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.
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