Oxalis oregana, known as redwood sorrel or Oregon oxalis, is a species of the wood sorrel family. It is native to moist Douglas-fir and coastal redwood forests of western North America from southwestern British Columbia to Washington, Oregon, and California.
It is a short, herbaceous perennial with erect flowering stems and three leaflets that are heart-shaped, with purplish undersides. The white and pink flowers have five petals and sepals. It spreads underground by rhizomes and it can be seen throughout moist forests.