Page authors: Don Knoke, David Giblin
Lomatium tuberosum
Hoover's biscuit-root, Hoover's lomatium, potato desert-parsley

Distribution: Occurring east of the Cascades crest in central Washington, where endemic to Benton, Grant, Kittitas, and Yakima counties. Scattered locations in Yakima County, Washington, and adjacent counties.

Habitat: Rocky slopes and talus fields at middle elevations .

Flowers: March-April

Origin: Native

Growth Duration: Perennial

Conservation Status: Sensitive in Washington (WANHP)

Pollination: Bees, flies, butterflies, beetles, wasps


Scapose, glabrous and glaucous perennial from a tuberous-thickened root, the scape erect, 1-3 dm. tall.


Leaves all basal, ternate-pinnately dissected into numerous, small, crowded, blunt ultimate segments 2-8 mm. long; bladeless basal sheathes very large and conspicuous, but the remnants from previous year not prominent.


Inflorescence a compound umbel, the rays 5-13, up to 8 cm. long at maturity; involucre none; involucel of a few narrow, inconspicuous bractlets; flowers mustard yellow, becoming reddish with age. Hitchcock et. al. incorrectly refers to the flower color as purple.


Fruit elliptic-oval, reddish along the wings, 9-11 mm. long, the lateral wings thickened and less than 1 mm. wide.

Accepted Name:
Lomatium tuberosum Hoover
Publication: Leafl. W. Bot. 4: 39. 1944.

Synonyms & Misapplications:
(none provided)
Additional Resources:

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

WA Flora Checklist: Lomatium tuberosum checklist entry.

OregonFlora: Lomatium tuberosum information.

E-Flora BC: Lomatium tuberosum atlas page.

CalPhotos: Lomatium tuberosum photos.

USDA Plants: Lomatium tuberosum information.

33 photographs:
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