Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern Washington to the Hells Canyon area of Oregon and Idaho.
Habitat: Dry, open, often rocky slopes from lowland valleys to the montane.
Conservation Status: Sensitive in Washington (WANHP)
Glabrous, acaulescent, parsley-scented perennial from a stout taproot and branching, woody base, 1.5-4 dm. tall.
Leaves bright green, ternate-pinnately dissected into moderately numerous, small, flat ultimate segments 1-6 mm. long and up to 2.5 mm. wide, the segments tending to lie in the same plane.
Inflorescence of compound umbels, the rays unequal, 2-8 cm. long at maturity; involucre wanting; involucel of several well-developed, narrow bractlets; calyx teeth none; flowers yellow; pedicels 3-15 mm. long.
Fruit elliptic, 5.5-10 mm. long, glabrous, the lateral wings one-half as wide to as wide as the body.