Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America except southern and southeastern regions of U.S.
Habitat: Ditches, marshes and muddy meadowlands.
Conservation Status: Not of concern
Usually glabrous perennial from slender, fibrous roots, the stems several, one or more of them stolonous and freely-rooting, 1-4 dm. long, the others scapose, 5-30 cm. tall.
Basal leaves with petioles 1-5 times the length of the blades, the blades cordate-lanceolate to rhombic, 1.5-3.5 cm. long and nearly as broad, 3-lobed at the tip; cauline leaves few, considerably reduced, alternate.
Flowers 1-several on the scapes, bracteate; pedicels 2-6 cm. long; sepals 5, greenish-yellow, 2-4 mm. long; petals 5, pale yellow, 5-8 mm. long; nectary scale glabrous, about 0.4 mm. long, forming a pocket, laterally attached full length; receptacle cylindric, 3-10 mm. long; stamens 15-30; pistils 50-200.
Achenes glabrous, laterally compressed, 2- to 4-nerved on each face, 1.5 mm. long; stylar beak stout, straight, 0.5 mm. long.