Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to the Atlantic Coast.

Habitat: Wet ground.

Flowers: July-September

Origin: Both native and introduced from eastern North America

Growth Duration: Annual

Conservation Status: Sensitive in Washington (WANHP)

Pollination: Bumblebees, bees, flies, wasps

Perennial from short, leafy rhizomes, the stems upright, 1-5 dm. tall, simple or branched above.

Leaves opposite, sessile, lanceolate to oblong, rounded, 1-3.5 cm. long, 5- to 7-nerved.

Inflorescence of terminal cymes with small, linear bracts; sepals 5, lanceolate, 4-7 mm. long; petals 5, yellow, about equal to the sepals; stamens 15-35, the filaments almost capillary, distinct; styles 3, short.

Capsule 3-celled.