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Perennial herb from a much-branched taproot; forming cushions 10-50 cm across; stems slender, erect or ascending, many, simple or 2- to rarely 3-branched, glabrous, 0.6-2.5 cm tall.
Basal leaves linear-lanceolate, 0.5-1.8 cm long, less than 1 mm wide, glabrous, densely crowded, 1- or obscurely 3-nerved; stem leaves opposite, 2-6 pairs, 0.2-1.4 cm long, glabrous, with clustered secondary leaves in their axils; stipules lacking.
Inflorescence of solitary or 2, rarely 3 flowers in an open cluster; petals 5, white, oblanceolate, 2.0-3.5 mm long; sepals 5, greenish-purple, elliptic, obtuse, 2-4 mm long, faintly 1- to 3-nerved, glabrous.
Capsules narrowly egg-shaped, 3-4.5 mm long, 3- to 5-valved; seeds 0.5-0.8 mm long, chestnut-brown, minutely roughened.
Source: The Illustrated Flora of British Columbia