Distribution: Pacific Northwest to California, and throughout the Southern States; chiefly west of the Cascades in Washington
Habitat: Dry, open areas at low elevations
Flowers: May - July
Conservation Status: Not of concern
Slender, single-stemmed annual from a slender taproot, 0.5-6 dm. tall, with short, stiff, blunt bristles throughout.
Leaves 3-pinnate, long petiolate, the blades 3-10 cm. long and 1.5-7 cm. wide, the ultimate segments linear, 1-5 mm. long and 0.5-1 mm. wide.
Involucral bracts pinnatifid into linear segments up to 8 mm. long; bractlets of the involucel linear and entire, about equaling the pedicels; inflorescence 1-4 cm. wide, the rays up to 4 cm. long; ultimate umbellets with 5-12 white flowers.
Fruit oblong, 3-5 mm. long and 2 mm. wide, broadest below the middle, with prickles and bristles on the ribs.