Distribution: Widely distributed in Washington; introduced throughout much of North America.
Habitat: Weed of moist ground and disturbed areas in the lowlands.
Origin: Introduced from Europe
Conservation Status: Not of concern
Stout, tap-rooted biennial, the stem prickly and angled, 0.5-2 m. tall.
Leaves opposite, prickly on the midrib beneath, otherwise mostly glabrous, the basal ones oblanceolate, wavy-margined, dying early in the second season; cauline leaves lanceolate, entire, the pairs uniting at the base to form a cup.
Inflorescence of dense, ovoid or cylindric, erect heads 3-10 cm. long, terminating the long, naked peduncles; involucre bracts linear, prickly, curved upward, unequal, the longer ones surpassing the heads; bracts on the receptacle awn-tipped; calyx cup-shaped, 4-angled, silky, 1 mm. long; corolla slender, whitish, the tube 10-15 mm. long, with 4 short, purplish lobes; stamens 4.
Fruit dry, indehiscent, 5 mm. long.