Trillium cernuumL.

nodding trillium

WFO wfo-0000750770 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Trillium cernuum, photographed by Pierre Cartier
fig. a Pierre Cartier, CC0 1.0 / 2022-06-03 / obs. 203190648
Trillium cernuum, photographed by Pierre Cartier
fig. b Pierre Cartier, CC0 1.0 / obs. 203194681
Trillium cernuum, photographed by Derek
fig. c Derek, CC BY 4.0 / obs. 203701634
Trillium cernuum, photographed by Pierre Cartier
fig. d Pierre Cartier, CC0 1.0 / obs. 203195140
Trillium cernuum, photographed by Derek
fig. e Derek, CC BY 4.0 / obs. 202591780
Trillium cernuum, photographed by Todd Boland
fig. f Todd Boland, CC BY 4.0 / obs. 205232131
Trillium cernuum, photographed by Tom Scavo
fig. g Tom Scavo, CC BY 4.0 / obs. 202651695
Trillium cernuum, photographed by Mary E. Macaulay, P.Eng.
fig. h Mary E. Macaulay, P.Eng., CC BY 4.0 / obs. 202574641

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 = 1,971 observations

Peak flowering in May, from 1,971 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 17 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 cernuum f. billingtonii Farw.
  • Trillium cernuum f. cernuum
  • Trillium cernuum f. lalondei Cay. & J.Cay.
  • Trillium cernuum f. marginatum Cay. & J.Cay.
  • Trillium cernuum f. tangerae Wherry
  • Trillium cernuum f. viride Cay. & J.Cay.
  • Trillium cernuum f. walpolei Farw.
  • Trillium cernuum var. cernuum
  • Trillium cernuum var. declinatum Farw.
  • Trillium cernuum var. macranthum Eames & Wiegand
  • Trillium cernuum var. terrae-novae B.Boivin
  • Trillium cernuum var. typicum Wherry
  • Trillium flexipes f. walpolei (Farw.) Fernald
  • Trillium glaucum Raf.
  • Trillium hamosum Raf.
  • Trillium latifolium Raf.
  • Trillium medium Raf.

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.