Page authors: Don Knoke, David Giblin
Oxalis oregana
redwood-sorrel, Oregon wood-sorrel

Distribution: Occurring west of the Casades crest in Washington; Olympic Mountains and west slope of the Cascades in Washington; British Columbia south to California.

Habitat: Moist woods, low to moderate elevations.

Flowers: April-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Apomixis, bumblebees, flies


Acaulescent perennial from scaly rhizomes.


Leaves trifoliate, on petioles 3-20 cm. long that are covered with soft, brown hairs, jointed to the stipules; leaflets obcordate, up to 4.5 cm. broad, drooping.


Scapes 5-15 cm. tall, single-flowered, with 2 bracts near the flower; sepals 5, persistent; petals 5, 13-20 mm. long, white to pinkish, with reddish veining; stamens 10, the lower 2 mm. united in a tube, 5 filaments longer than the other 5; styles 5.


Capsule 5-celled, 7-9 mm. long, ovoid.

Accepted Name:
Oxalis oregana Nutt.
Publication: Fl. N. Amer. 1(2): 211. 1838.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Oxalis oregana in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Oxalis oregana checklist entry

OregonFlora: Oxalis oregana information

E-Flora BC: Oxalis oregana atlas page

CalPhotos: Oxalis oregana photos

23 photographs:
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