Xanthisma junceum(Greene) D.R.Morgan & R.L.Hartm.

rush bristleweed

WFO wfo-0000122969 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Xanthisma junceum, photographed by Madeleine Claire
fig. a Madeleine Claire, CC BY 4.0 / 2021-10-14 / obs. 163560191
Xanthisma junceum, photographed by Madeleine Claire
fig. b Madeleine Claire, CC BY 4.0 / obs. 163559190
Xanthisma junceum, photographed by Jim Riley
fig. c Jim Riley, CC0 1.0 / obs. 117697582
Xanthisma junceum, photographed by Sula Vanderplank
fig. d Sula Vanderplank, CC BY 4.0 / obs. 172641394
Xanthisma junceum, photographed by Sula Vanderplank
fig. e Sula Vanderplank, CC BY 4.0 / obs. 151531419
Xanthisma junceum, photographed by Sula Vanderplank
fig. f Sula Vanderplank, CC BY 4.0 / obs. 127635884
Xanthisma junceum, photographed by Jim Riley
fig. g Jim Riley, CC0 1.0 / obs. 117700985
Xanthisma junceum, photographed by Madeleine Claire
fig. h Madeleine Claire, CC BY 4.0 / obs. 163559152

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 2 botanical countries

Regions where Xanthisma junceum is native: California, Mexico Northwest CaliforniaMexico Northwest
Native distribution of Xanthisma junceum, 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
California CAL NORTHERN AMERICA
Mexico Northwest MXN

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.

Also published as 4 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.

  • Eriocarpum junceum (Greene) Greene
  • Haplopappus junceus Greene
  • Machaeranthera juncea (Greene) Shinners
  • Sideranthus junceus (Greene) Davidson & Moxley

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 MAJU. 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.