Stylophorum diphyllum(Michx.) Nutt.

Celandine Poppy

WFO wfo-0001090305 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Stylophorum diphyllum, photographed by Jeff Clark
fig. a Jeff Clark, CC BY 4.0 / 2022-06-12 / obs. 205626209
Stylophorum diphyllum, photographed by Marilynn Miller
fig. b Marilynn Miller, CC BY 4.0 / obs. 199856192
Stylophorum diphyllum, photographed by Craig Martin
fig. c Craig Martin, CC0 1.0 / obs. 194556299
Stylophorum diphyllum, photographed by Joseph Rucker
fig. d Joseph Rucker, CC BY 4.0 / obs. 192442372
Stylophorum diphyllum, photographed by Bryant Brumbill-Corral
fig. e Bryant Brumbill-Corral, CC BY 4.0 / obs. 198460799
Stylophorum diphyllum, photographed by Ava
fig. f Ava, CC0 1.0 / obs. 201670135
Stylophorum diphyllum, photographed by nancyellivc
fig. g nancyellivc, CC BY 4.0 / obs. 192033094
Stylophorum diphyllum, photographed by Navin Sasikumar
fig. h Navin Sasikumar, CC BY 4.0 / obs. 194713176

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 = 2,758 observations

Peak flowering in Apr, from 2,758 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 6 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.

  • Chelidonium diphyllum Michx.
  • Chelidonium petiolatum Spreng. ex Steud.
  • Meconopsis diphylla (Michx.) DC.
  • Meconopsis petiolata DC.
  • Stylophorum ohiense Spreng.
  • Stylophorum petiolatum Nutt.

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.