Senecio riddelliiTorr. & A.Gray

Riddell groundselRiddell's ragwort

WFO wfo-0000028441 Accepted WFO 2026-06 7 photographs CC0 / CC BY

Plate 1 figs. a–g · 4 observations

This species has been photographed under an open licence only 4 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.

Senecio riddellii, photographed by Sam Kieschnick
fig. a Sam Kieschnick, CC BY 4.0 / 2017-09-26 / obs. 12574454
Senecio riddellii, photographed by Sam Kieschnick
fig. b Sam Kieschnick, CC BY 4.0 / obs. 12574391
Senecio riddellii, photographed by Craig Martin
fig. c Craig Martin, CC0 1.0 / obs. 52169122
Senecio riddellii, photographed by Sam Kieschnick
fig. d Sam Kieschnick, CC BY 4.0 / obs. 12574395
Senecio riddellii, photographed by Sam Kieschnick
fig. e Sam Kieschnick, CC BY 4.0 / obs. 12574397
Senecio riddellii, photographed by Michelle W. （鍾偉瑋）
fig. f Michelle W. （鍾偉瑋）, CC BY 4.0 / obs. 176620021
Senecio riddellii, photographed by Craig Martin
fig. g Craig Martin, CC0 1.0 / obs. 52169334

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 10 botanical countries

Regions where Senecio riddellii is native: Arizona, Colorado, Kansas, Mexico Northeast, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, Wyoming ArizonaColoradoKansasMexico NortheastNebraskaNew MexicoOklahomaSouth DakotaTexasWyoming
Native distribution of Senecio riddellii, 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
Arizona ARI NORTHERN AMERICA
Colorado COL
Kansas KAN
Mexico Northeast MXE
Nebraska NEB
New Mexico NWM
Oklahoma OKL
South Dakota SDA
Texas TEX
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.

Also published as 7 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.

  • Senecio filifolius var. fremontii Torr. & A.Gray
  • Senecio fremontii (Torr. & A.Gray) Rydb.
  • Senecio riddellii var. parksii Cory
  • Senecio riddellii var. riddellii
  • Senecio spartioides var. fremontii (Torr. & A.Gray) Greenm.
  • Senecio spartioides var. parksii (Cory) Shinners
  • Senecio spartioides var. riddellii (Torr. & A.Gray) Greenm.

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. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. 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.