Page authors: Don Knoke, David Giblin
Lomatium triternatum
triternate biscuit-root

Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to Oregon, east to Alberta and western Montana.

Habitat: Open hillsides and slopes, forest edge and opening, typically where dry, from low to middle elevations.

Flowers: April-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies, butterflies, beetles, wasps


Perennial from an elongate and slightly thickened taproot, 2-8 dm. tall, the stems solitary or few, erect, covered with fine but stiff hairs.


Leaves chiefly basal or low-cauline, but usually one or more reduced leaves on the middle or upper stem; leaves ternately or ternate-pinnately 2-3 times cleft into long, narrow or broader segments, 1-10 cm. long, highly variable in this feature.


Inflorescence of compound umbels, the rays unequal, 2-10 cm. long at maturity; involucre none, involucel bractlets inconspicuous; calyx teeth none; flowers yellow.


Fruit oblong and narrow, glabrous, 7-15 mm. long and 2-4 mm. wide, the lateral wings less than half the width of the body.

Accepted Name:
Lomatium triternatum (Pursh) J.M. Coult. & Rose
Publication: Contr. U.S. Natl. Herb. 7(1): 227. 1900.

Synonyms & Misapplications:
Lomatium triternatum (Pursh) Coult. & Rose ssp. triternatum [HC, VPBC1]
Lomatium triternatum (Pursh) J.M. Coult. & Rose var. triternatum [HC, IMF3]
Additional Resources:

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

WA Flora Checklist: Lomatium triternatum checklist entry.

OregonFlora: Lomatium triternatum information.

E-Flora BC: Lomatium triternatum atlas page.

CalPhotos: Lomatium triternatum photos.

USDA Plants: Lomatium triternatum information.

59 photographs:
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