Distribution: In scattered locations east of the Cascades crest in Washington; Washington south to California, east to Idaho, Wyoming, Utah, and Colorado; also in Massachusetts.
Habitat: Weed of roadsides and ditch banks.
Origin: Introduced from Eurasia
Conservation Status: Not of concern
Freely-branched annual, strongly pubescent with forked hairs, the stem 1-4 dm. tall.
Leaves all cauline, alternate, short-petiolate, oblong-oblanceolate, 2-5 cm. long, remotely dentate.
Flowers sub-sessile in open, spike-like racemes; pedicles stout, 1 mm. long; sepals 4, not saccate; petals 4, white, spatulate, 1 mm. long, rounded or very shallowly notched; stamens 6; style stout, beaklike, nearly as long as the silicle.
Silicles obovoid, 2-3 mm. long, covered with pungent hairs.