Page authors: Don Knoke, David Giblin
Lomatium laevigatum
smooth biscuit-root, slickrock desert-parsley, smooth lomatium

Distribution: Occurring east of the Cascades crest in south-central Washington; south-central Washington to adjacent Oregon.

Habitat: Crevices is basalt cliffs.

Flowers: April

Origin: Native

Growth Duration: Perennial

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.

Accepted Name:
Lomatium laevigatum (Nutt.) J.M. Coult. & Rose
Publication: Contr. U.S. Natl. Herb. 7(1): 225. 1900.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Lomatium laevigatum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Lomatium laevigatum checklist entry.

E-Flora BC: Lomatium laevigatum atlas page.

CalPhotos: Lomatium laevigatum photos.

USDA Plants: Lomatium laevigatum information.

35 photographs:
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