Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east in Canada to Ontario, east in the U.S. to the Rocky Mountains and northern Great Plains.
Habitat: Moist areas, streambanks at low elevations.
Conservation Status: Not of concern
Monoecious, deciduous shrubs or small trees to 8 m. tall, the young twigs with crystalline glands, the older wood smooth and coppery to reddish-brown, not peeling.
Leaves alternate, usually glandular, the blades usually ovate to suborbicular, the tip rounded to acute, the base usually rounded, the margins sharply once- or twice-serrate.
Staminate catkins elongate and pendulous, 1-4 per cluster; pistillate catkins erect, 2-4 cm. long and 4-10 mm. thick, the naked flowers subtended by a 3-lobed bract, puberulent and with marginal hairs.
Samara, the wings about as broad as the pubescent nutlet.