Distribution: East of the Cascades in Washington in a few scattered localities; widely distributed across the United States from Washington to California, east to the Gulf Coast states.
Habitat: Emergent in muddy soils of ponds, lakes, ditches, rivers, and streams.
Conservation Status: Presumed extirpated in Washington (WANHP)
Glandular annual with erect to decumbent, freely-branched stems 0.5-3 dm. long.
Leaves opposite, short petioled, elliptic to oblanceolate, 2-4 cm. long, glandular-denticulate; stipules whitish, glandular.
Flowers 1-several in the leaf axils, pedicels short; sepals 5, about 3 mm. long, keeled, coarsely glandular-denticulate and pubescent; petals 5, white, shorter than the sepals, regular; stamens 10; ovary superior; styles short, distinct.
Capsule globose, seeds numerous.