Distribution: Occurring east of the Cascades crest in Washington, where known historically from Klickitat County (likely extirpated); Washington to California, east to the Great Plains and the central U.S.

Habitat: Emergent in muddy soils of ponds, lakes, ditches, rivers, and streams.

Flowers: June-September

Origin: Native

Growth Duration: Annual

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.