Distribution: Occurring west of the Cascades crest in Washington; southern British Columbia to California.
Habitat: Grassy balds, prairies, meadows, and open slopes, often at low elevations.
Conservation Status: Not of concern
Perennial from a slender taproot, 1-6 dm. tall.
Leaves chiefly cauline, soft, ternate-pinnately dissected, the ultimate segments crowded, pointed, up to 5 mm. long and less than 1 mm. wide.
Inflorescence a compound umbel, the rays as many as 15, unequal, 2-7 mm. long at maturity; involucre none; bractlets of the involucel well developed, 2-5 mm. long, obovate to elliptic, the tip often shallowly cleft; calyx teeth none; flowers bright yellow; pedicels 2-8 mm. long.
Fruit elliptic, glabrous at maturity, 5-11 mm. long and 3-6 mm. wide, lateral wings about the same width as the body; dorsal ribs slightly raised.