Distribution: Yukon Territory to California, east across most of North America to the Atlantic Coast.

Habitat: Moist places at low to middle elevations.

Flowers: June-August

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Bees, flies, beetles, wasps

Robust annual or biennial, 6-20 dm. tall, the juice milky, glabrous except for some hairs on the mid-vein on the underside of the leaves.

Leaves pinnatifid or toothed, 10-40 cm long and 4-20 cm. wide, distributed evenly along the stem.

Heads numerous in a rather narrow, elongate inflorescence, 13-34 flowered; involucre 10-14 mm. high, cylindric but broadening at the base, the bracts imbricate; corollas all ligulate, bluish to white, the tube more than half as long as the ligule; pappus of light brown capillary bristles.

Achenes 4-5.5 mm. long, compressed and thin-edged, nearly beakless.