Trillium angustipetalum (narrowpetal wakerobin)

Plate 1 figs. a–h · 8 separate observations

Trillium angustipetalum, photographed by Michael Warner — fig. a Michael Warner, CC BY 4.0 / 2021-06-09 / obs. 135790642

Trillium angustipetalum, photographed by Kyle Nessen — fig. b Kyle Nessen, CC0 1.0 / obs. 64894005

Trillium angustipetalum, photographed by Catie Clune — fig. c Catie Clune, CC BY 4.0 / obs. 17675359

Trillium angustipetalum, photographed by Gail A Baker — fig. d Gail A Baker, CC BY 4.0 / obs. 194863239

Trillium angustipetalum, photographed by Justin — fig. e Justin, CC BY 4.0 / obs. 128905839

Trillium angustipetalum, photographed by Adam J. Searcy — fig. f Adam J. Searcy, CC BY 4.0 / obs. 187074741

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 1 botanical country

Native distribution of Trillium angustipetalum, 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.

Region	TDWG code	Continent
California	CAL	NORTHERN AMERICA

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 3 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 var. angustipetalum (Torr.) Munz
Trillium giganteum var. angustipetalum (Torr.) R.R.Gates
Trillium sessile var. angustipetalum Torr.

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
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.