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.
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