Distribution: East of the Cascades in Washington; British Columbia south to California, east to North Dakota, Wyoming and Utah.
Habitat: Open, dry, rocky areas at low elevations.
Conservation Status: Not of concern
Puberulent perennial from a taproot and simple, subterranean crown, 1-3 dm. tall.
Leaves gray-green, basal, ternate-pinnately or merely pinnately dissected into segments up to 9 mm. long and 2 mm. wide. Taproot strongly thickened throughout, or slender above, elongate-tuberous below.
Inflorescence a compound umbel, the rays 2-6 cm. long at maturity; peduncles usually several from the base, ascending in flower and upright in fruit, 1-2.5 dm. long; involucre none; involucel of narrow, conspicuous, green bractlets, often surpassing the flowers; calyx teeth obsolete; flowers grayish-white or purplish-white, rarely yellowish; pedicels 1-11 mm. long.
Fruit narrow, oblong, 10-20 mm. long, glabrous to puberulent, the marginal wings narrow to fairly broad.