Distribution: Occurring chiefly west of the Cascades crest and along the Columbia River in Washington; British Columbia to California, east across most of North America to the Atlantic Coast;
Habitat: A weed of gardens, disturbed areas, and waste places.
Flowers: May-October
Origin: Introduced from Europe
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Apomixis, bumblebees, flies
Herbaceous perennial without rhizomes, but the stems trailing and freely rooting, glabrous or with appressed, aligned hairs; erect portions of the stems up to 1 dm. tall, the herbage usually brownish-red.
Leaves alternate, trifoliate, long-petiolate, the leaflets obcordate, 1-4 cm. long, drooping; stipules brownish, from fairly broad and 2-4 mm. long to linear and under 1.5 mm. long.
Flowers 2-5 on long, axillary peduncles; sepals 5, persistent; petals 5, yellow, 4-8 mm. long, entire; stamens 10, of 2 unequal lengths, the filaments glabrous; pistil 5-celled; styles 5, slender, distinct.
Capsule oblong, 1.5-2.5 cm. long, grayish-hairy.
PNW Herbaria: Specimen records of Oxalis corniculata in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Oxalis corniculata checklist entry
OregonFlora: Oxalis corniculata information
E-Flora BC: Oxalis corniculata atlas page
CalPhotos: Oxalis corniculata photos