Distribution: Canyons of the Snake and lower Salmon Rivers, eastern Oregon and western Idaho.
Habitat: Open slopes.
Conservation Status: Threatened in Washington (WANHP)
Sparingly-branched perennial from a short taproot, 2-7 dm. tall.
Leaves cauline and basal, irregularly pinnately dissected into unequal narrow segments up to 1 cm. long. Taproot short, tuberous-thickened or with 2 or more globose-thickened portions.
Inflorescence of compound umbels, the rays 3-7 cm. long at maturity; involucre none; involucel of inconspicuous, narrow bractlets; calyx teeth obsolete, flowers yellow; pedicels 4-10 mm. long.
Fruit glabrous, elliptic, 5-8 mm. long, the lateral wings well-developed, but barely as wide as the body.