Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and Great Plains.
Habitat: Moist woods from sea level to mid-elevations in the mountains.
Conservation Status: Not of concern
Shrub or small tree 1-10 m. tall; stems glabrous, the bark grayish to reddish-purple.
Leaves opposite, glabrous to sparsely glandular-puberulent, 2-14 cm. long and nearly as broad, cordate, palmately 3-5 lobed, coarsely serrate, paler on the lower surface.
Plants monoecious to dioecious, staminate flowers with only rudiments of a pistil, but pistillate flowers with well-developed, though not always fertile, stamens; flowers about 8 mm. broad, in flat-topped clusters in the leaf axils; sepals usually 5; petals equal in size and number, or lacking; stamens usually 10, inserted on the outer edge of a lobed disk; styles and stigmas 2; ovary superior, 2-celled.
Samaras 2.5-3 cm. long, the wings not divergent.