Distribution: Chiefly east of the Cascade summits in Washington; British Columbia to California, east to Colorado.
Habitat: Moist to rather dry areas, foothills to high elevations in the mountains.
Conservation Status: Not of concern
Slender, erect, glabrous annual, the simple or moderately-branched stem 5-20 cm. tall.
Leaves linear-elliptic, 1-2 cm. long and up to 5 mm. broad, the lower in whorls of 4, one pair smaller, the upper merely opposite.
Flowers solitary in the axils, the peduncles elongating up to 3 cm. in fruit, widely spreading, the fruit nodding; calyx obsolete; corolla white, 3-lobed, minute, soon deciduous; ovary 2-celled, inferior.
Fruit dry, 2.5-3.5 mm. high, pubescent with short, hooked hairs.