Distribution: Introduced in most of the United States; chiefly east of the Cascades in Washington and Oregon
Habitat: Noxious weed of dry, disturbed areas
Flowers: July - September
Conservation Status: Not of concern
Annual or biennial, 2-8 dm. tall, thinly white-woolly throughout, the stem winged.
Basal leaves lyrate and pinnatifid, up to 20 cm. long and 5 cm. wide; cauline leaves smaller, becoming linear and entire upward.
Heads several, broader toward the base; involucre 10-15 mm. high, its middle and outer bracts spine-tipped, the larger spines 11-22 mm. long; flowers yellow; pappus of the outer flowers wanting, that of the others 3-5 mm. long; receptacle densely bristly.