| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| SYORO | Symphoricarpos oreophilus Gray var. oreophilus | mountain snowberry | Caprifoliaceae
|
| SYORP | Symphoricarpos oreophilus Gray var. parishii (Rydb.) Cronq. | Symphoricarpos rotundifolius var. parishii | Caprifoliaceae
|
| SYORU | Symphoricarpos oreophilus Gray var. utahensis (Rydb.) A. Nels. | Utah snowberry | Caprifoliaceae
|
| SYOR2 | Symphoricarpos oreophilus Gray | mountain snowberry | Caprifoliaceae
|
| SYPA | Symphoricarpos palmeri G.N. Jones | Palmer's snowberry | Caprifoliaceae
|
| SYPA2 | Symphoricarpos parishii Rydb. | Symphoricarpos rotundifolius var. parishii | Caprifoliaceae
|
| SYPA3 | Symphoricarpos pauciflorus W.J. Robins. ex Gray | Symphoricarpos albus var. albus | Caprifoliaceae
|
| SYRA80 | Symphoricarpos racemosus Michx. | Symphoricarpos albus var. albus | Caprifoliaceae
|
| SYRI2 | Symphoricarpos rivularis Suksdorf | Symphoricarpos albus var. laevigatus | Caprifoliaceae
|
| SYROO | Symphoricarpos rotundifolius Gray var. oreophilus (Gray) M.E. Jones | Symphoricarpos oreophilus var. oreophilus | Caprifoliaceae
|
| SYROP | Symphoricarpos rotundifolius Gray var. parishii (Rydb.) Dempster | Parish's snowberry | Caprifoliaceae
|
| SYROR | Symphoricarpos rotundifolius Gray var. rotundifolius | roundleaf snowberry | Caprifoliaceae
|
| SYRO | Symphoricarpos rotundifolius Gray | roundleaf snowberry | Caprifoliaceae
|
| SYSY | Symphoricarpos symphoricarpos (L.) MacM. | Symphoricarpos orbiculatus | Caprifoliaceae
|
| SYTE2 | Symphoricarpos tetonensis A. Nels. | Symphoricarpos oreophilus var. utahensis | Caprifoliaceae
|
| SYUT | Symphoricarpos utahensis Rydb. | Symphoricarpos oreophilus var. utahensis | Caprifoliaceae
|
| SYVA | Symphoricarpos vaccinioides Rydb. | Symphoricarpos oreophilus var. utahensis | Caprifoliaceae
|
| SYMPH | Symphoricarpos Duham. | snowberry | Caprifoliaceae
|
| SYAD | Symphyotrichum adnatum (Nutt.) Nesom | scaleleaf aster | Asteraceae
|
| SYAM3 | Symphyotrichum �amethystinum (Nutt.) Nesom | | Asteraceae
|
| SYAN2 | Symphyotrichum anomalum (Engelm.) Nesom | manyray aster | Asteraceae
|
| SYAN3 | Symphyotrichum anticostense (Fern.) Nesom | Anticosti Island aster | Asteraceae
|
| SYAS3 | Symphyotrichum ascendens (Lindl.) Nesom | western aster | Asteraceae
|
| SYBA5 | Symphyotrichum bahamense (Britt.) Nesom | Bahaman aster | Asteraceae
|
| SYBA | Symphyotrichum �batesii (Rydb.) Nesom | | Asteraceae
|
| SYBO2 | Symphyotrichum boreale (Torr. & Gray) A.& D. L�ve | northern bog aster | Asteraceae
|
| SYBR | Symphyotrichum bracei (Britt. ex Small) Nesom | Brace's aster | Asteraceae
|
| SYBR2 | Symphyotrichum bracteolatum auct. non (Nutt.) Nesom p.p. | Symphyotrichum eatonii | Asteraceae
|
| SYCAB | Symphyotrichum campestre (Nutt.) Nesom var. bloomeri (Nutt.) Nesom | Bloomer's aster | Asteraceae
|
| SYCAC | Symphyotrichum campestre (Nutt.) Nesom var. campestre | western meadow aster | Asteraceae
|
| SYCA3 | Symphyotrichum campestre (Nutt.) Nesom | western meadow aster | Asteraceae
|
| SYCHC | Symphyotrichum chilense (Nees) Nesom var. chilense | Pacific aster | Asteraceae
|
| SYCHI | Symphyotrichum chilense (Nees) Nesom var. invenustum (Greene) Nesom | Pacific aster | Asteraceae
|
| SYCHM | Symphyotrichum chilense (Nees) Nesom var. medium (Jepson) Nesom | Pacific aster | Asteraceae
|
| SYCH4 | Symphyotrichum chilense (Nees) Nesom | Pacific aster | Asteraceae
|
| SYCI2 | Symphyotrichum ciliatum (Ledeb.) Nesom | rayless alkali aster | Asteraceae
|
| SYCIC | Symphyotrichum ciliolatum (Lindl.) A.& D. L�ve var. comatum (Fern.) Nesom | Symphyotrichum ciliolatum | Asteraceae
|
| SYCIM | Symphyotrichum ciliolatum (Lindl.) A.& D. L�ve var. maccallae (Rydb.) Nesom | Symphyotrichum ciliolatum | Asteraceae
|
| SYCIW | Symphyotrichum ciliolatum (Lindl.) A.& D. L�ve var. wilsonii (Rydb.) Nesom | Symphyotrichum ciliolatum | Asteraceae
|
| SYCI | Symphyotrichum ciliolatum (Lindl.) A.& D. L�ve | Lindley's aster | Asteraceae
|
| SYCO2 | Symphyotrichum �columbianum (Piper) Nesom | | Asteraceae
|
| SYCO3 | Symphyotrichum concolor (L.) Nesom | eastern silver aster | Asteraceae
|
| SYCOF | Symphyotrichum cordifolium (L.) Nesom var. furbishiae (Fern.) Nesom | Symphyotrichum cordifolium | Asteraceae
|
| SYCOL | Symphyotrichum cordifolium (L.) Nesom var. lanceolatum (Porter) Nesom | Symphyotrichum cordifolium | Asteraceae
|
| SYCOM | Symphyotrichum cordifolium (L.) Nesom var. moratum (Shinners) Nesom | Symphyotrichum cordifolium | Asteraceae
|
| SYCOP | Symphyotrichum cordifolium (L.) Nesom var. polycephalum (Porter) Nesom | Symphyotrichum cordifolium | Asteraceae
|
| SYCOR | Symphyotrichum cordifolium (L.) Nesom var. racemiflorum (Fern.) Nesom | Symphyotrichum cordifolium | Asteraceae
|
| SYCO4 | Symphyotrichum cordifolium (L.) Nesom | common blue wood aster | Asteraceae
|
| SYCR | Symphyotrichum crenifolium (Fern.) Nesom | Symphyotrichum novi-belgii var. crenifolium | Asteraceae
|
| SYCU2 | Symphyotrichum cusickii (Gray) Nesom | Cusick's aster | Asteraceae
|
| SYDE | Symphyotrichum defoliatum (Parish) Nesom | San Bernardino aster | Asteraceae
|
| SYDE2 | Symphyotrichum depauperatum (Fern.) Nesom | serpentine aster | Asteraceae
|
| SYDI2 | Symphyotrichum divaricatum (Nutt.) Nesom | southern annual saltmarsh aster | Asteraceae
|
| SYDRD | Symphyotrichum drummondii (Lindl.) Nesom var. drummondii | Drummond's aster | Asteraceae
|
| SYDRP | Symphyotrichum drummondii (Lindl.) Nesom var. parviceps (Shinners) Nesom | Symphyotrichum drummondii var. texanum | Asteraceae
|
| SYDRT | Symphyotrichum drummondii (Lindl.) Nesom var. texanum (Burgess) Nesom | Drummond's aster | Asteraceae
|
| SYDR | Symphyotrichum drummondii (Lindl.) Nesom | Drummond's aster | Asteraceae
|
| SYDUD | Symphyotrichum dumosum (L.) Nesom var. dodgei (Fern.) Nesom | Symphyotrichum dumosum var. strictior | Asteraceae
|
| SYDUD2 | Symphyotrichum dumosum (L.) Nesom var. dumosum | rice button aster | Asteraceae
|
| SYDUG | Symphyotrichum dumosum (L.) Nesom var. gracilipes (Wieg.) Nesom | rice button aster | Asteraceae
|
| SYDUP | Symphyotrichum dumosum (L.) Nesom var. pergracile (Wieg.) Nesom | rice button aster | Asteraceae
|
| SYDUS | Symphyotrichum dumosum (L.) Nesom var. strictior (Torr. & Gray) Nesom | rice button aster | Asteraceae
|
| SYDUS2 | Symphyotrichum dumosum (L.) Nesom var. subulifolium (Torr. & Gray) Nesom | rice button aster | Asteraceae
|
| SYDU2 | Symphyotrichum dumosum (L.) Nesom | rice button aster | Asteraceae
|
| SYEA2 | Symphyotrichum eatonii (Gray) Nesom | Eaton's aster | Asteraceae
|
| SYEL | Symphyotrichum elliotii (Torr. & Gray) Nesom | Elliott's aster | Asteraceae
|
| SYERE | Symphyotrichum ericoides (L.) Nesom var. ericoides | white heath aster | Asteraceae
|
| SYERP2 | Symphyotrichum ericoides (L.) Nesom var. pansum (Blake) Nesom | manyflowered aster | Asteraceae
|
| SYERP | Symphyotrichum ericoides (L.) Nesom var. prostratum (Kuntze) Nesom | white heath aster | Asteraceae
|
| SYERS | Symphyotrichum ericoides (L.) Nesom var. stricticaule (Torr. & Gray) Nesom | white heath aster | Asteraceae
|
| SYER | Symphyotrichum ericoides (L.) Nesom | white heath aster | Asteraceae
|
| SYEU | Symphyotrichum eulae (Shinners) Nesom | Texas aster | Asteraceae
|
| SYEX | Symphyotrichum expansum (Poepp. ex Spreng.) Nesom | southwestern annual saltmarsh aster | Asteraceae
|
| SYFAC | Symphyotrichum falcatum (Lindl.) Nesom var. commutatum (Torr. & Gray) Nesom | white prairie aster | Asteraceae
|
| SYFAC2 | Symphyotrichum falcatum (Lindl.) Nesom var. crassulum (Rydb.) Nesom | white prairie aster | Asteraceae
|
| SYFAF | Symphyotrichum falcatum (Lindl.) Nesom var. falcatum | white prairie aster | Asteraceae
|
| SYFA | Symphyotrichum falcatum (Lindl.) Nesom | white prairie aster | Asteraceae
|
| SYFE | Symphyotrichum fendleri (Gray) Nesom | Fendler's aster | Asteraceae
|
| SYFI4 | Symphyotrichum �finkii (Rydb.) Nesom | | Asteraceae
|
| SYFI5 | Symphyotrichum firmum (Nees) Nesom | Symphyotrichum puniceum var. puniceum | Asteraceae
|
| SYFOA | Symphyotrichum foliaceum (DC.) Nesom var. apricum (Gray) Nesom | alpine leafybract aster | Asteraceae
|
| SYFOC | Symphyotrichum foliaceum (DC.) Nesom var. canbyi (Gray) Nesom | Canby's aster | Asteraceae
|
| SYFOF | Symphyotrichum foliaceum (DC.) Nesom var. foliaceum | alpine leafybract aster | Asteraceae
|
| SYFOP | Symphyotrichum foliaceum (DC.) Nesom var. parryi (D.C. Eat.) Nesom | Parry's aster | Asteraceae
|
| SYFO2 | Symphyotrichum foliaceum (DC.) Nesom | alpine leafybract aster | Asteraceae
|
| SYFO3 | Symphyotrichum fontinale (Alexander) Nesom | Florida water aster | Asteraceae
|
| SYFR2 | Symphyotrichum frondosum (Nutt.) Nesom | short-rayed alkalai aster | Asteraceae
|
| SYGE | Symphyotrichum georgianum (Alexander) Nesom | Georgia aster | Asteraceae
|
| SYGR5 | Symphyotrichum grandiflorum (L.) Nesom | largeflower aster | Asteraceae
|
| SYGR6 | Symphyotrichum �gravesii (Burgess) Nesom | | Asteraceae
|
| SYGR7 | Symphyotrichum greatae (Parish) Nesom | Greata's aster | Asteraceae
|
| SYHA | Symphyotrichum hallii (Gray) Nesom | Hall's aster | Asteraceae
|
| SYHE5 | Symphyotrichum hendersonii (Fern.) Nesom | Lyall aster | Asteraceae
|
| SYHE2 | Symphyotrichum hesperium (Gray) A.& D. L�ve | Symphyotrichum lanceolatum ssp. hesperium var. hesperium | Asteraceae
|
| SYJE | Symphyotrichum jessicae (Piper) Nesom | Jessica's aster | Asteraceae
|
| SYKR | Symphyotrichum kralii Nesom | Kral's aster | Asteraceae
|
| SYLAC | Symphyotrichum laeve (L.) A.& D. L�ve var. concinnum (Willd.) Nesom | smooth blue aster | Asteraceae
|
| SYLAG | Symphyotrichum laeve (L.) A.& D. L�ve var. geyeri (Gray) Nesom | Geyer's aster | Asteraceae
|
| SYLAL3 | Symphyotrichum laeve (L.) A.& D. L�ve var. laeve | smooth blue aster | Asteraceae
|
| SYLAP | Symphyotrichum laeve (L.) A.& D. L�ve var. purpuratum (Nees) Nesom | smooth blue aster | Asteraceae
|
| SYLA3 | Symphyotrichum laeve (L.) A.& D. L�ve | smooth blue aster | Asteraceae
|