Caltha leptosepalaDC.

white marsh marigold

WFO wfo-0000581628 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Caltha leptosepala, photographed by F Quiec
fig. a F Quiec, CC BY-SA 4.0 / 2022-06-11 / obs. 205681979
Caltha leptosepala, photographed by J Straka
fig. b J Straka, CC BY 4.0 / obs. 154258158
Caltha leptosepala, photographed by Julia Carr
fig. c Julia Carr, CC0 1.0 / obs. 157785298
Caltha leptosepala, photographed by J Straka
fig. d J Straka, CC BY 4.0 / obs. 151884728
Caltha leptosepala, photographed by Diego Blanco
fig. e Diego Blanco, CC0 1.0 / obs. 148692641
Caltha leptosepala, photographed by J Straka
fig. f J Straka, CC BY 4.0 / obs. 149961508
Caltha leptosepala, photographed by Drew Meyer
fig. g Drew Meyer, CC0 1.0 / obs. 145758072
Caltha leptosepala, photographed by John Brew
fig. h John Brew, CC BY 4.0 / obs. 147029328

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.

Flowering n = 422 observations

Peak flowering in Jul, from 422 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.

  • Caltha auriculata (Raf.) Merr.
  • Caltha biflora var. howellii Huth
  • Caltha biflora var. rotundifolia (Huth) C.L.Hitchc.
  • Caltha chelidonii Greene
  • Caltha lasopetala Steud.
  • Caltha leptosepala f. chionophila Cockerell
  • Caltha leptosepala var. leptosepala
  • Caltha leptosepala var. macounii (Greene) K.C.Davis
  • Caltha leptosepala var. rotundifolia Huth
  • Caltha leptosepala var. sulfurea C.L.Hitchc.
  • Caltha leptostachya G.Don
  • Caltha macounii Greene
  • Caltha malvacea Greene
  • Caltha rotundifolia (Huth) Greene
  • Caltha uniflora Rydb.
  • Psychrophila leptosepala (DC.) W.A.Weber

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.