Xanthisma spinulosum(Pursh) D.R.Morgan & R.L.Hartm.

lacy tansyaster

WFO wfo-0000036538 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Xanthisma spinulosum, photographed by Catherine C. Galley
fig. a Catherine C. Galley, CC BY 4.0 / 2022-06-04 / obs. 204304253
Xanthisma spinulosum, photographed by Catherine C. Galley
fig. b Catherine C. Galley, CC BY 4.0 / obs. 197666876
Xanthisma spinulosum, photographed by Craig Martin
fig. c Craig Martin, CC0 1.0 / obs. 190191756
Xanthisma spinulosum, photographed by Elliott Gordon
fig. d Elliott Gordon, CC BY 4.0 / obs. 189482175
Xanthisma spinulosum, photographed by Catherine C. Galley
fig. e Catherine C. Galley, CC BY 4.0 / obs. 173955316
Xanthisma spinulosum, photographed by Catherine C. Galley
fig. f Catherine C. Galley, CC BY 4.0 / obs. 171720107
Xanthisma spinulosum, photographed by Bobby McCabe
fig. g Bobby McCabe, CC BY 4.0 / obs. 162115708
Xanthisma spinulosum, photographed by Elliott Gordon
fig. h Elliott Gordon, CC BY 4.0 / obs. 166467955

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 22 botanical countries

Regions where Xanthisma spinulosum is native: Alberta, Arizona, California, Colorado, Idaho, Iowa, Kansas, Manitoba, Mexico Northeast, Mexico Northwest, Mexico Southwest, Minnesota, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Saskatchewan, Texas, Utah, Wyoming AlbertaArizonaCaliforniaColoradoIdahoIowaKansasManitobaMexico NortheastMexico NorthwestMexico SouthwestMinnesotaMontanaNebraskaNevadaNew MexicoNorth DakotaOklahomaSaskatchewanTexasUtahWyoming
Native distribution of Xanthisma spinulosum, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.
RegionTDWG codeContinent
Alberta ABT NORTHERN AMERICA
Arizona ARI
California CAL
Colorado COL
Idaho IDA
Iowa IOW
Kansas KAN
Manitoba MAN
Mexico Northeast MXE
Mexico Northwest MXN
Mexico Southwest MXS
Minnesota MIN
Montana MNT
Nebraska NEB
Nevada NEV
New Mexico NWM
North Dakota NDA
Oklahoma OKL
Saskatchewan SAS
Texas TEX
Utah UTA
Wyoming WYO

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Flowering 406 in flower of 450 examined

Peak flowering in Oct. Each bar is the share of Xanthisma spinulosum observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 406 of 450 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Also published as 53 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Amellus spinulosus Pursh
  • Aster pinnatifidus (Hook.) Kuntze
  • Chrysopsis lamarckii Nutt.
  • Dieteria spinulosa (Pursh) Nutt.
  • Diplopappus pinnatifidus Hook.
  • Eriocarpum australe Greene
  • Eriocarpum spinulosum Greene
  • Eriocarpum wootonii Greene
  • Haplopappus coulteri Harv. & Gray ex A.Gray
  • Haplopappus gooddingii (A.Nelson) Munz & I.M.Johnst.
  • Haplopappus spinulosus (Pursh) DC.
  • Haplopappus spinulosus subsp. australis H.M.Hall
  • Haplopappus spinulosus subsp. cotula H.M.Hall
  • Haplopappus spinulosus subsp. glaberrimus (Rydb.) H.M.Hall
  • Haplopappus spinulosus subsp. goodingii H.M.Hall
  • Haplopappus spinulosus subsp. spinulosus
  • Haplopappus spinulosus var. canescens A.Gray
  • Haplopappus spinulosus var. chihuahuanus (B.L.Turner & R.L.Hartm.) Gandhi
  • Haplopappus spinulosus var. glaber A.Gray
  • Haplopappus spinulosus var. glaberrimus (Rydb.) S.F.Blake
  • Haplopappus spinulosus var. gooddingii (A.Nelson) S.F.Blake
  • Haplopappus spinulosus var. spinulosus
  • Haplopappus texensis R.C.Jacks.
  • Machaeranthera australis (Greene) Shinners

and 29 more.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. USDA PLANTS Database. common name, checklist symbol MAPI. public domain. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.