Sidalcea oregana(Nutt. ex Torr. & A.Gray) A.Gray

Oregon Checker-mallow

WFO wfo-0001077132 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Sidalcea oregana, photographed by Diego Blanco
fig. a Diego Blanco, CC0 1.0 / 2021-08-03 / obs. 148691705
Sidalcea oregana, photographed by Diego Blanco
fig. b Diego Blanco, CC0 1.0 / obs. 148691809
Sidalcea oregana, photographed by Diego Blanco
fig. c Diego Blanco, CC0 1.0 / obs. 148691720
Sidalcea oregana, photographed by Laura Holloway
fig. d Laura Holloway, CC0 1.0 / obs. 144160303
Sidalcea oregana, photographed by Aaron Liston
fig. e Aaron Liston, CC BY 4.0 / obs. 20393553
Sidalcea oregana, photographed by Charles Swift
fig. f Charles Swift, CC BY 4.0 / obs. 8791429
Sidalcea oregana, photographed by Drew Meyer
fig. g Drew Meyer, CC0 1.0 / obs. 137993596
Sidalcea oregana, photographed by chrismo
fig. h chrismo, CC BY 4.0 / obs. 180620885

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 = 367 observations

Peak flowering in Jul, from 367 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 17 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.

  • Callirhoe spicata Regel
  • Sida oregana Nutt. ex Torr. & A.Gray
  • Sidalcea eximia Greene
  • Sidalcea hydrophila A.Heller
  • Sidalcea maxima M.Peck
  • Sidalcea nervata A.Nelson
  • Sidalcea oregana var. calva C.L.Hitchc.
  • Sidalcea oregana var. maxima (M.Peck) C.L.Hitchc.
  • Sidalcea oregana var. nevadensis C.L.Hitchc.
  • Sidalcea oregana var. oregana
  • Sidalcea oregana var. procera C.L.Hitchc.
  • Sidalcea oregana var. spicata (Regel) Jeps.
  • Sidalcea spicata (Regel) Greene
  • Sidalcea spicata subsp. valida (Greene) Wiggins
  • Sidalcea spicata subsp. valida (Greene) Wiggins
  • Sidalcea spicata var. tonsa M.Peck
  • Sidalcea valida Greene

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.