Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, east to Idaho and Nevada, widespread from the U.S. midwest to the Atlantic Coast.
Habitat: Roadsides, forest edge, thickets, fields, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Conservation Status: Not of concern
Pubescent annual, the stiff stems 3-6 dm. tall.
Leaves alternate, petiolate, narrowly triangular in outline, two or three times pinnate, the ultimate segments narrowly lanceolate.
Inflorescence of compound umbels, with few to several rays; involucre bracts 0-1; flowers white, the 5 petals somewhat unequal, styles 2.
Fruit ovoid, with straight bristles along the ribs.