Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Open, disturbed areas including roadsides, pastures, prairies, grasslands and wastelots.
Origin: Introduced from Eurasia
Conservation Status: Not of concern
Nearly glabrous perennial from a rhizome, the usually simple stem 2-8 dm. tall.
Basal leaves petiolate, oblanceolate, 4-15 cm. long, with rounded teeth or lobes; cauline leaves reduced, becoming sessile, variable, with few or many blunt teeth or nearly entire.
Heads solitary on the ends of the branches on naked peduncles, the disk 10-20 mm. wide; involucre bracts narrow with a dark brown margin, the outer lance-triangular, the inner oblong; rays white, pistillate, fertile, 15-20, 1-2 cm. long; disk flowers yellow, tubular with 4-5 lobes, perfect; pappus none.
Achene terete, 10-ribbed.