Distribution: Occurring in scattered locations in Washington; native to southeastern U.S., but introduced in scattered localities in central and western U.S.
Habitat: Roadsides and waste areas, riparian zones, tolerant of alkaline.
Origin: Introduced from southern North America and tropical America
Growth Duration: Annual
Conservation Status: Not of concern
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.