Distribution: Asotin County, Washington and Grant County, Oregon, to Payette County, Idaho, south to California and Colorado.
Habitat: Gravelly to heavy clay soil in the hills and lower mountains.
Flowers: April - June
Conservation Status: Threatened in Washington (WANHP)
Herbaceous, rather fleshy perennial from a large, woody root, the stems prostrate or decumbent, 1-3 dm. long.
Leaves opposite, obovate to oval, 2-6 cm. long and nearly as broad, glabrous except for small, marginal hairs.
Inflorescence usually of terminal umbels, the central one 5-10 flowered, with peduncle and pedicles 2-4 cm. long, the lateral ones few-flowered and sessile; sepals 5, linear to lanceolate, 5-9 mm. long, green, with long, fine, tangled hairs; corolla pale greenish-yellow, the 5 lobes lanceolate, 8-12 mm. long, reddish tinged on the back, reflexed; stamens 5, attached to the base of the corolla tube and to each other, forming a column, to which are attached saccate structures, pinkish, bi-lobed above, the lobes projecting into erect teeth that exceed the anthers; pistil 1, 2-carpellary, the ovaries superior and distinct.
Follicles ovoid, 3-5 cm. long, smooth.