Distribution: Occurring on both sides of the Cascades crest in Washington; southwestern British Columbia to California, disjunct in west-central Idaho.
Habitat: Open areas from the valleys and foothills to middle elevations in the mountains
Growth Duration: Perennial
Conservation Status: Not of concern
Robust perennial from a very large, woody taproot, the several ascending, glabrous stems 5-15 dm. tall.
Both basal and cauline leaves large and somewhat roughened, ternate-pinnately dissected into small, narrow ultimate segments up to 1 cm. long.
Inflorescence a compound umbel, the rays 10-30, usually about equal, 4-10 cm. long at maturity; involucre none; involucel of well-developed narrow bractlets; calyx teeth obsolete; flowers brownish-purple or yellow (the two color forms rarely found together), some of them always sterile.
Fruit elliptic, 8-17 mm. long and 4.5-10 mm. wide, the lateral wings narrow and thickened, up to 1 mm. wide, the dorsal ribs inconspicuous.
PNW Herbaria: Specimen records of Lomatium dissectum in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Lomatium dissectum checklist entry.
OregonFlora: Lomatium dissectum information.
E-Flora BC: Lomatium dissectum atlas page.
CalPhotos: Lomatium dissectum photos.
USDA Plants: Lomatium dissectum information.