Distribution: In Washington known only from the southeast corner; British Columbia to Oregon, east to Idaho and Montana; also in central and eastern North America.
Habitat: Stream banks, woods, marshes and wet meadows.
Origin: Introduced from Europe
Conservation Status: Not of concern
Straggling, herbaceous perennial, the stems decumbent to ascending, simple or branched, up to 6 dm. tall, pubescent above.
Leaves opposite, ovate, the tip acute, the lower leaves petiolate, gradually reduced upward, becoming sessile above
Flowers solitary in the leaf axils, long petiolate; sepals 5, green, linear-oblanceolate; petals 5, white, deeply notched, about 7 mm. long, much longer than the sepals; stamens 10; styles 5.
Capsule globose-ovoid, opening by 5 valves.