Distribution: Native in the Pacific Northwest, but widely distributed elsewhere as a weed.
Habitat: Waste places and streambanks, especially in sandy soil.
Flowers: August - October
Origin: Native? Disputed native (BC) or introduced (Chambers and Sundberg 2000)
Conservation Status: Not of concern
Coarse, nearly inodorous, glabrous, taprooted annual or biennial, 0.3-3 m. tall.
Leaves 5-15 cm. long, green, pinnately divided nearly to the midrib into several narrow lobes which are again sharply toothed, or the lower bipinnatifid.
Inflorescence dense, spike-like or of short, spike-like branches; heads numerous, crowded, nearly sessile; involucre 2-3 mm. high; corollas all tubular, yellowish, all fertile, the outer pistillate; receptacle naked; pappus none.