Distribution: Broadly distributed in Washington, but chiefly east of the Cascades in Washington; Alaska to California, east to Labrador and New Jersey.
Habitat: Moist areas, low to fairly high elevations in the mountains
Conservation Status: Not of concern
Colonial tree, dioecious, up to 15 m. tall, with smooth, greenish-white bark that becomes blackish and somewhat rough on very old trunks; bud scales shiny, but not resinous.
Leaves alternate, relatively small, on slender, laterally-flattened petioles half to fully as long as the blade; blades rotund-ovate to reniform-cordate, 2.5-9 cm. long and 2.5-8 cm. wide, shortly acuminate, paler beneath, the margins finely toothed and hairy, the surfaces glabrous at maturity.
Catkins drooping; the bracts subtending the flowers in the catkins persistent, deeply cleft into a few slender lobes with long, white hairs on the margins; staminate catkins elongating to 2-3 cm. then deciduous; stamens 6-14; pistillate catkins at maturity 4-10 cm. long, with numerous fruits; stigmas 2, each deeply cleft into 2 or more slender lobes.
: Capsules lanceolate, 4-6 mm. long, on pedicles 1-2 mm. long