Distribution: Occasionally escaping cultivation in lowland northwestern Washington; British Columbia to Oregon, east across northern U.S. and southern Canada to Atlantic Coast.
Habitat: Fields, roadsides, waste sites.
Conservation Status: Not of concern
Rhizomatous, mat-forming perennials, the flowering stems ascending, branched, 15-40 cm. long; non-flowering stems prostrate, readily rooting; herbage densely white-woolly.
Leaves opposite, sessile, linear to linear-lanceolate, 10-60 mm. long and 2-8 mm. wide, not glandular.
Inflorescences of lax, 3- to 13-flowered, bracteate cymes; pedicles ascending, straight, 10-40 mm. long; flowers white, 12-20 mm. in diameter; sepals 5, narrowly lanceolate-elliptic, 5-7 mm. long; petals 5, deltoid, 2 lobed, white, 10-18 mm. long; stamens 10; styles 5.
Capsules cylindric, slightly curved, 10-15 mm. long, with 10 erect teeth.