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Low shrub, 20-60 (90) cm tall, from long creeping rhizome; stems erect, smooth, with thin wiry branches.
Alternate, deciduous, short-stalked, oval to oblong-egg-shaped, 2-7 cm long, coarsely double-toothed mostly above the middle, dark green above, paler below, smooth.
Inflorescence a branched, nearly flat-topped, terminal cluster of numerous small flowers; corollas white, sometimes pink-tinged, the petals 5, circular, about 2 mm long; calyces smooth on the outside, 5-lobed, the lobes triangular, erect to spreading, about 1 mm long; ovaries superior; stamens numerous.
Follicles, usually 5, about 3 mm long, beaked, somewhat leathery, smooth except sometimes a few long hairs along the suture, shining; seeds several, spindle-shaped.
Source: The Illustrated Flora of British Columbia