Aristolochia californicaTorr.

California Dutchman's Pipe

WFO wfo-0000547621 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Aristolochia californica, photographed by Mary K. Hanson
fig. a Mary K. Hanson, CC BY 4.0 / 2022-04-30 / obs. 192354295
Aristolochia californica, photographed by Michael Warner
fig. b Michael Warner, CC BY 4.0 / obs. 187432973
Aristolochia californica, photographed by Michael Warner
fig. c Michael Warner, CC BY 4.0 / obs. 180181373
Aristolochia californica, photographed by Mary K. Hanson
fig. d Mary K. Hanson, CC BY 4.0 / obs. 191999795
Aristolochia californica, photographed by Mary K. Hanson
fig. e Mary K. Hanson, CC BY 4.0 / obs. 187725005
Aristolochia californica, photographed by Dee Shea Himes
fig. f Dee Shea Himes, CC BY 4.0 / obs. 191362895
Aristolochia californica, photographed by Jeff Harter
fig. g Jeff Harter, CC BY-SA 4.0 / obs. 199025971
Aristolochia californica, photographed by Steve Woodward
fig. h Steve Woodward, CC0 1.0 / obs. 181375585

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 = 525 observations

Peak flowering in Feb, from 525 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 1 synonym

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.

  • Isotrema californicum (Torr.) H.Huber

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.