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General:
Perennial herb from a thick root; stems usually much-branched, glabrous and more or less glaucous, 0.4-1.2 m tall.
Leaves:
Basal leaves lacking; stem leaves opposite, lanceolate to linear, 2-10 cm long, rarely over 2-9 mm wide, 1-nerved, unstalked; stipules lacking.
Flowers:
Inflorescence of numerous flowers in a large, diffusely branched, leafy-bracted, panicle-like cluster; flowers stalks glabrous; petals 5, white, oblanceolate, rounded to somewhat notched, stalklike at the base, slightly exceeding the calyces, about equalling the 10 stamens; sepals 5, glabrous, the white membrane below the notches contrasting strongly with the usually purplish back of the 5 lobes, united, forming a top-shaped tube 1.5-2 mm long.
Fruits:
Capsules egg-shaped, 2-3 mm long, 4-valved; seeds 2-5, blackish, 1.5-2 mm long, prominently cross-wrinkled and pimply in longitudinal, concentric rows.
Source: The Illustrated Flora of British Columbia
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