Distribution: Occurring in south-central Washington; Washington south to California, east to Wyoming and New Mexico.
Habitat: Open desert and sagebrush slopes.
Growth Duration: Annual, Biennial
Conservation Status: Not of concern
Glabrous, glaucous annual, the stem simple to freely-branched, 1.5-5 dm. tall.
Basal and lower cauline leaves narrowly oblanceolate, 3-6 cm. long, wavy-dentate, deciduous by flowering; upper cauline leaves linear, entire.
Inflorescence of open, elongate, bractless racemes; pedicles 1.5-3 mm. long, reflexed; sepals 4, somewhat spreading and saccate at the base, 2-3 mm. long, greenish, scarious-margined; petals 4, narrowly spatulate, slightly longer than the sepals, white with purplish veins; stamens 6, the filaments equaling the petals; style lacking.
Siliques reflexed-appressed, strongly compressed, 3.5-4.5 cm. long and 1.5 mm. broad, the valves narrowed to a slender, beak-like tip 3.5 mm. long; seeds in 1 series.