Distribution: Common in Idaho and Montana, east to Pennsylvania
Habitat: Moist soil, especially along streams, low to mid-elevations
Flowers: May - July
Conservation Status: Not of concern
Deciduous, many-stemmed shrub 2-6 m. tall, spreading by layering of decumbent or prostrate stems; younger branches bright reddish to reddish-purple, becoming grayish-green with age.
Leaves opposite, petiolate, the blades ovate to elliptic-ovate, acuminate, 4-12 cm. long, greenish on the upper surface and much paler below.
Flowers in flat-topped cymes, without showy bracts; sepals 4, very small; petals 4, white, 2-4 mm. long; stamens 4; style 1, 1-3 mm. long.
Drupe 7-9 mm. long, white to bluish, glabrous to pubescent.