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Annual or sometimes perennial from slender rhizomes; stems weak and trailing, freely rooting, strongly 4-angled, glabrous, up to 50 cm long.
Leaves opposite, elliptic to oblanceolate, 5-15 mm long, 1.5-5 mm wide, unstalked or some of the lower ones narrowed to distinct stalks, glabrous except for some hairs on the margins, the margins sometimes strongly wrinkled-curly; stipules lacking.
Inflorescence of a few flowers in axillary or terminal, papery-bracted clusters; petals 5, white, deeply 2-cleft, shorter than the sepals; sepals 5, narrowly lanceolate, abruptly sharp-pointed, 2.5-3.5 mm long, glabrous.
Capsules egg-shaped, 3-4 mm long, 6-valved; seeds about 0.6 mm long, strongly pimply-wrinkled.
Source: The Illustrated Flora of British Columbia