Distribution: Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to Mexico, east to the Great Plains and Great Lakes region.
Habitat: Riparian corridors, irrigation ditches, roadsides, and other at least seasonally wet areas at low elevations, often in loam soils.
Growth Duration: Perennial
Conservation Status: Not of concern
Perennial herb from widespread rhizomes, the stems 4-12 dm. tall, gray-woolly throughout, the juice milky.
Leaves opposite, petiolate, oblong-lanceolate to ovate-oblong, 10-20 cm. long and up to 10 cm. broad, transversely veined
Inflorescence of several umbels with peduncles 3-8 cm. long and pedicels 1-3 cm. long; sepals 5, greenish, tinged with red; petals about 1 cm. long, pink to purplish-red; stamens 5, attached to the base of the corolla tube and to each other, forming a column, to which are attached saccate structures considerably longer that the petals, pink, with incurved projections; pistil 1, 2-carpellary, the ovaries superior and distinct.
Follicles narrowly ovoid, warty, 7-11 cm. long, the seeds flattened, rough, 8 mm. long.