Distribution: Reported from Washington but no specimens seen; Alaska to Oregon, east in scattered locations across North America to the Atlantic Coast.
Habitat: Roadsides, wastelots, and other disturbed open areas where occasinally escaping from cultivation.
Origin: Introduced from Eurasia
Conservation Status: Not of concern
Non-aromatic perennial, 3-10 dm. tall, short-hairy throughout.
Leaves linear, finely serrate, green, sessile and clasping.
Inflorescence open, of several small umbels terminating the branches; involucral bracts imbricate in several series, dry, the margins translucent; rays short, white; disc flowers creamy-white; receptacle convex, chaffy throughout; pappus none.
Achenes compressed parallel to the involucral bracts.