Trillium chloropetalum(Torr.) Howell

giant wakerobin

WFO wfo-0000750189 Accepted WFO 2026-06 7 photographs CC0 / CC BY

Plate 1 figs. a–g

Trillium chloropetalum, photographed by joergmlpts
fig. a joergmlpts, CC BY 4.0 / 2022-04-25 / obs. 190746707
Trillium chloropetalum, photographed by Jeremiah Degenhardt
fig. b Jeremiah Degenhardt, CC BY 4.0 / obs. 184847148
Trillium chloropetalum, photographed by Ingo Renner
fig. c Ingo Renner, CC0 1.0 / obs. 188158755
Trillium chloropetalum, photographed by Chuck Wilson
fig. d Chuck Wilson, CC0 1.0 / obs. 185471112
Trillium chloropetalum, photographed by Cricket Raspet
fig. e Cricket Raspet, CC BY 4.0 / obs. 183959440
Trillium chloropetalum, photographed by Mike Heine
fig. f Mike Heine, CC BY 4.0 / obs. 183643930
Trillium chloropetalum, photographed by Andrew Lie
fig. g Andrew Lie, CC BY 4.0 / obs. 183446598

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.

Flowering n = 3,350 observations

Peak flowering in Mar, from 3,350 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 8 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.

  • Trillium chloropetalum subsp. giganteum (Hook. & Arn.) A.E.Murray
  • Trillium giganteum (Hook. & Arn.) A.Heller
  • Trillium giganteum var. chloropetalum (Torr.) R.R.Gates
  • Trillium sessile f. californicum (S.Watson) Farrer
  • Trillium sessile subsp. giganteum (Hook. & Arn.) A.E.Murray
  • Trillium sessile var. californicum S.Watson
  • Trillium sessile var. chloropetalum Torr.
  • Trillium sessile var. giganteum Hook. & Arn.

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.