Distribution: Introduced and common in most of Canada and the United States; more common east of the Cascades
Habitat: Disturbed ground, lawns and gardens
Flowers: March - September
Origin: Introduced from Europe
Conservation Status: Not of concern
Stiff-hairy, glandular biennial or perennial, the stems sprawling but the flowering stems erect, 2-4 dm. tall.
Leaves of the prostrate stems opposite, crowded, oblanceolate, 10-25 mm. long and 2-5 mm. broad; leaves of the flowering stems opposite, widely spaced, up to 4 cm. long and 15 mm. broad.
Flowers several in an open, dichotomously branched inflorescence; sepals 5, 4-7 mm. long, stiff-hairy; petals 5, white, bi-lobed, equaling the sepals; stamens 10; styles 5.
Capsule membranous, cylindric, slightly curved, twice as long as the sepals, opening by 10 teeth.