Oxalidaceae
Wood-Sorrel Family
1 genera
6 species
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Oxalis corniculatacreeping yellow wood-sorrel
Distribution: Scattered locations throughout Washington; distributed widely throughout North America.
Habitat: A weed of gardens, disturbed areas, and waste places.
Origin: Introduced from Europe
Flowers: May-October
Oxalis dilleniislender yellow wood-sorrel
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington south to Oregon, east across North America to the Atlantic Coast.
Habitat: Open areas, often where moist, at low elevations.
Origin: Introduced
Flowers: February-October
Oxalis oreganaredwood-sorrel, Oregon wood-sorrel
Distribution: Olympic Mountains and west slope of the Cascades in Washington; British Columbia south to California.
Habitat: Moist woods, low to moderate elevations.
Origin: Native
Flowers: April-September
Oxalis strictaupright yellow wood-sorrel
Distribution: Distributed on both sides of the Cascades in Washington, more common west of the Cascades; widely distributed throughout North America.
Habitat: Disturbed ground, lawns and gardens.
Origin: Introduced
Flowers: April-September
Oxalis suksdorfiiwestern yellow wood-sorrel
Distribution: West of the Casccades in Washington; southern Washington to northwest California.
Habitat: Low elevations, usually in moist, coastal woods but sometimes on rather dry, open slopes.
Origin: Native
Flowers: April-August
Oxalis trilliifoliagreat wood-sorrel, trillium-leaf wood-sorrel
Distribution: West slope of the Cascades in Washington; Washington south to northwest California.
Habitat: Meadows and moist woods in the coastal mountains and up to 6000 feet in the Cascades.
Origin: Native
Flowers: May-August