Distribution: Occurring west of the Cascades crest along the coast in Washington; Alaska to California; also in central Canada and northeastern North America.
Habitat: Coastal tidelands and mudflats.
Growth Duration: Annual
Conservation Status: Not of concern
Glabrous or glandular-pubescent annual, the stems several, erect or ascending, up to 2.5 dm. long and about 1 mm. thick.
Leaves opposite, not fascicled, up to 4.5 cm. long and 1-1.5 mm. broad, blunt to acute; stipules scarious, 1.5-3 mm. long and broad.
Flowers in open, leafy, terminal cymes; sepals 5, distinct, glabrous to glandular-pubescent, 3-4.5 mm. long; petals 5, white or pink, nearly equalling the sepals; stamens 2-5; styles 3, 0.3-0.4 mm. long.
Capsule dehiscent by 3 valves, longer than the calyx