Distribution: Occurring on both sides of the Cascades crest in Washington; Washington to California, east to the southern Rocky Mountains; native from the Great Plains to the Atlantic Coast.

Habitat: Roadsides and waste areas, riparian zones, tolerant of alkaline.

Flowers: July-November

Origin: Introduced from southern North America and tropical America

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Wind

Glandular and strongly aromatic annual or short-lived perennial, simple to freely-branched, erect, up to 1 m. tall, covered with sessile yellow glands and often pubescent.

Leaves alternate, the blades rhombic-ovate to lanceolate, up to 10 cm. long, strongly wavy-pinnatifid to wavy-dentate, narrowed to short, slender petioles, gradually reduced and often entire and bract-like above.

Flowers sessile and glomerate in small spikes borne in panicles in the leaf axils; perianth glabrous, 5-lobed over half the length; stamens 5, opposite the perianth lobes; styles 2.

Seed 1, lenticular, horizontal, 0.8 mm. in diameter.