Trillium erectumL.

red trillium

WFO wfo-0000751087 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Trillium erectum, photographed by Mason Heberling
fig. a Mason Heberling, CC BY 4.0 / 2022-06-09 / obs. 204620821
Trillium erectum, photographed by Jason Hill
fig. b Jason Hill, CC BY 4.0 / obs. 203984514
Trillium erectum, photographed by Steven Lamonde
fig. c Steven Lamonde, CC BY 4.0 / obs. 202457166
Trillium erectum, photographed by Laura Gaudette
fig. d Laura Gaudette, CC BY 4.0 / obs. 201923498
Trillium erectum, photographed by Steven Lamonde
fig. e Steven Lamonde, CC BY 4.0 / obs. 205767099
Trillium erectum, photographed by Ian Whyte
fig. f Ian Whyte, CC0 1.0 / obs. 201083993
Trillium erectum, photographed by CatherineK
fig. g CatherineK, CC BY-SA 4.0 / obs. 203275726
Trillium erectum, photographed by David Eberly
fig. h David Eberly, CC0 1.0 / obs. 199953881

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 = 17,064 observations

Peak flowering in May, from 17,064 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 36 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 acuminatum Raf.
  • Trillium album (Michx.) Small
  • Trillium atropurpureum Raf.
  • Trillium atropurpureum M.A.Curtis ex L.C.Beck
  • Trillium erectum f. albiflorum R.Hoffm.
  • Trillium erectum f. brevipedicellatum Louis-Marie
  • Trillium erectum f. cahnae (Farw.) Louis-Marie
  • Trillium erectum f. erectum
  • Trillium erectum f. luteum Louis-Marie
  • Trillium erectum f. nigrescens Louis-Marie
  • Trillium erectum f. pallidandrum Vict. & J.Rousseau
  • Trillium erectum f. parviflorum Louis-Marie
  • Trillium erectum f. parvum Louis-Marie
  • Trillium erectum f. polymerum Vict.
  • Trillium erectum f. rubrostriatum Louis-Marie
  • Trillium erectum f. sessiloides B.Boivin
  • Trillium erectum f. viridiflorum (Curtis) Peattie
  • Trillium erectum subsp. rubrum Clute
  • Trillium erectum var. atropurpureum (Michx.) Pursh
  • Trillium erectum var. blandum Jennison
  • Trillium erectum var. cahnae Farw.
  • Trillium erectum var. declinatum A.Gray
  • Trillium erectum var. flavum Torr.
  • Trillium erectum var. giganteum Louis-Marie

and 12 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.