greene) Cronq. | Oreostemma elatum | Asteraceae
|
| ASELE | Aster elegans (Nutt.) Torr. & Gray var. engelmannii D.C. Eat. | Eucephalus engelmannii | Asteraceae
|