Oxalis oreganaNutt.

Oregon woodsorrel

WFO wfo-0000386872 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Oxalis oregana, photographed by Hilary Rose Dawson
fig. a Hilary Rose Dawson, CC BY 4.0 / 2022-05-01 / obs. 193612457
Oxalis oregana, photographed by Roger Rittmaster
fig. b Roger Rittmaster, CC BY 4.0 / obs. 204083103
Oxalis oregana, photographed by Alan Rockefeller
fig. c Alan Rockefeller, CC BY 4.0 / obs. 165172526
Oxalis oregana, photographed by James H. Thomas
fig. d James H. Thomas, CC BY 4.0 / obs. 190414839
Oxalis oregana, photographed by sprcrkwild
fig. e sprcrkwild, CC BY 4.0 / obs. 193241003
Oxalis oregana, photographed by Jesse Grove
fig. f Jesse Grove, CC0 1.0 / obs. 138694521
Oxalis oregana, photographed by Jared Shorma
fig. g Jared Shorma, CC BY 4.0 / obs. 159762480
Oxalis oregana, photographed by rappman
fig. h rappman, CC BY 4.0 / obs. 138466601

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 = 1,920 observations

Peak flowering in May, from 1,920 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 5 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.

  • Acetosella oregana (Nutt.) Kuntze
  • Oxalis acetosella subsp. oregana (Nutt.) D.Löve
  • Oxalis acetosella var. oregana (Nutt.) Trel.
  • Oxalis oregana var. tracyi Jeps.
  • Oxys oregana (Nutt.) 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.