Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed areas generally at low elevations.
Origin: Introduced from Europe
Conservation Status: Not of concern
Ill-smelling, glabrous, branched annual, 1-6 dm. tall.
Leaves 2-6 cm. long, 2 or 3 times pinnatifid, with very narrow segments.
Heads fairly numerous, short-pedunculate at the ends of the branches, the disk 5-10 mm. wide, becoming ovoid at maturity; involucre with a few soft hairs, the bracts imbricate, dry, their margins papery; rays 10-20, white, sterile and neutral, 5-11 mm. long; disk flowers perfect, yellow; receptacle chaffy only towards the middle, its firm, narrow, awn-shaped bracts tapering to the apex; pappus none.
Achenes sub-terete, 10-ribbed, with small glandular bumps.