Distribution: Occurring east of the Cascades crest in Washington; northeastern Washington to Baja California, Mexico, east to Idaho, Utah, and Arizona.
Habitat: Sagebrush desert, usually along vernal stream beds.
Conservation Status: Not of concern
Mostly glabrous perennial herbs from rhizomes, the stems 3-8 dm. tall, the juice milky.
Leaves mostly whorled and 3-6 per node, the upper often opposite, linear-lanceolate to narrowly oblanceolate, 5-15 cm. long and 3-12 mm. broad.
Inflorescence of many-flowered umbels, usually 2 or more in the upper axils, puberulent; peduncles 2-6 cm. long, pedicels 2-15 mm. long; sepals 5, greenish to pinkish-tinged, 2 mm. long, puberulent; corolla lobes 5, 2-4.5 mm. long, pale to dark pinkish-purple; stamens 5, attached to the base of the corolla tube and to each other, forming a column, to which are attached saccate structures 1-2 mm. long, with longer, erect projections; pistil 1, 2-carpellary, the ovaries superior and distinct.
Follicles erect, 6-12 cm. long, narrow, smooth.