Distribution: Occurring in the eastern portion of Washington; widely distributed throughout North America except for Alaska and far northern Canada.
Habitat: Waste ground.
Conservation Status: Not of concern
Monoecious perennial from creeping rhizomes, 1-10 dm. tall.
Leaves opposite below and alternate above, usually pinnatifid, lance-ovate or elliptic in outline, 3-10 cm. long, sub-sessile.
Staminate heads small, numerous, short-pedunculate, in an open inflorescence of several spike-like flowering shoots arising from the upper leaf axils; pistillate heads borne below, in the leaf axils; fruiting involucre a short-beaked bur, 3-5 mm. long, with a few rounded projections.