Distribution: Along the Columbia River in Klickitat County, Washington, and adjacent Oregon.
Habitat: Crevices is basalt cliffs.
Conservation Status: Threatened in Washington (WANHP)
Glabrous perennial from a stout taproot and branching, woody base, 2.5-4 dm. tall.
Leaves basal, ternate-pinnately dissected into linear segments 1-2 mm. wide and 1-3 cm. long.
Inflorescence a compound umbel, the rays unequal, 3-5 cm. long; involucre none; involucel wanting or inconspicuous; pedicels 4-10 mm. long; calyx teeth obsolete; flowers yellow.
Fruit glabrous, elliptic, 7-12 mm. long, the wings to wholly as wide as the body.