Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Wyoming.
Habitat: Common in open woods, balds, and thickets at low to middle elevations in the mountains.
Conservation Status: Not of concern
Taprooted perennial, the single stem branched at the base and upward, 0.5-5 dm. tall.
The lowermost cauline leaves often attached below the ground surface, well-developed and petiolate, the blade ternate-pinnate, 1.5-4 cm. long and 2-3.5 cm. wide, the rachis entire; middle and upper cauline leaves few and reduced, becoming sessile.
Primary umbels few-rayed and irregular, ultimate umbels small and head-like; involucre of leafy bracts, involucel of 6-10, oblong to lance-linear, pointed bracts 1 mm. long; calyx lobes ovate, pointed, 1 mm. long; flowers light yellow; staminate flowers more numerous than the perfect.
Fruit ovoid-globose, 3-5 mm. long and 2-4 mm. wide, covered at least upward with stout, recurved prickles.