Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to Oregon.
Habitat: Lowlands, prairies and coastal bluffs.
Conservation Status: Not of concern
Annual from a taproot, the several stems erect to decumbent, 1-2.5 dm. tall, glandular-puberulent at least above.
Leaves opposite, linear but tapering, 3-nerved, 3-18 mm. long, the primary ones with bundles of secondary leaves or short branches in their axils.
Flowers many in an open, diffuse inflorescence that is often over half the length of the plant; pedicels very slender, up to 25 mm. long; sepals 5, lanceolate, pointed, 3-nerved, 2.5-3.5 mm. long; petals 5, white, broadly obovate, up to 11/2 times as long as the sepals; stamens 10; styles 3.
Capsule ovoid, longer than the sepals, opening by 3 valves.