Distribution: West of the Cascades and mostly along the coast, British Columbia south to northwest California.
Habitat: Moist, usually swampy places, mostly at low elevations.
Flowers: Late March - May
Conservation Status: Not of concern
Glabrous, prostrate, mat-forming perennial, the stems dichotomously branched, freely rooting, up to 2 dm. long.
Leaves opposite, with petioles up to 2 cm. long; leaf blades oval to broadly ovate, their bases truncate to wedge-shaped, or reniform, with about 15-20 shallow, rounded teeth.
Flowers solitary in the upper leaf axils, on short pedicles, about 3 mm. broad; sepals 4, rounded; petals wanting; stamens 8.
Capsule 3-4 mm. long, carpels fused their length.