Erythronium americanumKer Gawl.

yellow trout lily

WFO wfo-0000766896 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Erythronium americanum, photographed by Pierre Cartier
fig. a Pierre Cartier, CC0 1.0 / 2022-06-09 / obs. 204762563
Erythronium americanum, photographed by Mary E. Macaulay, P.Eng.
fig. b Mary E. Macaulay, P.Eng., CC BY 4.0 / obs. 200602059
Erythronium americanum, photographed by Jason Hill
fig. c Jason Hill, CC BY 4.0 / obs. 203984560
Erythronium americanum, photographed by Mary E. Macaulay, P.Eng.
fig. d Mary E. Macaulay, P.Eng., CC BY 4.0 / obs. 200613094
Erythronium americanum, photographed by Mary E. Macaulay, P.Eng.
fig. e Mary E. Macaulay, P.Eng., CC BY 4.0 / obs. 200618788
Erythronium americanum, photographed by Mary E. Macaulay, P.Eng.
fig. f Mary E. Macaulay, P.Eng., CC BY 4.0 / obs. 200617802
Erythronium americanum, photographed by Howard Williams
fig. g Howard Williams, CC BY-SA 4.0 / obs. 200078649
Erythronium americanum, photographed by Mary E. Macaulay, P.Eng.
fig. h Mary E. Macaulay, P.Eng., CC BY 4.0 / obs. 200609084

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 = 16,845 observations

Peak flowering in Apr, from 16,845 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 16 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.

  • Erythronium americanum f. americanum
  • Erythronium americanum f. bachii (Farw.) Dole
  • Erythronium americanum f. castaneum L.B.Sm.
  • Erythronium americanum f. nuttallianum (Schult. & Schult.f.) Voss
  • Erythronium americanum f. oswaldi Moldenke
  • Erythronium americanum var. bachii Farw.
  • Erythronium americanum var. rubrum Farw.
  • Erythronium angustatum Raf.
  • Erythronium aquatile Salisb.
  • Erythronium aureum Loisel.
  • Erythronium bracteatum Bigelow
  • Erythronium flavescens Loisel.
  • Erythronium flavum Sm.
  • Erythronium harperi W.Wolf
  • Erythronium lanceolatum Pursh
  • Erythronium nuttallianum Schult. & Schult.f.

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.