Distribution: Willamette Valley of Oregon from near Salem to near Eugene.
Habitat: Low, moist ground.
Conservation Status: Endangered in Washington (WANHP)
Glabrous, acaulescent perennial from a long, slender taproot, 2-6.5 dm. tall.
Leaves ternate-pinnately dissected into linear or filiform segments 3-10 mm. long and up to 1 mm. wide.
Inflorescence a compound umbel, the rays unequal, 4-13 mm. long; with usually only 2-5 fertile flowers; involucre wanting; bractlets of the involucel ternately or bi-ternately divided; calyx teeth obsolete, flowers yellow.
Fruit glabrous, 8-13 mm. long and 5-7 mm. wide, the corky-thickened lateral wings half as wide as and the same color as the body.