Almutaster pauciflorus (Nutt.) A.& D. Löve. Present in the CalFlora Database but treated as Aster pauciflorus Nutt. (California distribution map). Synonymy: Aster hydrophilus Greene ex Woot. & Standl., Aster pauciflorus Nutt.

Ampelaster carolinianus (Walt.) Nesom. Synonymy: Aster carolinianus Walt., Lasallea caroliniana (Walt.) Semple & L. Brouillet, Virgulus carolinianus (Walt.) Reveal & Keener

Aster alpinus L. - Alpine aster. Image available from the Vascular Plant Image Gallery.

var. vierhapperi (Onno) Cronq. Synonymy: Aster alpinus ssp. vierhapperi Onno

Aster tataricus L. f. - Tatarian aster.

Boltonia decurrens (Torr. & Gray) Wood - Clasping-leaf doll's-daisy. Listed by the U.S. FWS as threatened - the FWS local name is Decurrent false aster and the FWS range is: U.S.A. (IL, MO). FWS Listing information: volume 53 Federal Register 45861; November 14, 1988. This taxon listed by the Center For Plant Conservation. Synonymy: Boltonia asteroides var. decurrens (Torr. & Gray) Fern., Boltonia latisquama var. decurrens (Torr. & Gray) Fern. & Grisc.

Callistephus chinensis (L.) Nees - China-aster. Synonymy: Aster chinensis L.

Canadanthus modestus (Lindl.) Nesom. Synonymy: Aster major (Hook.) Porter, Aster modestus Lindl., Aster unalaschkensis var. major Hook., Weberaster modestus (Lindl.) A.& D. Löve

Chaetopappa ericoides (Torr.) Nesom - Rose-heath. Present in the Texas flora and known locally as: Babywhite-aster (Texas Distribution by vegetation zone). Present in the CalFlora Database (California distribution map). Synonymy: Aster arenosus (Heller) Blake, Aster hirtifolius Blake, Aster leucelene Blake, Inula ericoides Torr., Leucelene ericoides (Torr.) Greene

Chloracantha spinosa (Benth.) Nesom - Mexican-devilweed. Present in the Texas flora (treated as Leucosyris spinosa (Benth.) Greeneby Hatch et al, 1990) and known locally as: Devil-weed a., Mexican devil-weed, spiny aster (Some authors treat this taxon as a variety of Erigeron ortegae Blake. (Texas Distribution by vegetation zone). Synonymy: Aster spinosus Benth., Erigeron ortegae Blake, Leucosyris spinosa (Benth.) Greene

Chrysopsis floridana Small - Florida golden-aster. Listed by the U.S. FWS as endangered, the FWS local name is Florida golden aster and the FWS range is: U.S.A. (FL). FWS Listing information: volume 51 Federal Register 17977; May l6, 1986. This taxon listed by the Center For Plant Conservation. Synonymy: Chrysopsis mariana var. floridana (Small) Fern., Heterotheca floridana (Small) R.W. Long, Heterotheca mariana ssp. floridana (Small) Harms

Chrysopsis godfreyi Semple - Godfrey's golden-aster.

Chrysopsis gossypina (Michx.) Ell. - Cottony golden-aster.

ssp. cruiseana (Dress) Semple Synonymy: Chrysopsis cruiseana Dress, Heterotheca cruiseana (Dress) Harms

ssp. gossypina Synonymy: Chrysopsis arenicola Alexander ex Small, Chrysopsis decumbens Chapman, Chrysopsis longii Fern., Chrysopsis pilosa (Walt.) Britt., non Nutt., Chrysopsis trichophylla (Nutt.) Ell., Heterotheca gossypina (Michx.) Shinners, Heterotheca trichophylla (Nutt.) Shinners, Inula gossypina Michx.

ssp. hyssopifolia (Nutt.) Semple Synonymy: Chrysopsis gigantea Small, Chrysopsis hyssopifolia Nutt., Chrysopsis mixta Dress, Heterotheca hyssopifolia (Nutt.) R.W. Long, Heterotheca hyssopifolia var. gigantea (Small) Harms

Chrysopsis lanuginosa Small - Lynn haven golden-aster.

Chrysopsis latisquamea Pollard - Pineland golden-aster. Synonymy: Heterotheca latisquamea (Pollard) Harms

Chrysopsis linearifolia Semple - Narrow-leaf golden-aster.

ssp. dressii Semple

ssp. linearifolia

Chrysopsis mariana (L.) Ell. - Maryland golden-aster. Present in the Texas flora (treated as Heterotheca mariana (L.) Shinnersby Hatch et al, 1990) and known locally as: Maryland goldaster (Texas Distribution by vegetation zone). Synonymy: Chrysopsis mariana var. macradenia Fern., Heterotheca mariana (L.) Shinners, Inula mariana L.

Chrysopsis pilosa Nutt. - Soft golden-aster. Present in the Texas flora (treated as Heterotheca pilosa (Nutt.) Shinnersby Hatch et al, 1990) and known locally as: Soft goldaster (Texas Distribution by vegetation zone). Images available from the Vascular Plant Image Gallery. Synonymy: Bradburia pilosa (Nutt.) Semple, Chrysopsis nuttallii Britt., Heterotheca pilosa (Nutt.) Shinners

Chrysopsis scabrella Torr. & Gray - Coastal-plain golden-aster. Synonymy: Heterotheca scabrella (Torr. & Gray) Harms

Chrysopsis subulata Small - Scrubland golden-aster. Synonymy: Heterotheca hyssopifolia var. subulata (Small) R.W. Long, Heterotheca subulata (Small) Harms

Corethrogyne californica DC. - California sand-aster.

var. californica Present in the CalFlora Database but treated as Lessingia filaginifolia (Hook. & Arn.) M.A. Lane var. californica (DC.) M.A. Lane (California distribution map). Synonymy: Lessingia filaginifolia var. californica (DC.) M.A. Lane

var. lyonii Blake

var. obovata (Benth.) Kuntze Synonymy: Corethrogyne obovata Benth.

Corethrogyne filaginifolia (Hook. & Arn.) Nutt. - Common sand-aster.

var. bernardina (Abrams) Hall

var. filaginifolia Present in the CalFlora Database but treated as Lessingia filaginifolia (Hook. & Arn.) M.A. Lane (California distribution map). Synonymy: Corethrogyne tomentella (Hook. & Arn.) Torr. & Gray, Lessingia filaginifolia (Hook. & Arn.) M.A. Lane

var. glomerata Hall Synonymy: Corethrogyne filaginifolia var. brevicula (Greene) Canby

var. hamiltonensis Keck

var. incana (Nutt.) Canby Present in the CalFlora Database (California distribution map). Synonymy: Corethrogyne incana Nutt.

var. latifolia Hall Synonymy: Corethrogyne flagellaris Greene

var. linifolia Hall Present in the CalFlora Database (California distribution map). Synonymy: Corethrogyne linifolia (Hall) Ferris

var. peirsonii Canby

var. pinetorum I.M. Johnston

var. robusta Greene

var. sessilis (Greene) Canby Synonymy: Corethrogyne sessilis Greene

var. virgata (Benth.) Gray Synonymy: Corethrogyne filaginifolia var. rigida Gray, Corethrogyne floccosa Greene

var. viscidula (Greene) Keck Synonymy: Corethrogyne scabra Greene, Corethrogyne viscidula Greene

Corethrogyne leucophylla (Lindl.) Jepson - Branched sand-aster. Present in the CalFlora Database (California distribution map).

Doellingeria infirma (Michx.) Greene. Synonymy: Aster humilis Willd., Aster infirmus Michx., Aster umbellatus var. brevisquamis Fern., Doellingeria humilis (Willd.) Britt.

Doellingeria sericocarpoides Small. Synonymy: Aster sericocarpoides (Small) K. Schum., Aster umbellatus var. latifolius Gray, Doellingeria umbellata var. latifolia (Gray) House

Doellingeria umbellata (P. Mill.) Nees.

var. pubens (Gray) Britt. Synonymy: Aster pubentior Cronq., Aster umbellatus var. pubens Gray, Doellingeria umbellata ssp. pubens (Gray) A.& D. Löve

var. umbellata Synonymy: Aster umbellatus P. Mill.

Eastwoodia elegans Brandeg. - Yellow-aster. Present in the CalFlora Database (California distribution map).

Erigeron procumbens (Houst. ex P. Mill.) Nesom - Corpus christi fleabane. Present in the Texas flora and known locally as: Corpus Christi fleabane (Texas Distribution by vegetation zone). Synonymy: Aster procumbens Houst. ex P. Mill., Erigeron myrionactis Small, Erigeron repens Gray

Erigeron watsonii (Gray) Cronq. - Watson's fleabane. Synonymy: Aster watsonii Gray

Eucephalus breweri (Gray) Nesom. Present in the CalFlora Database but treated as Aster breweri (A. Gray) Semple (California distribution map). Photographs (2) from CalPhotos. Synonymy: Aster breweri (Gray) Semple, Chrysopsis breweri Gray, Chrysopsis breweri var. multibracteata Jepson, Chrysopsis gracilis Eastw., Chrysopsis wrightii Gray, Heterotheca breweri (Gray) Shinners

Eucephalus brickellioides (Greene) Nesom. Present in the CalFlora Database but treated as Aster brickellioides E. Greene (California distribution map). Synonymy: Aster brickellioides Greene

Eucephalus elegans Nutt.. Synonymy: Aster elegans (Nutt.) Torr. & Gray, non Willd., Aster perelegans A. Nels. & J.F. Macbr., Eucephalus perelegans (A. Nels. & J.F. Macbr.) W.A. Weber

Eucephalus engelmannii (D.C. Eat.) Greene. Present in the CalFlora Database but treated as Aster engelmannii (Eaton) A. Gray (California distribution map). Synonymy: Aster elegans var. engelmannii D.C. Eat., Aster engelmannii (D.C. Eat.) Gray

Eucephalus glabratus (Greene) Greene. Synonymy: Aster brickellioides var. glabratus Greene, Aster siskiyouensis A. Nels. & J.F. Macbr.

Eucephalus glaucescens (Gray) Greene. Synonymy: Aster engelmannii var. glaucescens Gray, Aster glaucescens (Gray) Blake

Eucephalus gormanii Piper. Synonymy: Aster gormanii (Piper) Blake

Eucephalus ledophyllus (Gray) Greene.

var. covillei (Greene) Nesom Synonymy: Aster covillei (Greene) Blake ex Peck, Aster ledophyllus var. covillei (Greene) Cronq., Eucephalus covillei Greene

var. ledophyllus Present in the CalFlora Database but treated as Aster ledophyllus (A. Gray) A. Gray (California distribution map). Synonymy: Aster engelmannii var. ledophyllus Gray, Aster ledophyllus (Gray) Gray

Eucephalus paucicapitatus (B.L. Robins.) Greene. Synonymy: Aster engelmannii var. paucicapitatus B.L. Robins., Aster paucicapitatus (B.L. Robins.) B.L. Robins.

Eucephalus tomentellus (Greene) Greene. Synonymy: Aster tomentellus (Greene) Frye & Rigg, non Hook., Sericocarpus tomentellus Greene

Eucephalus vialis Bradshaw. This taxon listed by the Center For Plant Conservation. Synonymy: Aster vialis (Bradshaw) Blake

Eurybia avita (Alexander) Nesom. Synonymy: Aster avitus Alexander

Eurybia chapmanii (Torr. & Gray) Nesom. Synonymy: Aster chapmanii Torr. & Gray

Eurybia chlorolepis (Burgess) Nesom. Synonymy: Aster chlorolepis Burgess, Aster divaricatus var. chlorolepis (Burgess) Ahles

Eurybia compacta Nesom. Synonymy: Aster gracilis Nutt.

Eurybia conspicua (Lindl.) Nesom. Synonymy: Aster conspicuus Lindl.

Eurybia divaricata (L.) Nesom. Synonymy: Aster boykinii Burgess, Aster carmesinus Burgess, Aster castaneus Burgess, Aster claytonii Burgess, Aster divaricatus L., Aster excavatus Burgess, Aster flexilis Burgess, Aster stilettiformis Burgess, Aster tenebrosus Burgess

Eurybia eryngiifolia (Torr. & Gray) Nesom. Synonymy: Aster eryngiifolius Torr. & Gray

Eurybia furcata (Burgess) Nesom. Synonymy: Aster furcatus Burgess

Eurybia glauca (Nutt.) Nesom. Synonymy: Aster glaucodes Blake, Aster glaucodes var. formosus (Greene) Kittell, Aster glaucus Torr. & Gray, non Nees, Eucephalus formosus Greene, Eucephalus glaucus Nutt.

Eurybia hemispherica (Alexander) Nesom. Present in the Texas flora and known locally as: Low aster (Texas Distribution by vegetation zone). Images available from the Vascular Plant Image Gallery. Synonymy: Aster gattingeri Alexander, non Kuntze, Aster hemisphericus Alexander, Aster paludosus ssp. hemisphericus (Alexander) Cronq., Aster pedionomus Alexander, Aster verutifolius Alexander, Heleastrum hemisphericum (Alexander) Shinners

Eurybia X herveyi (Gray) Nesom [macrophylla X spectabilis]. Synonymy: Aster commixtus auct. non (Nees) Kuntze, Aster X herveyi Gray (pro sp.), Eurybia commixta auct. non Nees

Eurybia horrida (Woot. & Standl.) Nesom. Synonymy: Aster horridus (Woot. & Standl.) Blake, Herrickia horrida Woot. & Standl.

Eurybia integrifolia (Nutt.) Nesom. Present in the CalFlora Database but treated as Aster integrifolius Nutt. (California distribution map). A photograph from CalPhotos. Synonymy: Aster integrifolius Nutt.

Eurybia jonesiae (Lamboy) Nesom. Synonymy: Aster jonesiae Lamboy

Eurybia macrophylla (L.) Cass.. Synonymy: Aster ianthinus Burgess, Aster macrophyllus L., Aster macrophyllus var. apricensis Burgess, Aster macrophyllus var. excelsior Burgess, Aster macrophyllus var. ianthinus (Burgess) Fern., Aster macrophyllus var. pinguifolius Burgess, Aster macrophyllus var. sejunctus Burgess, Aster macrophyllus var. velutinus Burgess, Aster multiformis Burgess, Aster nobilis Burgess, Aster riciniatus Burgess, Aster roscidus Burgess, Aster violaris Burgess

Eurybia merita (A. Nels.) Nesom. Synonymy: Aster behringensis Gandog., Aster meritus A. Nels., Aster richardsonii Spreng., Aster sibiricus ssp. richardsonii (Spreng.) A.& D. Löve, Aster sibiricus var. giganteus (Hook.) Gray, Aster sibiricus var. meritus (A. Nels.) Raup, Eurybia sibirica var. gigantea (Hook.) Nesom

Eurybia mirabilis (Torr. & Gray) Nesom. Synonymy: Aster mirabilis Torr. & Gray, Aster commixtus auct. non (Nees) Kuntze, Eurybia commixta auct. non Nees

Eurybia paludosa (Ait.) Nesom. Synonymy: Aster paludosus Ait.

Eurybia pulchra (Blake) Nesom. Synonymy: Aster glaucodes ssp. pulcher Blake, Aster glaucodes var. pulcher (Blake) Kearney & Peebles ex Welsh

Eurybia radula (Ait.) Nesom. Synonymy: Aster radula Ait., Aster radula var. strictus (Pursh) Gray, Aster strictus Pursh, non Poir.

Eurybia radulina (Gray) Nesom. Present in the CalFlora Database but treated as Aster radulinus A. Gray (California distribution map). Synonymy: Aster radulinus Gray, Aster eliasii A. Nels., Weberaster radulinus (Gray) A.& D. Löve

Eurybia saxicastellii (J.N. Campbell & M. Medley) Nesom. Synonymy: Aster saxicastellii J.N. Campbell & M. Medley

Eurybia schreberi (Nees) Nees. Synonymy: Aster chasei G.N. Jones, Aster curvescens Burgess, Aster glomeratus (Bernh. ex Nees) Burgess, Aster schreberi Nees, Eurybia glomerata Bernh. ex Nees

Eurybia sibirica (L.) Nesom. Synonymy: Aster sibiricus L.

Eurybia spectabilis (Ait.) Nesom. Synonymy: Aster spectabilis Ait., Aster spectabilis var. cinerascens Blake, Aster spectabilis var. suffultus Fern., Aster commixtus (Nees) Kuntze, Aster smallii Alexander, Eurybia commixta Nees

Eurybia spinulosa (Chapman) Nesom. Synonymy: Aster spinulosus Chapman

Eurybia surculosa (Michx.) Nesom. Synonymy: Aster surculosus Michx.

Eurybia wasatchensis (M.E. Jones) Nesom. Synonymy: Aster wasatchensis (M.E. Jones) Blake, Aster glaucus var. wasatchensis M.E. Jones

Hesperomannia arborescens Gray - Lanai island-aster. Listed by the U.S. FWS as endangered. The FWS range of distribution is: U.S.A. (HI). FWS Listing information: volume 59 Federal Register 14493; March 28, 1994. Synonymy: Hesperomannia arborescens var. bushiana (O. Deg.) Carlq., Hesperomannia arborescens var. swezeyi (O. Deg.) Carlq.

Hesperomannia arbuscula Hbd. - Maui island-aster. Listed by the U.S. FWS as endangered. The FWS range of distribution is: U.S.A. (HI). FWS Listing information: volume 56 Federal Register 55785; October 29, 1991. This taxon listed by the Center For Plant Conservation. Synonymy: Hesperomannia arbuscula ssp. oahuensis (Hbd.) Carlq., Hesperomannia arbuscula var. pearsallii St. John, Hesperomannia mauiensis St. John

Hesperomannia lydgatei Forbes - Kauai island-aster. Listed by the U.S. FWS as endangered. The FWS range of distribution is: U.S.A. (HI). FWS Listing information: volume 56 Federal Register 47699; September 20, 1991.

Heterotheca barbata (Rydb.) Semple - Spokane false golden-aster. Synonymy: Chrysopsis barbata Rydb.

Heterotheca camporum (Greene) Shinners - Lemon-yellow false golden-aster.

var. camporum Synonymy: Chrysopsis camporum Greene, Chrysopsis villosa var. camporum (Greene) Cronq., Heterotheca villosa var. camporum (Greene) Wunderlin

var. glandulissimum Semple Synonymy: Chrysopsis camporum var. glandulissimum (Semple) Cronq.

Heterotheca canescens (DC.) Shinners - Hoary false golden-aster. Present in the Texas flora and known locally as: Gray goldaster (Texas Distribution by vegetation zone). Synonymy: Chrysopsis berlandieri Greene, Chrysopsis canescens (DC.) Torr. & Gray, non DC., Chrysopsis villosa var. canescens (DC.) Gray

Heterotheca fulcrata (Greene) Shinners - Rocky-scree false golden-aster. Present in the Texas flora and known locally as: Rocky goldaster (Texas Distribution by vegetation zone).

var. amplifolia (Rydb.) Semple Synonymy: Chrysopsis amplifolia Rydb., Chrysopsis caudata Rydb., Chrysopsis nitidula Woot. & Standl.

var. arizonica Semple

var. fulcrata Synonymy: Chrysopsis cryptocephala Woot. & Standl., Chrysopsis fulcrata Greene, Chrysopsis resinolens A. Nels.

var. senilis (Woot. & Standl.) Semple Synonymy: Chrysopsis senilis Woot. & Standl.

Heterotheca jonesii (Blake) Welsh & Atwood - Jones' false golden-aster. Synonymy: Chrysopsis jonesii Blake

Heterotheca oregona (Nutt.) Shinners - Oregon false golden-aster. Present in the CalFlora Database (California distribution map).

var. compacta (Keck) Semple Present in the CalFlora Database (California distribution map). Synonymy: Chrysopsis oregona var. compacta Keck

var. oregona Present in the CalFlora Database (California distribution map). Synonymy: Ammodia oregona Nutt., Chrysopsis oregona (Nutt.) Gray

var. rudis (Greene) Semple Present in the CalFlora Database (California distribution map). Synonymy: Chrysopsis oregona var. rudis (Greene) Jepson

var. scaberrima (Gray) Semple Present in the CalFlora Database (California distribution map). Synonymy: Chrysopsis oregona var. scaberrima Gray

Heterotheca pumila (Greene) Semple - Alpine false golden-aster. Synonymy: Chrysopsis alpicola Rydb., Chrysopsis alpicola var. glomerata A. Nels., Chrysopsis cooperi A. Nels., Chrysopsis pumila Greene, Chrysopsis villosa var. glomerata (A. Nels.) Harms

Heterotheca rutteri (Rothrock) Shinners - Rutter's false golden-aster. Synonymy: Chrysopsis rutteri (Rothrock) Greene

Heterotheca sessiliflora (Nutt.) Shinners - Sessile-flower false golden-aster. Present in the CalFlora Database (California distribution map).

ssp. bolanderi (Gray) Semple Present in the CalFlora Database (California distribution map). Photographs (5) from CalPhotos. Synonymy: Chrysopsis bolanderi Gray, Chrysopsis villosa var. bolanderi (Gray) Gray ex Jepson, Heterotheca bolanderi (Gray) Harms

ssp. echioides (Benth.) Semple Present in the CalFlora Database (California distribution map).

var. bolanderioides Semple

var. camphorata (Eastw.) Semple Synonymy: Chrysopsis camphorata Eastw., Chrysopsis villosa var. camphorata (Eastw.) Jepson, Heterotheca camphorata (Eastw.) Semple

var. echioides (Benth.) Semple, comb. nov. ined. Synonymy: Chrysopsis californica Elmer, Chrysopsis echioides Benth., Chrysopsis villosa var. echioides (Benth.) Gray, Heterotheca echioides (Benth.) Shinners

ssp. fastigiata (Greene) Semple Present in the CalFlora Database (California distribution map).

var. fastigiata (Greene) Semple, comb. nov. ined. Synonymy: Chrysopsis fastigiata Greene, Chrysopsis villosa var. fastigiata (Greene) Hall, Heterotheca fastigiata (Greene) Harms

var. sanjacintensis Semple

ssp. sessiliflora Present in the CalFlora Database (California distribution map). More information available from the Rare Plants of San Diego County. Synonymy: Chrysopsis sessiliflora Nutt., Chrysopsis villosa var. sessiliflora (Nutt.) Gray

Heterotheca stenophylla (Gray) Shinners - Stiff-leaf false golden-aster. Present in the Texas flora and known locally as: Narrowleaf goldaster (Texas Distribution by vegetation zone).

var. angustifolia (Rydb.) Semple Synonymy: Chrysopsis angustifolia Rydb., Chrysopsis villosa var. angustifolia (Rydb.) Cronq., Heterotheca villosa var. angustifolia (Rydb.) Semple

var. stenophylla Synonymy: Chrysopsis hispida var. stenophylla Gray, Chrysopsis scabrifolia A. Nels., Chrysopsis stenophylla (Gray) Greene, Chrysopsis villosa var. stenophylla (Gray) Gray

Heterotheca villosa (Pursh) Shinners - Hairy false golden-aster. Present in the Texas flora, no local name. (Texas Distribution by vegetation zone). Present in the CalFlora Database (California distribution map).

var. ballardii (Rydb.) Semple Synonymy: Chrysopsis ballardii Rydb.

var. depressa (Rydb.) Semple Synonymy: Chrysopsis depressa Rydb., Heterotheca depressa (Rydb.) Dorn

var. foliosa (Nutt.) Harms Synonymy: Chrysopsis butleri Rydb., Chrysopsis foliosa (Nutt.) Shinners, Chrysopsis hirsutissima Greene, Chrysopsis imbricata A. Nels., Chrysopsis villosa var. foliosa (Nutt.) D.C. Eat.

var. minor (Hook.) Semple Present in the CalFlora Database but treated as Heterotheca villosa (Pursh) Shinn. var. hispida (Hook.) Harms (California distribution map). Synonymy: Chrysopsis arida A. Nels., Chrysopsis bakeri Greene, Chrysopsis columbiana Greene, Chrysopsis hispida (Hook.) DC., Chrysopsis villosa var. hispida (Hook.) Gray, Chrysopsis wisconsinensis Shinners, Heterotheca villosa var. hispida (Hook.) Harms, Heterotheca wisconsinensis (Shinners) Shinners

var. nana (Gray) Semple Present in the Texas flora (treated as Heterotheca horrida (Rydb.) Harmsby Hatch et al, 1990)No Texas distribution data available. Synonymy: Chrysopsis canescens var. nana Gray, Chrysopsis horrida Rydb., Heterotheca horrida (Rydb.) Harms, Heterotheca villosa var. horrida (Hook.) Semple

var. pedunculata (Greene) Harms ex Semple Synonymy: Chrysopsis pedunculata Greene

var. scabra (Eastw.) Semple Present in the CalFlora Database (California distribution map). Synonymy: Chrysopsis viscida ssp. cinerascens Blake, Heterotheca horrida ssp. cinerascens (Blake) Semple

var. sierrablancensis Semple

var. villosa Present in the CalFlora Database (California distribution map). Synonymy: Chrysopsis mollis Nutt., Chrysopsis villosa (Pursh) Nutt. ex DC.

Heterotheca viscida (Gray) Harms - Cliff false golden-aster. Present in the Texas flora, no local name. (Texas Distribution by vegetation zone). Synonymy: Chrysopsis villosa var. viscida Gray, Chrysopsis viscida (Gray) Greene

Heterotheca zionensis Semple - Zion false golden-aster.

Ionactis alpina (Nutt.) Greene. Present in the CalFlora Database but treated as Aster scopulorum A. Gray (California distribution map). Photographs (2) from CalPhotos. Synonymy: Aster scopulorum Gray, Chrysopsis alpina Nutt.

Ionactis linariifolius (L.) Greene. Present in the Texas flora (treated as Aster linariifolius L.by Hatch et al, 1990) and known locally as: Savoryleaf aster (Texas Distribution by vegetation zone). Synonymy: Aster linariifolius L., Aster linariifolius var. victorinii Fern.

Ionactis stenomeres (Gray) Greene. Synonymy: Aster stenomeres Gray

Machaeranthera bigelovii (Gray) Greene - Bigelow's tansy-aster.

var. bigelovii Synonymy: Aster aquifolius (Greene ex Woot. & Standl.) Blake, Aster bigelovii Gray, Aster pattersonii Gray, Aster rubrotinctus Blake, Machaeranthera aquifolia Greene ex Woot. & Standl., Machaeranthera centaureoides Greene ex Woot. & Standl., Machaeranthera pattersonii (Gray) Greene, Machaeranthera rubricaulis Rydb.

var. commixta (Greene) B.L. Turner Synonymy: Machaeranthera canescens var. commixta (Greene) Welsh, Machaeranthera commixta Greene

var. mucronata (Greene) B.L. Turner Synonymy: Aster adenolepis Blake, Machaeranthera mucronata Greene

Machaeranthera blephariphylla (Gray) Shinners - Texas tansy-aster. Present in the Texas flora, no local name. (Texas Distribution by vegetation zone). Synonymy: Aster gymnocephalus auct. non (DC.) Gray, Haplopappus blephariphyllus Gray, Machaeranthera correllii Shinners, Machaeranthera gymnocephala auct. non (DC.) Shinners

Machaeranthera canescens (Pursh) Gray - Hoary tansy-aster. Present in the CalFlora Database (California distribution map).

ssp. canescens

var. ambigua B.L. Turner Synonymy: Machaeranthera angustifolia Woot. & Standl., Machaeranthera oxylepis Greene, Machaeranthera scoparia Greene

var. canescens Synonymy: Aster canescens Pursh, Aster canescens var. viscosus (Nutt.) Gray, Aster glossophyllus Piper, Aster leiodes Blake, Aster shastensis var. glossophyllus (Piper) Cronq., Aster shastensis var. latifolius Cronq., Dieteria canescens Nutt., Dieteria divaricata Nutt., Dieteria pulverulenta Nutt., Dieteria viscosa Nutt., Machaeranthera angustifolia Rydb., non Woot. & Standl., Machaeranthera canescens var. latifolia (A. Nels.) Welsh, non Gray, Machaeranthera canescens var. monticola Dorn, Machaeranthera canescens var. viscosa (Nutt.) Piper, Machaeranthera divaricata (Nutt.) Greene, Machaeranthera glabella Greene ex Rydb., Machaeranthera laetevirens Greene, non Aster laetevirens (Greene) Greene, Machaeranthera latifolia A. Nels., Machaeranthera leptophylla Rydb., Machaeranthera linearis Rydb., non Greene, Machaeranthera montana Greene, Machaeranthera paniculata A. Nels., Machaeranthera pinosa Elmer, Machaeranthera pulverulenta (Nutt.) Greene, Machaeranthera ramosa A. Nels., Machaeranthera selbyi Rydb., Machaeranthera shastensis var. glossophylla (Piper) Cronq. & Keck, Machaeranthera shastensis var. latifolia (Cronq.) Cronq. & Keck, Machaeranthera shastensis var. montana (Greene) Cronq. & Keck, Machaeranthera spinulosa (Greene) Cory, non Amellus spinulosa Pursh, Machaeranthera subalpina Greene, Machaeranthera superba A. Nels., Machaeranthera viscosa (Nutt.) Greene

var. incana (Lindl.) Gray Synonymy: Aster attenuatus (T.J. Howell) M.E. Peck, non Lindl. ex Hook., Aster tephrodes (Gray) Blake, Dieteria incana (Lindl.) Torr. & Gray, Diplopappus incanus Lindl., Machaeranthera attenuata T.J. Howell, Machaeranthera canescens var. tephrodes Gray, Machaeranthera incana (Lindl.) Greene, Machaeranthera tephrodes (Gray) Greene

var. leucanthemifolia (Greene) Welsh Synonymy: Aster leucanthemifolius Greene, Machaeranthera hiemalis A. Nels., Machaeranthera leucanthemifolia (Greene) Greene

var. sessiliflora (Nutt.) B.L. Turner Synonymy: Dieteria sessiliflora (Nutt.) Greene, Machaeranthera magna A. Nels., Machaeranthera sessiliflora (Nutt.) Greene

var. shastensis (Gray) B.L. Turner Synonymy: Aster inornatus Greene, Aster shastensis (Gray) Gray, Aster shastensis var. eradiatus Gray, Machaeranthera eradiata (Gray) T.J. Howell, Machaeranthera inops A. Nels. & J.F. Macbr., Machaeranthera inops var. atrata A. Nels. & J.F. Macbr., Machaeranthera inornata (Greene) Greene, Machaeranthera shastensis Gray, Machaeranthera shastensis var. eradiata (Gray) Cronq. & Keck

var. ziegleri (Munz) B.L. Turner Synonymy: Machaeranthera canescens ssp. ziegleri Munz

ssp. glabra (Gray) B.L. Turner Present in the Texas flora, no local name. No Texas distribution data available.

var. aristata (Eastw.) B.L. Turner Synonymy: Aster canescens var. aristatus Eastw., Aster cichoriaceus (Greene) Blake, Machaeranthera canescens var. vacans (A. Nels.) Welsh, Machaeranthera cichoriacea Greene, Machaeranthera pulverulenta var. vacans A. Nels., Machaeranthera rigida Greene

var. glabra Gray Synonymy: Aster linearis (Greene) Cory, Machaeranthera canescens var. viridis Gray, Machaeranthera fremontii Rydb., Machaeranthera linearis Greene

var. nebraskana B.L. Turner

Machaeranthera carnosa (Gray) Nesom - Shrubby alkali tansy-aster. Present in the CalFlora Database (California distribution map).

var. carnosa Synonymy: Leucosyris carnosa (Gray) Greene, Linosyris carnosa Gray

var. intricata (Gray) Nesom Synonymy: Aster intricatus (Gray) Blake, Bigelovia intricata Gray, Leucosyris carnosa var. intricata (Gray) Cronq.

Machaeranthera coloradoensis (Gray) Osterhout - Colorado tansy-aster. More information available from the Wyoming Rare Plant Field Guide.

var. brandegeei (Rydb.) T.J. Wats. ex R.L. Hartman

var. coloradoensis Synonymy: Aster coloradoensis Gray, Eriocarpum coloradoense (Gray) Greene, Haplopappus coloradoensis (Gray) R.L. Hartman ex Dorn, Xylorhiza coloradoensis (Gray) Rydb.

Machaeranthera gracilis (Nutt.) Shinners - Grass-leaf tansy-aster. Present in the Texas flora (treated as Haplopappus gracilis (Nutt.) Grayby Hatch et al, 1990) (Texas Distribution by vegetation zone). Present in the CalFlora Database (California distribution map). Synonymy: Dieteria gracilis Nutt., non Aster gracilis Nutt., Haplopappus gracilis (Nutt.) Gray, Haplopappus ravenii R.C. Jackson, Sideranthus gracilis (Nutt.) A. Nels.

Machaeranthera grindelioides (Nutt.) Shinners - Rayless tansy-aster.

var. depressa (Maguire) Cronq. & Keck Synonymy: Haplopappus nuttallii var. depressus Maguire

var. grindelioides Synonymy: Eriocarpum grindelioides Nutt., Haplopappus nuttallii Torr. & Gray, Sideranthus grindelioides (Nutt.) Britt.

Machaeranthera gypsitherma Nesom, Vorobik & Hartman - La playa springs tansy-aster. Synonymy: Aster blepharophyllus Gray

Machaeranthera gypsophila B.L. Turner - Gypsum tansy-aster. Present in the Texas flora, no local name. No Texas distribution data available.

Machaeranthera juncea (Greene) Shinners - Rush tansy-aster. Present in the CalFlora Database (California distribution map). More information available from the Rare Plants of San Diego County. Synonymy: Haplopappus junceus Greene

Machaeranthera parviflora Gray - Small-flower tansy-aster. Present in the Texas flora, no local name. (Texas Distribution by vegetation zone). Synonymy: Aster parviflorus Gray, non Nees, Aster parvulus Blake, Machaeranthera pygmaea (Gray) Woot. & Standl.

Machaeranthera pinnatifida (Hook.) Shinners - Lacy tansy-aster.

ssp. gooddingii (A. Nels.) B.L. Turner & Hartman

var. gooddingii (A. Nels.) B.L. Turner & Hartman Synonymy: Haplopappus gooddingii (A. Nels.) Munz & Johnston, Haplopappus spinulosus var. gooddingii (A. Nels.) Blake, Sideranthus gooddingii A. Nels.

var. paradoxa B.L. Turner & Hartman Synonymy: Haplopappus spinulosus var. paradoxa (B.L. Turner & Hartman) Cronq.

ssp. pinnatifida

var. chihuahuana B.L. Turner & Hartman Present in the Texas flora (treated as Haplopappus spinulosus (Pursh) DC. var. chihuahuanus (B. Turner & Hartman) Gandhiby Hatch et al, 1990) (Texas Distribution by vegetation zone). Synonymy: Haplopappus spinulosus var. chihuahuanus (B.L. Turner & Hartman) Gandhi

var. glaberrima (Rydb.) B.L. Turner & Hartman Present in the Texas flora (treated as Haplopappus spinulosus (Pursh) DC. var. glaberrimus (Rydb.) Blakeby Hatch et al, 1990) (Texas Distribution by vegetation zone). Synonymy: Haplopappus spinulosus ssp. glaberrimus (Rydb.) Hall, Haplopappus spinulosus var. glaberrimus (Rydb.) Blake, Sideranthus glaberrimus Rydb., Sideranthus spinulosus var. glaberrimus (Rydb.) A. Nels.

var. pinnatifida Present in the Texas flora (treated as Haplopappus spinulosus (Pursh) DC. var. spinulosusby Hatch et al, 1990) and known locally as: (synonym continued) Machaeranthera pinnatifida var. scabrella (Greene) B. Turner & Hartman, M. texensis (R. Jackson) Shinners (Texas Distribution by vegetation zone). Synonymy: Amellus spinulosus Pursh, non Machaeranthera spinulosus Greene, Aster pinnatifidus (Hook.) Kuntze, Dieteria spinulosa (Pursh) Nutt., Diplopappus pinnatifidus Hook., Eriocarpum australe Greene, Eriocarpum spinulosum (Pursh) Greene, Eriocarpum wootonii Greene, Haplopappus coulteri Harvey & Gray ex Gray, Haplopappus spinulosus (Pursh) DC., Haplopappus spinulosus ssp. australis (Greene) Hall, Haplopappus spinulosus ssp. cotulus (Small) Hall, Haplopappus spinulosus ssp. laevis (Woot. & Standl.) Hall, Haplopappus spinulosus var. canescens Gray, Haplopappus spinulosus var. glaber Gray, Haplopappus spinulosus var. turbinellus (Rydb.) Blake, Haplopappus texensis R.C. Jackson, Machaeranthera australis (Greene) Shinners, Machaeranthera laevis (Woot. & Standl.) Shinners, Machaeranthera pinnata (Nutt.) Shinners, Machaeranthera texensis (R.C. Jackson) Shinners, Sideranthus australis (Greene) Rydb., Sideranthus cotula Small, Sideranthus laevis Woot. & Standl., Sideranthus machaerantherus Small, Sideranthus puberulus Rydb., Sideranthus spinulosus (Pursh) Sweet ex Rydb., Sideranthus turbinellus Rydb., Sideranthus wootonii (Greene) Standl., Starkea pinnata Nutt.

Machaeranthera riparia (Kunth) A.G. Jones - Chiricahua mountain tansy-aster. Synonymy: Aster riparius Kunth, Aster sonorae Gray, Machaeranthera sonorae (Gray) J. Stucky

Machaeranthera tagetina Greene - Mesa tansy-aster. Synonymy: Aster tagetinus (Greene) Blake

Machaeranthera tanacetifolia (Kunth) Nees - Takhoka-daisy. Present in the Texas flora and known locally as: Tansyleaf m., tahoka daisy (Texas Distribution by vegetation zone). Present in the CalFlora Database (California distribution map). Synonymy: Aster tanacetifolius Kunth, Machaeranthera coronopifolia (Nutt.) A. Nels., Machaeranthera parthenium Greene

Machaeranthera viscida (Woot. & Standl.) R.L. Hartman - Sticky tansy-aster. Present in the Texas flora (treated as Haplopappus havardii Waterf.by Hatch et al, 1990) (Texas Distribution by vegetation zone). Synonymy: Haplopappus havardii Waterfall, Machaeranthera havardii (Waterfall) Shinners

Oclemena acuminata (Michx.) Greene. Synonymy: Aster acuminatus Michx., Aster acuminatus var. magdalenensis Fern.

Oclemena X blakei (Porter) Nesom [acuminata X nemoralis]. Synonymy: Aster blakei (Porter) House

Oclemena nemoralis (Ait.) Greene. Synonymy: Aster nemoralis Ait.

Oclemena reticulata (Pursh) Nesom. Synonymy: Aster reticulatus Pursh, Doellingeria reticulata (Pursh) Greene

Oligoneuron album (Nutt.) Nesom. Synonymy: Aster ptarmicoides (Nees) Torr. & Gray, Aster ptarmicoides var. georgianus Gray, Doellingeria ptarmicoides Nees, Inula alba Nutt., Solidago ptarmicoides (Nees) Boivin, Unamia alba (Nutt.) Rydb.

Oligoneuron X lutescens (Lindl. ex DC.) Nesom [album X rigidum]. Synonymy: Aster lutescens (Lindl. ex DC.) Torr. & Gray, Aster ptarmicoides var. lutescens (Lindl. ex DC.) Gray, Diplopappus lutescens Lindl. ex DC., Solidago X lutescens (Lindl. ex DC.) Boivin, Unamia lutescens (Lindl. ex DC.) Rydb.

Oreostemma alpigenum (Torr. & Gray) Greene.

var. alpigenum Synonymy: Aster alpigenus (Torr. & Gray) Gray, Haplopappus alpigenus Torr. & Gray

var. andersonii (Gray) Nesom Present in the CalFlora Database but treated as Aster alpigenus (Torrey & A. Gray) A. Gray var. andersonii (A. Gray) M. Peck (California distribution map). Photographs (4) from CalPhotos. Synonymy: Aster alpigenus ssp. andersonii (Gray) Onno, Aster alpigenus var. andersonii (Gray) Onno ex M.E. Peck, Aster andersonii (Gray) Gray, Erigeron andersonii Gray

var. haydenii (Porter) Nesom Synonymy: Aster alpigenus ssp. haydenii (Porter) Cronq., Aster alpigenus var. haydenii (Porter) Cronq., Aster haydenii Porter

Oreostemma elatum (Greene) Greene. Synonymy: Aster elatus (Greene) Cronq., Oreastrum elatum Greene

Oreostemma peirsonii (C.W. Sharsmith) Nesom. Present in the CalFlora Database but treated as Aster peirsonii Sharsm. (California distribution map). Photographs (3) from CalPhotos. Synonymy: Aster peirsonii C.W. Sharsmith

Pityopsis ruthii (Small) Small - Ruth's silk-grass. Listed by the U.S. FWS as endangered, the FWS local name is Ruth's golden aster and the FWS range is: U.S.A. (TN). FWS Listing information: volume 50 Federal Register 29344; July 18, 1985. This taxon listed by the Center For Plant Conservation. Synonymy: Chrysopsis ruthii Small, Heterotheca ruthii (Small) Harms

Psilactis asteroides Gray. Present in the Texas flora (treated as Aster umbellatus Mill. var. latifolius Grayby Hatch et al, 1990) (Texas Distribution by vegetation zone). Present in the CalFlora Database but treated as Machaeranthera asteroides (Torrey) E. Greene (California distribution map). More information available from the Rare Plants of San Diego County. Synonymy: Aster amplifolius (Woot. & Standl.) Kittell, Aster boltoniae Greene, Aster canescens var. latifolius (Gray) Gray, Dieteria asteroides Torr., Machaeranthera amplifolia Woot. & Standl., Machaeranthera asteroides (Torr.) Greene, Machaeranthera asteroides var. glandulosa B.L. Turner, Machaeranthera asteroides var. lagunensis (Keck) B.L. Turner, Machaeranthera boltoniae (Greene) B.L. Turner & Horne, Machaeranthera canescens var. latifolia Gray, Machaeranthera hansonii A. Nels., Machaeranthera lagunensis Keck, Machaeranthera pruinosa Gray, Machaeranthera simplex Woot. & Standl., Machaeranthera verna A. Nels., Psilactis leptos Shinners

Sericocarpus asteroides (L.) B.S.P.. Synonymy: Aster asteroides (L.) MacMillan, Aster paternus Cronq., Conyza asteroides L.

Sericocarpus linifolius (L.) B.S.P.. Synonymy: Aster solidagineus Michx., Conyza linifolia L.

Sericocarpus oregonensis Nutt..

var. californicus (Dur.) Nesom Synonymy: Aster oregonensis ssp. californicus (Dur.) Keck, Sericocarpus californicus Dur., Sericocarpus oregonensis ssp. californicus (Dur.) Ferris

var. oregonensis Present in the CalFlora Database but treated as Aster oregonensis (Nutt.) Cronq. (California distribution map). Synonymy: Aster oregonensis (Nutt.) Cronq.

Sericocarpus rigidus Lindl.. Synonymy: Aster curtus Cronq.

Sericocarpus tortifolius (Michx.) Nees. Synonymy: Aster bifoliatus (Walt.) Ahles, Aster tortifolius Michx., Conyza bifoliata Walt., Sericocarpus acutisquamosus (Nash) Small, Sericocarpus bifoliatus (Walt.) Porter

Solidago gigantea Ait. - Late goldenrod. Present in the Texas flora and known locally as: Giant goldenrod (Texas Distribution by vegetation zone). Present in the CalFlora Database (California distribution map). Synonymy: Aster latissimifolius var. serotinus Kuntze, Solidago gigantea ssp. serotina (Kuntze) McNeill, Solidago gigantea var. leiophylla Fern., Solidago gigantea var. pitcheri (Nutt.) Shinners, Solidago gigantea var. serotina (Kuntze) Cronq., Solidago gigantea var. shinnersii Beaudry, Solidago X leiophallax Friesner, Solidago pitcheri Nutt., Solidago serotina Ait., non Retz., Solidago serotinoides A.& D. Löve

Stokesia laevis (Hill) Greene - Stokes'-aster. Synonymy: Carthamus laevis Hill

Symphyotrichum adnatum (Nutt.) Nesom. Synonymy: Aster adnatus Nutt., Lasallea adnata (Nutt.) Semple & L. Brouillet, Virgulus adnatus (Nutt.) Reveal & Keener

Symphyotrichum X amethystinum (Nutt.) Nesom [ericoides X novae-angliae]. Synonymy: Aster X amethystinus Nutt. (pro sp.), Lasallea X amethystina (Nutt.) Semple & L. Brouillet, Virgulus X amethystinus (Nutt.) Reveal & Keener

Symphyotrichum anomalum (Engelm.) Nesom. Synonymy: Aster anomalus Engelm.

Symphyotrichum anticostense (Fern.) Nesom. Synonymy: Aster anticostensis Fern.

Symphyotrichum ascendens (Lindl.) Nesom. Present in the CalFlora Database but treated as Aster ascendens Lindley (California distribution map). Photographs (2) from CalPhotos. Synonymy: Aster adscendens Lindl., Aster ascendens Lindl., Aster chilensis ssp. adscendens (Lindl.) Cronq., Aster macounii Rydb., Aster subgriseus Rydb., Virgulaster ascendens (Lindl.) Semple

Symphyotrichum bahamense (Britt.) Nesom. Synonymy: Aster subulatus var. elongatus Bosserd.

Symphyotrichum X batesii (Rydb.) Nesom [ericoides X oblongifolium]. Synonymy: Aster X batesii Rydb. (pro sp.)

Symphyotrichum boreale (Torr. & Gray) A.& D. Löve. Synonymy: Aster borealis (Torr. & Gray) Prov., Aster franklinianus Rydb., Aster junceus auct. non Ait., Aster junciformis Rydb., Aster laxifolius var. borealis Torr. & Gray

Symphyotrichum bracei (Britt. ex Small) Nesom. Synonymy: Aster bracei Britt. ex Small, Aster tenuifolius var. aphyllus R.W. Long

Symphyotrichum campestre (Nutt.) Nesom.

var. bloomeri (Nutt.) Nesom Synonymy: Aster bloomeri Gray, Aster campestris var. bloomeri (Gray) Gray

var. campestre Present in the CalFlora Database but treated as Aster campestris Nutt. (California distribution map). Synonymy: Aster campestris Nutt., Virgulus campestris (Nutt.) Reveal & Keener

Symphyotrichum chilense (Nees) Nesom.

var. chilense Present in the CalFlora Database but treated as Aster chilensis Nees (California distribution map). Photographs (6) from CalPhotos. Synonymy: Aster chilensis Nees

var. invenustum (Greene) Nesom Synonymy: Aster chilensis var. invenustus (Greene) Jepson, Aster invenustus Greene

var. medium (Jepson) Nesom Synonymy: Aster chilensis var. medius Jepson

Symphyotrichum ciliatum (Ledeb.) Nesom. Synonymy: Aster brachyactis Blake, Brachyactis angusta (Lindl.) Britt., Brachyactis ciliata (Ledeb.) Ledeb., Brachyactis ciliata ssp. angusta (Lindl.) A.G. Jones, Tripolium angustum Lindl.

Symphyotrichum ciliolatum (Lindl.) A.& D. Löve. Synonymy: Aster ciliolatus Lindl., Aster ciliolatus var. comatus (Fern.) A.G. Jones, Aster ciliolatus var. maccallae (Rydb.) A.G. Jones, Aster ciliolatus var. wilsonii (Rydb.) A.G. Jones, Aster foliaceus var. subgeminatus Fern., Aster lindleyanus Torr. & Gray, Aster maccallae Rydb., Aster saundersii Burgess, Aster subgeminatus (Fern.) Boivin, Aster wilsonii Rydb., Symphyotrichum ciliolatum var. comatum (Fern.) Nesom, Symphyotrichum ciliolatum var. maccallae (Rydb.) Nesom, Symphyotrichum ciliolatum var. wilsonii (Rydb.) Nesom, Symphyotrichum subgeminatum (Fern.) Nesom

Symphyotrichum X columbianum (Piper) Nesom [campestre X ericoides]. Synonymy: Aster X columbianus Piper (pro sp.)

Symphyotrichum concolor (L.) Nesom. Synonymy: Aster concolor L., Aster concolor var. simulatus (Small) R.W. Long, Aster plumosus Small, Aster simulatus Small, Lasallea concolor (L.) Semple & L. Brouillet, Virgulus concolor (L.) Reveal & Keener

Symphyotrichum cordifolium (L.) Nesom. Synonymy: Aster cordifolius L., Aster cordifolius ssp. sagittifolius (Wedemeyer ex Willd.) A.G. Jones, Aster cordifolius var. furbishiae Fern., Aster cordifolius var. incisus Britt., Aster cordifolius var. lanceolatus Porter, Aster cordifolius var. moratus (Shinners) Shinners, Aster cordifolius var. polycephalus Porter, Aster cordifolius var. racemiflorus Fern., Aster cordifolius var. sagittifolius (Wedemeyer ex Willd.) A.G. Jones, Aster finkii var. moratus Shinners, Aster lowrieanus var. incisus (Britt.) Porter, Aster lowrieanus var. lanceolatus Porter, Aster plumarius Burgess, Aster sagittifolius Wedemeyer ex Willd., Symphyotrichum cordifolium var. furbishiae (Fern.) Nesom, Symphyotrichum cordifolium var. lanceolatum (Porter) Nesom, Symphyotrichum cordifolium var. moratum (Shinners) Nesom, Symphyotrichum cordifolium var. polycephalum (Porter) Nesom, Symphyotrichum cordifolium var. racemiflorum (Fern.) Nesom, Symphyotrichum sagittifolium (Wedemeyer ex Willd.) Nesom

Symphyotrichum cusickii (Gray) Nesom. Synonymy: Aster cusickii Gray, Aster foliaceus var. cusickii (Gray) Cronq.

Symphyotrichum defoliatum (Parish) Nesom. Present in the CalFlora Database but treated as Aster bernardinus H.M. Hall (California distribution map). Synonymy: Aster defoliatus Parish, Aster bernardinus Hall, Aster deserticola J.F. Macbr., Virgulaster bernardinus (Hall) Semple

Symphyotrichum depauperatum (Fern.) Nesom. Synonymy: Aster depauperatus Fern., Aster ericoides var. pusillus Gray, Aster pilosus var. pusillus (Gray) A.G. Jones

Symphyotrichum divaricatum (Nutt.) Nesom. Present in the Texas flora, no local name. (Texas Distribution by vegetation zone). Present in the CalFlora Database but treated as Aster subulatus Michaux var. ligulatus Shinn. (California distribution map). Synonymy: Aster exilis Ell. nomen dubium (NOTE: Taxonomic placement not certain), Aster divaricatus (Nutt.) Torr. & Gray, non L., Aster neomexicanus Woot. & Standl., Aster subulatus var. ligulatus Shinners

Symphyotrichum drummondii (Lindl.) Nesom.

var. drummondii Synonymy: Aster drummondii Lindl., Aster sagittifolius var. drummondii (Lindl.) Shinners

var. texanum (Burgess) Nesom Present in the Texas flora (treated as Aster drummondii Lindl. ssp. parviceps (Shinners) A. Jonesby Hatch et al, 1990) (Texas Distribution by vegetation zone). Synonymy: Aster drummondii ssp. parviceps (Shinners) A.G. Jones, Aster drummondii ssp. texanus (Burgess) A.G. Jones, Aster drummondii var. parviceps (Shinners) A.G. Jones, Aster drummondii var. texanus (Burgess) A.G. Jones, Aster texanus Burgess, Aster texanus var. parviceps Shinners, Symphyotrichum drummondii var. parviceps (Shinners) Nesom

Symphyotrichum dumosum (L.) Nesom.

var. dumosum Present in the Texas flora and known locally as: Bushy aster (Texas Distribution by vegetation zone). Synonymy: Aster coridifolius Michx., Aster dumosus L., Aster dumosus var. coridifolius (Michx.) Torr. & Gray, Aster dumosus var. gracilentus Torr. & Gray

var. gracilipes (Wieg.) Nesom Synonymy: Aster dumosus var. gracilipes Wieg., Aster gracilipes (Wieg.) Alexander

var. pergracile (Wieg.) Nesom Synonymy: Aster dumosus var. pergracilis Wieg.

var. strictior (Torr. & Gray) Nesom Synonymy: Aster dumosus var. dodgei Fern., Aster dumosus var. strictior Torr. & Gray, Symphyotrichum dumosum var. dodgei (Fern.) Nesom

var. subulifolium (Torr. & Gray) Nesom Synonymy: Aster dumosus var. subulifolius Torr. & Gray

Symphyotrichum eatonii (Gray) Nesom. Present in the CalFlora Database but treated as Aster eatonii (A. Gray) Howell (California distribution map). Synonymy: Aster bracteolatus auct. non Nutt. p.p., Aster cordalenus Henderson, Aster eatonii (Gray) T.J. Howell, Aster foliaceus var. eatonii Gray, Aster mearnsii Rydb., Aster oregonus auct. non (Nutt.) Torr. & Gray, Symphyotrichum bracteolatum auct. non (Nutt.) Nesom p.p.

Symphyotrichum elliotii (Torr. & Gray) Nesom. Synonymy: Aster elliottii Torr. & Gray, Aster puniceus ssp. elliottii (Torr. & Gray) A.G. Jones, Aster puniceus var. elliottii (Torr. & Gray) A.G. Jones

Symphyotrichum ericoides (L.) Nesom. Images available from the Vascular Plant Image Gallery.

var. ericoides Present in the Texas flora and known locally as: Heath aster (Texas Distribution by vegetation zone). Synonymy: Aster ericoides L., Aster multiflorus Ait., Aster multiflorus var. exiguus Fern., Aster polycephalus Rydb., Lasallea ericoides (L.) Semple & L. Brouillet, Virgulus ericoides (L.) Reveal & Keener

var. pansum (Blake) Nesom Synonymy: Aster ericoides ssp. pansus (Blake) A.G. Jones, Aster ericoides var. pansus (Blake) Boivin, Aster multiflorus var. pansus Blake, Aster pansus (Blake) Cronq.

var. prostratum (Kuntze) Nesom Synonymy: Aster ericoides var. prostratus (Kuntze) Blake, Aster exiguus Rydb., Aster multiflorus var. prostratus Kuntze

var. stricticaule (Torr. & Gray) Nesom Synonymy: Aster ericoides var. stricticaulis (Torr. & Gray) F.C. Gates, Aster multiflorus var. stricticaulis Torr. & Gray, Aster stricticaulis (Torr. & Gray) Rydb.

Symphyotrichum eulae (Shinners) Nesom. Present in the Texas flora, no local name. (Texas Distribution by vegetation zone). Synonymy: Aster eulae Shinners

Symphyotrichum expansum (Poepp. ex Spreng.) Nesom. Synonymy: Aster inconspicuus Less., Aster subulatus var. cubensis (DC.) Shinners, Tripolium subulatum var. parviflorum Nees

Symphyotrichum falcatum (Lindl.) Nesom.

var. commutatum (Torr. & Gray) Nesom Present in the Texas flora (treated as Aster falcatus Lindl. ssp. commutatus (Gray) A. Jonesby Hatch et al, 1990) (Texas Distribution by vegetation zone). Synonymy: Aster commutatus (Torr. & Gray) Gray, Aster commutatus var. polycephalus Blake, non Aster polycephalus Rydb., Aster cordineri A. Nels., Aster ericoides var. commutatus (Torr. & Gray) Boivin p.p., Aster falcatus ssp. commutatus (Torr. & Gray) A.G. Jones, Aster falcatus var. commutatus (Torr. & Gray) A.G. Jones, Aster multiflorus var. commutatus Torr. & Gray, Aster nahanniensis Cody

var. crassulum (Rydb.) Nesom Synonymy: Aster adsurgens auct. non Greene, Aster commutatus var. crassulus (Rydb.) Blake, Aster crassulus Rydb., Aster falcatus var. crassulus (Rydb.) Cronq.

var. falcatum Synonymy: Aster elegantulus Porsild, Aster ericoides var. commutatus (Torr. & Gray) Boivin p.p., Aster falcatus Lindl., Aster ramulosus Lindl., Lasallea falcata (Lindl.) Semple & L. Brouillet, Virgulus falcatus (Lindl.) Reveal & Keener

Symphyotrichum fendleri (Gray) Nesom. Present in the Texas flora and known locally as: Fendler aster (Texas Distribution by vegetation zone). Synonymy: Virgulus fendleri (Gray) Reveal & Keener, Aster fendleri Gray

Symphyotrichum X finkii (Rydb.) Nesom [cordifolium X shortii]. Synonymy: Aster finkii Rydb.

Symphyotrichum foliaceum (DC.) Nesom.

var. apricum (Gray) Nesom Present in the CalFlora Database but treated as Aster foliaceus (Nutt.) Torrey & A. Gray var. apricus A. Gray (California distribution map). Synonymy: Aster apricus (Gray) Rydb., Aster foliaceus var. apricus Gray, Aster subspicatus var. apricus (Gray) Boivin

var. canbyi (Gray) Nesom Synonymy: Aster foliaceus var. canbyi Gray, Aster foliaceus var. burkei Gray, Aster phyllodes Rydb., Aster tweedyi Rydb.

var. foliaceum Synonymy: Aster foliaceus Lindl. ex DC., Aster foliaceus var. sublinearis D.C. Eat. & Grisc.

var. parryi (D.C. Eat.) Nesom Present in the CalFlora Database but treated as Aster foliaceus Lindley var. parryi (Eaton) A. Gray (California distribution map). Photographs (2) from CalPhotos. Synonymy: Aster ascendens var. parryi D.C. Eat., Aster diabolicus Piper, Aster foliaceus var. frondeus Gray, Aster foliaceus var. parryi (D.C. Eat.) Gray, Aster foliaceus var. subpetiolatus Fern., Aster frondeus (Gray) Greene

Symphyotrichum fontinale (Alexander) Nesom. Synonymy: Aster fontinalis Alexander, Aster patens var. floridanus R.W. Long

Symphyotrichum frondosum (Nutt.) Nesom. Present in the CalFlora Database but treated as Aster frondosus (Nutt.) Torrey & A. Gray (California distribution map). Synonymy: Aster frondosus (Nutt.) Torr. & Gray, Brachyactis frondosa (Nutt.) Gray, Tripolium frondosum Nutt.

Symphyotrichum georgianum (Alexander) Nesom. Synonymy: Aster georgianus Alexander, Aster patens var. georgianus (Alexander) Cronq., Virgulus georgianus (Alexander) Semple, Virgulus patens var. georgianus (Alexander) Reveal & Keener

Symphyotrichum grandiflorum (L.) Nesom. Synonymy: Aster grandiflorus L., Lasallea grandiflora (L.) Semple & L. Brouillet, Virgulus grandiflorus (L.) Reveal & Keener

Symphyotrichum X gravesii (Burgess) Nesom [dumosum X laeve]. Synonymy: Aster X gravesii Burgess (pro sp.)

Symphyotrichum greatae (Parish) Nesom. Present in the CalFlora Database but treated as Aster greatae Parish (California distribution map). Synonymy: Aster greatae Parish

Symphyotrichum hallii (Gray) Nesom. Synonymy: Aster chilensis ssp. hallii (Gray) Cronq., Aster hallii Gray

Symphyotrichum hendersonii (Fern.) Nesom. Present in the CalFlora Database but treated as Aster foliaceus Lindley var. lyallii (A. Gray) Cronq. (California distribution map). Photographs (3) from CalPhotos. Synonymy: Aster cusickii var. lyallii Gray, Aster foliaceus var. lyallii (Gray) Cronq., Aster hendersonii Fern.

Symphyotrichum jessicae (Piper) Nesom. Synonymy: Aster jessicae Piper

Symphyotrichum kralii Nesom ined.. Synonymy: Aster pinifolius Alexander, non Nees

Symphyotrichum laeve (L.) A.& D. Löve.

var. concinnum (Willd.) Nesom Synonymy: Aster concinnus Willd., Aster laevis var. concinnus (Willd.) House

var. geyeri (Gray) Nesom Present in the Texas flora (treated as Aster laevis L. var. guadalupensis A. Jonesby Hatch et al, 1990) (Texas Distribution by vegetation zone). Synonymy: Aster geyeri (Gray) T.J. Howell, Aster laevis var. geyeri Gray, Aster laevis var. guadalupensis A.G. Jones, Aster pickettianus Suksdorf

var. laeve Synonymy: Aster falcidens Burgess, Aster laevis L., Aster laevis var. falcatus Farw., Aster steeleorum Shinners

var. purpuratum (Nees) Nesom Synonymy: Aster attenuatus auct. non Lindl. ex Hook., Aster laevis var. purpuratus (Nees) A.G. Jones, Aster purpuratus Nees, Aster virgatus Ell., non Moench

Symphyotrichum lanceolatum (Willd.) Nesom.

ssp. hesperium (Gray) Nesom

var. hesperium (Gray) Nesom Present in the Texas flora and known locally as: Siskiyou aster (Texas Distribution by vegetation zone). Present in the CalFlora Database but treated as Aster lanceolatus Willd. ssp. hesperius (A. Gray) Semple & J. Chmielewski (California distribution map). Synonymy: Aster hesperius Gray, Aster hesperius var. laetevirens (Greene) Cronq., Aster hesperius var. wootonii Greene, Aster laetevirens Greene, Aster lanceolatus ssp. hesperius (Gray) Semple & Chmielewski, Aster osterhoutii Rydb., Aster wootonii (Greene) Greene, Symphyotrichum hesperium (Gray) A.& D. Löve

ssp. lanceolatum

var. hirsuticaule (Semple & Chmielewski) Nesom Synonymy: Aster lanceolatus var. hirsuticaulis Semple & Chmielewski

var. interior (Wieg.) Nesom Synonymy: Aster interior Wieg., Aster lanceolatus ssp. interior (Wieg.) A.G. Jones, Aster lanceolatus var. interior (Wieg.) A.G. Jones, Aster lanceolatus var. interior (Wieg.) Semple & Chmielewski, Aster simplex var. interior (Wieg.) Cronq.

var. lanceolatum Synonymy: Aster bellidiflorus Willd., Aster lamarckianus Nees, Aster lanceolatus Willd., Aster lanceolatus ssp. simplex (Willd.) A.G. Jones, Aster lanceolatus var. simplex (Willd.) A.G. Jones, Aster laxus Willd., Aster paniculatus Lam., p.p. non P. Mill., Aster paniculatus var. simplex (Willd.) Burgess, Aster simplex Willd., Aster simplex var. estuarinus Boivin, Aster simplex var. ramosissimus (Torr. & Gray) Cronq., Aster tenuifolius var. ramosissimus Torr. & Gray, Symphyotrichum simplex (Willd.) A.& D. Löve

var. latifolium (Semple & Chmielewski) Nesom Synonymy: Aster lanceolatus var. latifolius Semple & Chmielewski

Symphyotrichum lateriflorum (L.) A.& D. Löve.

var. angustifolium (Wieg.) Nesom Synonymy: Aster agrostifolius Burgess, Aster lateriflorus var. angustifolius Wieg.

var. flagellare (Shinners) Nesom Synonymy: Aster lateriflorus var. flagellaris Shinners, Aster lateriflorus var. indutus Shinners

var. hirsuticaule (DC.) Nesom Synonymy: Aster hirsuticaulis Lindl. ex DC., Aster lateriflorus var. hirsuticaulis (Lindl. ex DC.) Porter

var. horizontale (Desf.) Nesom Synonymy: Aster horizontalis Desf., Aster lateriflorus var. horizontalis (Desf.) Farw., Aster lateriflorus var. pendulus (Ait.) Burgess, Aster pendulus Ait.

var. lateriflorum Present in the Texas flora and known locally as: California aster (Texas Distribution by vegetation zone). Images available from the Vascular Plant Image Gallery. Synonymy: Aster lateriflorus (L.) Britt., Aster vimineus Lam., Solidago lateriflora L.

var. spatelliforme (Burgess) Nesom Synonymy: Aster lateriflorus var. spatelliformis (Burgess) A.G. Jones, Aster spatelliformis Burgess

Symphyotrichum lentum (Greene) Nesom. Present in the CalFlora Database but treated as Aster lentus E. Greene (California distribution map). Synonymy: Aster chilensis var. lentus (Greene) Jepson, Aster chilensis var. sonomensis (Greene) Jepson, Aster lentus Greene, Aster sonomensis Greene

Symphyotrichum X longulum (Sheldon) Nesom [boreale X puniceum]. Synonymy: Aster X longulus Sheldon (pro sp.)

Symphyotrichum lowrieanum (Porter) Nesom. See image/info page from the Wildflower Nirvana(treated as Aster lowrieanus). Synonymy: Aster cordifolius ssp. laevigatus (Porter) A.G. Jones, Aster cordifolius var. laevigatus Porter, Aster lowrieanus Porter

Symphyotrichum molle (Rydb.) Nesom. Synonymy: Aster mollis Rydb.

Symphyotrichum novae-angliae (L.) Nesom. Synonymy: Aster novae-angliae L., Lasallea novae-angliae (L.) Semple & L. Brouillet, Virgulus novae-angliae (L.) Reveal & Keener

Symphyotrichum novi-belgii (L.) Nesom.

var. crenifolium (Fern.) J. Labrecque & L. Brouillet Synonymy: Aster crenifolius (Fern.) Cronq., Aster crenifolius var. arcuans (Fern.) Cronq., Aster foliaceus auct. non Lindl. ex DC., Aster foliaceus var. arcuans Fern., Aster novi-belgii var. crenifolius (Fern.) J. Labrecque & L. Brouillet, Aster novi-belgii var. rosaceus Rouss., Aster rolandii Shinners, Symphyotrichum crenifolium (Fern.) Nesom

var. elodes (Torr. & Gray) Nesom Synonymy: Aster elodes Torr. & Gray, Aster novi-belgii var. elodes (Torr. & Gray) Gray

var. novi-belgii Synonymy: Aster eminens Willd., Aster junceus Ait., Aster longifolius Lam., Aster novi-belgii L., Aster salicifolius sensu Willd., non Lam. nec Ait., Symphyotrichum longifolium (Lam.) Nesom

var. villicaule (Gray) J. Labrecque & L. Brouillet Synonymy: Aster gaspensis Victorin, Aster johannensis Fern., Aster johannensis var. villicaulis (Gray) Fern., Aster longifolius var. villicaulis Gray, Aster novi-belgii var. villicaulis (Gray) Boivin, Aster tardiflorus var. vestitus Fern., Aster novi-belgii ssp. johannensis (Fern.) A.G. Jones, Aster novi-belgii var. johannensis (Fern.) A.G. Jones

Symphyotrichum oblongifolium (Nutt.) Nesom. Present in the Texas flora and known locally as: Aromatic aster (Texas Distribution by vegetation zone). Synonymy: Aster kumleinii Fries ex Gray, Aster oblongifolius Nutt., Aster oblongifolius var. angustatus Shinners, Aster oblongifolius var. orientis Shinners, Aster oblongifolius var. rigidulus Gray, Lasallea oblongifolia (Nutt.) Semple & L. Brouillet, Virgulus oblongifolius (Nutt.) Reveal & Keener

Symphyotrichum ontarione (Wieg.) Nesom. Synonymy: Aster diffusus var. thyrsoides Gray, Aster lateriflorus var. thyrsoides (Gray) Sheldon, Aster missouriensis Britt., non Kuntze, Aster missouriensis var. thyrsoides (Gray) Wieg., Aster ontarionis Wieg., Aster ontarionis var. glabratus Semple, Aster pantotrichus Blake, Aster pantotrichus var. thyrsoides (Gray) Blake, Aster tradescantii var. thyrsoides (Gray) Boivin, Symphyotrichum ontarione var. glabratum (Semple) L. Brouillet & Bouchard

Symphyotrichum oolentangiense (Riddell) Nesom.

var. oolentangiense Present in the Texas flora and known locally as: Azure aster (Texas Distribution by vegetation zone). Synonymy: Aster azureus Lindl., Aster oolentangiensis Riddell, Aster oolentangiensis var. laevicaulis (Fern.) A.G. Jones

var. poaceum (Burgess) Nesom Synonymy: Aster azureus var. poaceus (Burgess) Fern., Aster oolentangiensis var. poaceus (Burgess) A.G. Jones, Aster poaceus Burgess, Aster vernalis Engelm. ex Burgess

Symphyotrichum parviceps (Burgess) Nesom. Synonymy: Aster depauperatus var. parviceps (Burgess) Fern., Aster ericoides var. parviceps Burgess, Aster parviceps (Burgess) Mackenzie & Bush, Aster pilosus ssp. parviceps (Burgess) A.G. Jones

Symphyotrichum patens (Ait.) Nesom. Images available from the Vascular Plant Image Gallery.

var. gracile (Hook.) Nesom Present in the Texas flora, no local name. (Texas Distribution by vegetation zone). Synonymy: Aster patens var. gracilis Hook., Aster tenuicaulis (C. Mohr) Burgess, Virgulus patens var. gracilis (Hook.) Reveal & Keener

var. patens Synonymy: Aster patens Ait., Lasallea patens (Ait.) Semple & L. Brouillet, Virgulus patens (Ait.) Reveal & Keener

var. patentissimum (Lindl. ex DC.) Nesom Present in the Texas flora, no local name. (Texas Distribution by vegetation zone). Synonymy: Aster continuus Small, Aster patens var. patentissimus (Lindl. ex DC.) Torr. & Gray, Aster patentissimus Lindl. ex DC., Aster subsessilis Burgess, Virgulus patens var. patentissimus (Lindl. ex DC.) Reveal & Keener

Symphyotrichum phlogifolium (Muhl. ex Willd.) Nesom. Synonymy: Aster patens var. phlogifolius (Muhl. ex Willd.) Nees, Aster phlogifolius Muhl. ex Willd., Virgulus patens var. phlogifolius (Muhl. ex Willd.) Reveal & Keener

Symphyotrichum pilosum (Willd.) Nesom.

var. pilosum Synonymy: Aster ericoides var. platyphyllus Torr. & Gray, Aster ericoides var. villosus (Michx.) Torr. & Gray, Aster juniperinus Burgess, Aster pilosus Willd., Aster pilosus var. platyphyllus (Torr. & Gray) Blake, Aster ramosissimus auct. non P. Mill., Aster villosus Michx.

var. pringlei (Gray) Nesom Synonymy: Aster ericoides var. pringlei Gray, Aster faxonii Porter, Aster pilosus var. pringlei (Gray) Blake, Aster pilosus var. demotus Blake, Aster polyphyllus Willd., non Moench, Aster pringlei (Gray) Britt.

Symphyotrichum priceae (Britt.) Nesom. Synonymy: Aster kentuckiensis Britt., Aster pilosus var. priceae (Britt.) Cronq., Aster priceae Britt.

Symphyotrichum porteri (Gray) Nesom. Synonymy: Aster porteri Gray, Aster ericoides var. strictus Porter

Symphyotrichum potosinum (Gray) Nesom. Synonymy: Aster lemmonii Gray, Aster potosinus Gray

Symphyotrichum praealtum (Poir.) Nesom.

var. angustior (Wieg.) Nesom Synonymy: Aster praealtus var. angustior Wieg.

var. nebraskense (Britt.) Nesom Synonymy: Aster nebraskensis Britt., Aster praealtus var. nebraskensis (Britt.) Wieg.

var. praealtum Present in the Texas flora (treated as Aster praealtus Poir. var. texicola Wieg.by Hatch et al, 1990) (Texas Distribution by vegetation zone). Synonymy: Aster caerulescens DC., Aster novi-belgii var. litoreus Gray, Aster praealtus Poir., Aster praealtus var. caerulescens (DC.) A.G. Jones, Aster praealtus var. imbricatior Wieg., Aster praealtus var. texicola Wieg., Aster salicifolius Ait., non Lam., Symphyotrichum novi-belgii var. litoreum (Gray) Nesom, Symphyotrichum praealtum var. texicola (Wieg.) Nesom

var. subasperum (Lindl.) Nesom Synonymy: Aster praealtus var. subasper (Lindl.) Wieg., Aster subasper Lindl.

Symphyotrichum pratense (Raf.) Nesom. Present in the Texas flora, no local name. (Texas Distribution by vegetation zone). Synonymy: Aster phyllolepis Torr. & Gray, Aster pratensis Raf., Aster sericeus var. microphyllus DC., Lasallea sericea ssp. pratensis (Raf.) Semple & L. Brouillet, Virgulus pratensis (Raf.) Reveal & Keener

Symphyotrichum prenanthoides (Muhl. ex Willd.) Nesom. Synonymy: Aster prenanthoides Muhl. ex Willd.

Symphyotrichum puniceum (L.) A.& D. Löve.

var. puniceum Synonymy: Aster calderi Boivin, Aster conduplicatus Burgess, Aster firmus Nees, Aster forwoodii S. Wats., Aster lucidulus (Gray) Wieg., Aster puniceus L., Aster puniceus ssp. firmus (Nees) A.G. Jones, Aster puniceus var. calderi (Boivin) Lepage, Aster puniceus var. calvus Shinners, Aster puniceus var. compactus Fern., Aster puniceus var. demissus Lindl., Aster puniceus var. firmus (Nees) Torr. & Gray, Aster puniceus var. lucidulus Gray, Aster puniceus var. oligocephalus Fern., Aster puniceus var. perlongus Fern., Symphyotrichum firmum (Nees) Nesom, Symphyotrichum puniceum var. calderi (Boivin) Nesom

var. scabricaule (Shinners) Nesom Present in the Texas flora and known locally as: Roughstem aster (Texas Distribution by vegetation zone). Synonymy: Aster puniceus var. scabricaulis (Shinners) A.G. Jones, Aster scabricaulis Shinners

Symphyotrichum racemosum (Ell.) Nesom. Synonymy: Aster brachypholis Small (NOTE: Taxonomic placement not certain), Aster fragilis auct. non Willd. (NOTE: Taxonomic placement not certain), Aster fragilis var. brachypholis (Small) A.G. Jones (NOTE: Taxonomic placement not certain), Aster fragilis var. subdumosus (Wieg.) A.G. Jones (NOTE: Taxonomic placement not certain), Aster racemosus Ell., Aster vimineus auct. non Lam. (NOTE: Taxonomic placement not certain), Aster vimineus var. subdumosus Wieg. (NOTE: Taxonomic placement not certain), Symphyotrichum racemosum var. subdumosum (Wieg.) Nesom (NOTE: Taxonomic placement not certain)

Symphyotrichum retroflexum (Lindl. ex DC.) Nesom. Synonymy: Aster curtisii Torr. & Gray, Aster retroflexus Lindl. ex DC.

Symphyotrichum robynsianum (Rouss.) L. Brouillet & Labrecque. Synonymy: Aster longifolius sensu Semple & Heard, non Lam., Aster robynsianus Rouss., Symphyotrichum longifolium sensu Nesom, non Lam.

Symphyotrichum X salignum (Willd.) Nesom [lanceolatum X novi-belgii]. Synonymy: Aster X salignus Willd.

Symphyotrichum X schistosum (Steele) Nesom [cordifolium X laeve]. Synonymy: Aster X schistosus Steele (pro sp.)

Symphyotrichum sericeum (Vent.) Nesom. Synonymy: Aster sericeus Vent., Lasallea sericea (Vent.) Greene, Virgulus sericeus (Vent.) Reveal & Keener

Symphyotrichum shortii (Lindl.) Nesom. Synonymy: Aster camptosorus Small, Aster shortii Lindl.

Symphyotrichum simmondsii (Small) Nesom. Synonymy: Aster simmondsii Small, Aster sulznerae Small

Symphyotrichum spathulatum (Lindl.) Nesom.

var. intermedium (Gray) Nesom Synonymy: Aster occidentalis var. intermedius Gray

var. spathulatum Present in the CalFlora Database but treated as Aster occidentalis (Nutt.) Torrey & A. Gray (California distribution map). Photographs (4) from CalPhotos. Synonymy: Aster ascendens var. fremontii Torr. & Gray, Aster delectabilis Hall, Aster fremontii (Torr. & Gray) Gray, Aster fremontii var. parishii Gray, Aster occidentalis (Nutt.) Torr. & Gray, Aster occidentalis var. delectabilis (Hall) Ferris, Aster occidentalis var. fremontii (Torr. & Gray) A.G. Jones, Aster occidentalis var. parishii (Gray) Ferris, Aster spathulatus Lindl., Symphyotrichum spathulatum var. fremontii (Torr. & Gray) Nesom, Tripolium occidentale Nutt.

var. yosemitanum (Gray) Nesom Present in the CalFlora Database but treated as Aster occidentalis (Nutt.) Torrey & A. Gray var. yosemitanus (A. Gray) Cronq. (California distribution map). Photographs (2) from CalPhotos. Synonymy: Aster ascendens var. yosemitanus Gray, Aster occidentalis var. yosemitanus (Gray) Cronq., Aster paludicola Piper, Aster yosemitanus (Gray) Greene

Symphyotrichum squamatum (Spreng.) Nesom. Present in the Texas flora and known locally as: Saltmarsh aster (Texas Distribution by vegetation zone). Synonymy: Aster divaricatus var. sandwicensis Gray, Aster exilis var. australis Gray, Aster sandwicensis (Gray) Hieron., Aster squamatus (Spreng.) Hieron., Aster subulatus var. australis (Gray) Shinners, Aster subulatus var. sandwicensis (Gray) A.G. Jones

Symphyotrichum subspicatum (Nees) Nesom.

var. grayi (Suksdorf) Nesom Synonymy: Aster grayi Suksdorf, Aster subspicatus var. grayi (Suksdorf) Cronq.

var. subspicatum Synonymy: Aster douglasii Lindl., Aster oregonum (Nutt.) Torr. & Gray, Aster subspicatus Nees, Tripolium oregonum Nutt.

Symphyotrichum subulatum (Michx.) Nesom. Present in the Texas flora and known locally as: Hierba del marrano No Texas distribution data available. Synonymy: Aster subulatus Michx., Aster subulatus var. euroauster Fern. & Grisc., Aster subulatus var. obtusifolius Fern.

Symphyotrichum X tardiflorum [cordifolium X puniceum]. Synonymy: Aster novi-belgii ssp. tardiflorus (L.) A.G. Jones, Aster novi-belgii var. tardiflorus (L.) A.G. Jones, Aster tardiflorus L., Symphyotrichum novi-belgii var. tardiflorum (L.) Nesom

Symphyotrichum tenuifolium (L.) Nesom. Present in the Texas flora and known locally as: Saline aster (Texas Distribution by vegetation zone). Synonymy: Aster tenuifolius L.

Symphyotrichum tradescantii (L.) Nesom. Synonymy: Aster saxatilis (Fern.) Blanch. nom. illeg., Aster tradescantii L., Aster tradescantii var. saxatilis (Fern.) House, Aster vimineus var. saxatilis Fern.

Symphyotrichum turbinellum (Lindl.) Nesom. Synonymy: Aster turbinellus Lindl.

Symphyotrichum undulatum (L.) Nesom. Synonymy: Aster asperifolius Burgess, Aster claviger Burgess, Aster corrigiatus Burgess, Aster diversifolius Michx., Aster gracilescens Burgess, Aster linguiformis Burgess, Aster loriformis (Burgess) Burgess, Aster mohrii Burgess, Aster proteus Burgess, Aster sylvestris Burgess, Aster triangularis (Burgess) Burgess, Aster truellius Burgess, Aster undulatus L., Aster undulatus var. asperulus Wood, Aster undulatus var. diversifolius (Michx.) Gray, Aster undulatus var. loriformis Burgess, Aster undulatus var. triangularis Burgess

Symphyotrichum urophyllum (Lindl.) Nesom. Synonymy: Aster hirtellus Lindl., Aster sagittifolius auct. non Wedemeyer ex Willd., Aster sagittifolius var. urophyllus (Lindl.) Burgess, Aster urophyllus Lindl.

Symphyotrichum X versicolor (Willd.) Nesom [laeve X novi-belgii]. Synonymy: Aster X versicolor Willd. (pro sp.)

Symphyotrichum walteri (Alexander) Nesom. Synonymy: Aster squarrosus sensu Walt., non All., Aster walteri Alexander, Lasallea walteri (Alexander) Semple & L. Brouillet, Virgulus walteri (Alexander) Reveal & Keener

Symphyotrichum welshii (Cronq.) Nesom. Synonymy: Aster welshii Cronq.

Symphyotrichum X woldenii (Rydb.) Nesom [laeve X praealtum]. Synonymy: Aster X woldenii Rydb. (pro sp.)

Symphyotrichum yukonense (Cronq.) Nesom. Synonymy: Aster yukonensis Cronq., Virgulus yukonensis (Cronq.) Reveal & Keener

Tetramolopium tenerrimum (Less.) Nees - Oahu tetramolopium. Synonymy: Aster tenerrimus Less.

Tonestus kingii (D.C. Eat.) Nesom.

var. barnebyana (Welsh & Goodrich) Nesom Synonymy: Aster kingii var. barnebyana (Welsh & Goodrich) Welsh, Machaeranthera kingii var. barnebyana Welsh & Goodrich

var. kingii Synonymy: Aster kingii D.C. Eat., Machaeranthera kingii (D.C. Eat.) Cronq. & Keck

Townsendia exscapa (Richards.) Porter - Stemless townsend-daisy. Present in the Texas flora and known locally as: Stemless townsendia (Texas Distribution by vegetation zone). Synonymy: Aster exscapus Richards., Townsendia intermedia Rydb., Townsendia sericea Hook.

Tripolium pannonicum (Jacq.) Dobrocz.. Synonymy: Aster tripolium L.

Xylorhiza cognata (Hall) T.J. Wats. - Mecca woody-aster. Present in the CalFlora Database (California distribution map). Synonymy: Aster cognatus Hall, Aster standleyi A. Davids., Machaeranthera cognata (Hall) Cronq. & Keck, Xylorhiza standleyi (A. Davids.) A. Davids.

Xylorhiza confertifolia (Cronq.) T.J. Wats. - Henrieville woody-aster. Synonymy: Machaeranthera confertifolia (Cronq.) Cronq., Machaeranthera glabriuscula var. confertifolia Cronq.

Xylorhiza cronquistii Welsh & Atwood - Cronquist's woody-aster. Synonymy: Machaeranthera cronquistii (Welsh & Atwood) Cronq.

Xylorhiza glabriuscula Nutt. - Smooth woody-aster.

var. glabriuscula Synonymy: Aster glabriuscula (Nutt.) Torr. & Gray, Aster glabriuscula var. parryi (Gray) Onno, Aster parryi Gray, Aster xylorhiza (Nutt.) Torr. & Gray, Machaeranthera glabriuscula (Nutt.) Cronq. & Keck

var. linearifolia T.J. Wats. Synonymy: Machaeranthera linearifolia (T.J. Wats.) Cronq.

var. villosa (Nutt.) A. Nels. Synonymy: Machaeranthera glabriuscula var. villosa (Nutt.) Cronq. & Keck, Xylorhiza villosa Nutt.

Xylorhiza orcuttii (Vasey & Rose) Greene - Orcutt's woody-aster. Present in the CalFlora Database (California distribution map). More information available from the Rare Plants of San Diego County. Synonymy: Aster orcuttii Vasey & Rose, Machaeranthera orcuttii (Vasey & Rose) Cronq. & Keck

Xylorhiza tortifolia (Torr. & Gray) Greene - Mojave woody-aster.

var. imberbis (Cronq.) T.J. Wats. Synonymy: Machaeranthera tortifolia var. imberbis Cronq.

var. tortifolia Present in the CalFlora Database (California distribution map). Photographs (9) from CalPhotos. Synonymy: Aplopappus tortifolius Torr. & Gray, Aster abatus Blake, Aster goodingii Onno, Aster mohavensis Coville, non Kuntze, Aster tortifolius (Torr. & Gray) Gray, non Michx., Machaeranthera tortifolia (Torr. & Gray) Cronq. & Keck, Xylorhiza lanceolata Rydb., Xylorhiza scopulorum A. Nels.

Xylorhiza venusta (M.E. Jones) Heller - Charming woody-aster. Synonymy: Aster venustus M.E. Jones, Machaeranthera venusta (M.E. Jones) Cronq. & Keck

Xylorhiza wrightii (Gray) Greene - Big bend woody-aster. Present in the Texas flora, no local name. (Texas Distribution by vegetation zone). Synonymy: Aster wrightii Gray, Machaeranthera wrightii (Gray) Cronq. & Keck, Townsendia wrightii (Gray) Gray

Xylothamia palmeri (Gray) Nesom - Texas desert-goldenrod. Present in the Texas flora (treated as Ericameria austrotenana M.C. Johnst.by Hatch et al, 1990) (Texas Distribution by vegetation zone). Synonymy: Aster palmeri Gray, non Ericameria palmeri (Gray) Hall, Ericameria austrotexana M.C. Johnston, Isocoma palmeri (Gray) Shinners