Distribution: Both sides of the Cascades in Washington; Alaska east to the Atlantic coast; south in the Rocky Mountains to Colorado.
Habitat: Wet soil, often in bogs.
Conservation Status: Not of concern
Herbaceous perennial from slender rhizomes, the stems 1-4 dm. tall, gray from fine, appressed hairs.
Leaves mostly opposite, sessile, entire to denticulate, obtuse, linear to lanceolate, 2-6 cm. long and 4-6 mm. broad.
Inflorescence loosely racemose to paniculate; pedicels slender, 1-4 cm. long; calyx tube 1-1.5 mm. long, the 4 lobes twice as long; petals 4, 3-5 mm. long, notched, white to pinkish; stamens 8; styled shorter than the petals; stigma 1 mm. long, shallowly 4-lobed; ovary inferior, 4-celled.
Capsule 3-6 cm. long, linear, grayish; seeds with a tuft of white to tawny hairs at the tip.