Erysimum capitatumGreene

Western Wallflower

WFO wfo-0000678546 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Erysimum capitatum, photographed by Bob Walker
fig. a Bob Walker, CC BY 4.0 / 2022-06-04 / obs. 203533002
Erysimum capitatum, photographed by Henrik Kibak
fig. b Henrik Kibak, CC BY 4.0 / obs. 202374926
Erysimum capitatum, photographed by Shalana Gray
fig. c Shalana Gray, CC BY 4.0 / obs. 201719940
Erysimum capitatum, photographed by Arvel Hernandez
fig. d Arvel Hernandez, CC BY 4.0 / obs. 201362775
Erysimum capitatum, photographed by James C. Davis
fig. e James C. Davis, CC BY-SA 4.0 / obs. 199820608
Erysimum capitatum, photographed by Alaina Krakowiak
fig. f Alaina Krakowiak, CC BY 4.0 / obs. 197701419
Erysimum capitatum, photographed by Jared Shorma
fig. g Jared Shorma, CC BY 4.0 / obs. 196617356
Erysimum capitatum, photographed by Henrik Kibak
fig. h Henrik Kibak, CC BY 4.0 / obs. 201376707

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.

Confused withby our own model

These are not lookalikes we guessed at. Each one is a species our identification model genuinely mistook for this plant, and how many times. The error rate is published.

Flowering n = 2,919 observations

Peak flowering in May, from 2,919 community-annotated observations worldwide. This is a global aggregate, not a forecast for your garden: the same species flowers on different dates in different hemispheres, and citizen-science records cluster near cities, at weekends, and in spring. Where a species has fewer than 30 annotated records we do not draw this chart at all.

Also published as 82 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.

  • Cheiranthus alpestris (Cockerell) A.Heller
  • Cheiranthus angustatus Greene
  • Cheiranthus argillosus Greene
  • Cheiranthus aridus A.Nelson
  • Cheiranthus aridus Greene
  • Cheiranthus arkansanus (Nutt.) Greene
  • Cheiranthus asperrimus Greene
  • Cheiranthus bakeri Greene
  • Cheiranthus californicus (Greene) Greene
  • Cheiranthus capitatus Douglas
  • Cheiranthus elatus (Nutt.) Greene
  • Cheiranthus nivalis Greene
  • Cheiranthus nivalis var. amoenus Greene
  • Cheiranthus oblanceolatus (Rydb.) A.Heller
  • Cheiranthus pacificus E.Sheld.
  • Cheiranthus radicatus (Rydb.) A.Heller
  • Cheiranthus wheeleri (Rothr.) Greene
  • Cheirinia amoena Rydb.
  • Cheirinia argillosa (Greene) Rydb.
  • Cheirinia arida (A.Nelson) Rydb.
  • Cheirinia arkansana (Nutt.) Moldenke
  • Cheirinia asperrima Rydb.
  • Cheirinia bakeri (Greene) Rydb.
  • Cheirinia brachycarpa Rydb.

and 58 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.

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