Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across Canada and most of the United States to the Atlantic Coast.

Habitat: Common in lake and pond shore margins, riparian zones, wetlands, and other wet areas at low elevations.

Flowers: July-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bumblebees, bees, butterflies

Aromatic, perennial herbs from creeping rhizomes, the square stems ascending to erect, pubescent, 2-8 dm. tall.

Leaves opposite, all cauline, short-petiolate, glabrous or hairy, 2-8 cm. long and 6-40 mm. wide, serrate, acuminate, narrowly ovate to rhombic-elliptic, with several pairs of lateral veins.

Flowers in compact verticels in the axils of the upper leaves, the verticels well separated; calyx pubescent, 2.5-3 mm. long, regular, 5-lobed, 10-nerved; corolla nearly regular, four-lobed, with a short tube, white to lavender or pink, 4-7 mm. long; stamens 4, equal, exerted; style 2-parted; ovary 2-celled, superior.

Nutlets 4