Distribution: Occurring on both sides of the Cascades in Washington; common and widespread throughout much of North America.
Habitat: Fields and waste places.
Origin: Introduced from Europe
Conservation Status: Not of concern
Winter annual or biennial, 3-15 dm. tall, glabrous, with milky juice.
Leaves prickly on the midrib beneath and on the margins, pinnately lobed (or entire in one variety), twisted at the base to lie in a vertical plane, sagittate-clasping, 5-30 cm. long and 1-10 cm. wide.
Heads numerous, 13-27 flowered, the flowers yellow, all ligulate; involucre 10-15 mm. high, cylindric but broadening at the base, the bracts imbricate; pappus of white capillary bristles.
Achenes gray or yellowish, the body 3-4 mm. long and a third as wide, compressed, prominently several-nerved on each face, with fine spines above, the beak as long to twice as long as the body.