Cypripedium reginaeWalter

showy lady's slipper

WFO wfo-0000935633 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Cypripedium reginae, photographed by Mary Krieger
fig. a Mary Krieger, CC BY 4.0 / 2021-09-04 / obs. 156679199
Cypripedium reginae, photographed by Mary Krieger
fig. b Mary Krieger, CC BY 4.0 / obs. 140389837
Cypripedium reginae, photographed by Mary Krieger
fig. c Mary Krieger, CC BY 4.0 / obs. 156247248
Cypripedium reginae, photographed by Carol Ann Vermeer
fig. d Carol Ann Vermeer, CC BY 4.0 / obs. 140280859
Cypripedium reginae, photographed by Rob Foster
fig. e Rob Foster, CC BY 4.0 / obs. 138426697
Cypripedium reginae, photographed by Rob Foster
fig. f Rob Foster, CC BY 4.0 / obs. 138427053
Cypripedium reginae, photographed by Renee MacQuarrie
fig. g Renee MacQuarrie, CC BY 4.0 / obs. 140005308
Cypripedium reginae, photographed by scaup
fig. h scaup, CC BY 4.0 / obs. 139701309

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 = 2,439 observations

Peak flowering in Jun, from 2,439 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 12 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.

  • Calceolus reginae (Walter) Nieuwl.
  • Cypripedium album Aiton
  • Cypripedium canadense Michx.
  • Cypripedium hirsutum f. album R.Hoffm.
  • Cypripedium hirutum f. album Ralph Hoffm.
  • Cypripedium reginae f. albolabium Fernald & B.G.Schub.
  • Cypripedium reginae f. album (Aiton) House
  • Cypripedium reginae f. reginae
  • Cypripedium reginae var. album (Aiton) Rolfe
  • Cypripedium spectabile Salisb.
  • Cypripedium spectabile var. album Sweet
  • Cypripedium spectabile var. incarnatum Sweet

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.