Lomatium dissectum
fern-leaved biscuit-root, sessile-fruited fern-leaved biscuit-root, fern-leaved desert parsley, fern-leaved lomatium

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

Flowers: April-June

Origin: Native

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.

Accepted Name:
Lomatium dissectum (Nutt.) Mathias & Constance
Publication: Bull. Torrey Bot. Club 69: 246. 1942.

Synonyms & Misapplications:
Leptotaenia dissecta Nutt.
Leptotaenia foliosa var. dissecta
Lomatium dissectum (Nutt.) Mathias & Constance var. dissectum [HC, VPBC1]
Additional Resources:

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.

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