Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.

Habitat: Slow-moving streams and ditches.

Flowers: June-August

Origin: Native

Growth Duration: Biennial, Perennial

Conservation Status: Not of concern

Pollination: Bees, flies

Glabrous, short-lived perennial from fibrous roots, the stems usually erect, 2-10 dm. tall.

Leaves opposite, sessile and clasping, elliptic-ovate to elliptic-oblong, 3-5 times as long as wide, entire.

Inflorescence of few-flowered racemes on long peduncles arising in the leaf axils; calyx of 4 broad, blunt sepals; corolla white to pink, rotate, 4-lobed, the upper lobe the largest, about 5 mm. wide; style 1.5-2.5 mm. long; pedicels spreading, 3-8 mm. long; stamens 2.

swollen, 2.5-4 mm. high and a little wider, shallowly notched.