Perennial herb from a deep, stout taproot and a much-branched stem-base; forming mats as much as 30 cm wide; stems trailing to ascending, several, branched, glandular-hairy, 4-12 cm tall/long; flowering stems brittle.
Basal leaves lacking; stem leaves opposite, 6-10 mm long, about 1 mm wide, glandular-hairy, usually overlapping except on the upper part of the flowering stems, linear awl-like to narrowly lanceolate, 3-nerved, the middle nerve usually much more prominent, secondary leaves usually clustered in the axils of the numerous primary leaves along the stems; stipules lacking.
Inflorescence few- to many-flowered in a compact, spreading cluster; petals oblong, obtuse, 3.5-4 mm long; sepals, 4-6 mm long, linear-lanceolate to lanceolate-egg-shaped, long-pointed or abruptly sharp-pointed, obscurely 3-nerved.
Capsules egg-shaped, 3-5 mm long, 3-valved; seeds dark brown, plump, 1.0-1.3 mm long, prominently elongate-pimply in concentric rows.
Source: The Illustrated Flora of British Columbia