Distribution: Occurring on both sides of the Cascades crest in Washington, though more common west of the crest; Alaska to California, east to the Rocky Mountains, Great Lakes region, and northeastern North America.
Habitat: Moist areas, often where disturbed, at low elevations; common garden weed.
Origin: Introduced from Europe
Conservation Status: Not of concern
Mostly glabrous biennial or perennial, the slender stems mostly prostrate and free-rooting, up to 15 cm. long.
Leaves opposite, linear and sharp-pointed, often with bundles of secondary leaves in the axils; basal leaves 1-2.5 cm. long, numerous in persistent rosettes.
Flowers 2-several per stem; pedicels filiform, 5-25 mm. long; sepals usually 4, rounded, about 2 mm. long; petals 4, white, half as long as the sepals or wanting; stamens and styles 5.
Capsule up to twice as long as the sepals, opening by 4 or 5 valves.