Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across most of North America.
Habitat: Disturbed areas, particularly near cities and towns.
Origin: Introduced from Eurasia
Growth Duration: Annual
Conservation Status: Not of concern
Annual, the erect stem simple to freely-branched, 1-4 dm. tall, glabrous above but pubescent near the base with simple, spreading hairs.
Leaves many in a basal rosette, oblanceolate, remotely serrulate, 1-4 cm. long, with stiff, simple and forked hairs; cauline leaves alternate, lanceolate, nearly sessile, 5-20 mm. long, the upper ones glabrous.
Inflorescence of open, terminal, many-flowered racemes; pedicels slender, 5-10 mm. long; sepals 4, 1.5 mm. long; petals 4, white, 3 mm. long, narrowly obovate with a wedge-shaped base; stamens 6; style 0.1-0.4 mm. long.
Siliques linear, glabrous, 10-15 mm. long and less than 1 mm. broad.