General:
Deciduous, erect, large shrub, 1-4 m tall; twigs glabrous; bark smooth, grey.

Leaves:
Opposite, stalked, broadly egg-shaped to nearly round in outline, 5-13 cm long, all deeply and sharply 3-lobed, coarsely blunt-toothed, nearly glabrous or hairy beneath on the veins; stalks with a shallow groove and small glands upward.

Flowers:
Inflorescence a flattish cluster of several to many flowers, 5-15 cm across, with sterile marginal flowers much larger than the fertile inner ones; petals white, fused at bases into tubes that spread (1.5-2.5 cm wide) to 5 large lobes in the marginal flowers, to 3-4 mm wide in the small inner flowers; stamens conspicuous, exserted of corolla, the filaments 3-5 mm long.

Fruits:
Berrylike drupes, clustered, scarlet, 0.8-1.5 cm long, each with a single, large, flattened stone.

Source:  The Illustrated Flora of British Columbia