Distribution: Near the Snake and Clearwater Rivers in Idaho, Latah and Nez Perce Counties, Idaho, and Whitman County west to Palouse Falls, Washington.
Habitat: Open, rocky slopes.
Flowers: March - April
Conservation Status: Not of concern
Glabrous perennial from a strongly-thickened taproot, the solitary or several stems usually branched near the base, ascending, 2-6 dm. tall.
Leaves chiefly basal, ternate-pinnately dissected into very numerous small and narrow ultimate segments 1.5-5 mm. long; petiole sheathes very prominent; usually with one or more reduced leaves on the lower stem.
Inflorescence of compound umbels, the rays 5-13, unequal, 3-6 cm. long at maturity; involucre none; involucel bractlets narrow and inconspicuous; calyx teeth none, flowers salmon-colored or salmon-yellow.
Fruit elliptic-oblong to broadly elliptic, 8-14 mm. long, the lateral wings corky-thickened, 0.5-1 mm. wide; dorsal ribs slightly raised, narrower than the intervals.