Distribution: Both sides of the Cascades in Washington; British Columbia south to California.
Habitat: Moist areas in deep woods to forest openings.
Conservation Status: Not of concern
Glabrous, scapose, perennial herbs, spreading widely by rhizomes, the scapes 2-4 dm. tall.
Leaves with petioles 1-3 dm. long attached to the rhizome, the blades 5-20 cm. broad, trifoliate, the segments fan-shaped, coarsely wavy-dentate.
Flowers inconspicuous, numerous in terminal, pedunculate, bractless spikes; calyx and corolla lacking; stamens about 10, the filaments narrow below and broadened above; style lacking; stigma broad, lateral.
Fruits reddish-purple, 3-4 mm. long, puberulent, the ventral side concave with a prominent ridge, the dorsal surface strongly convex.