Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Sagebrush hills to alpine slopes, especially on gravelly benches or talus.
Conservation Status: Not of concern
Glandular-pubescent perennial from a stout taproot and branched woody base, the trailing stems forming mats up to 3 dm. broad; flowering branches 3-10 cm. tall, very brittle and tending to shatter readily.
Leaves opposite, 5-10 mm. long, 3-nerved, slender and tapering with a needle-like tip, over-lapping on the stem, with bundles of leaves in the axils of the primary leaves.
Flowers usually 7 or more in terminal clusters, the pedicels stout, 5-20 mm. long; sepals 5, lanceolate, pointed, 4-6 mm. long; petals 5, white, usually longer than the calyx; stamens 10; styles 3.
Capsule ovoid, shorter than the sepals, opening by 3 valves.