Distribution: Occurring east of the Cascades crest in Washington, where endemic to Chelan and Kittitas counties.
Habitat: Open, rocky slopes and ponderosa pine forest openings, from low to middle elevations.
Flowers: May-June
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Bees, flies, butterflies, beetles, wasps
[none provided]
PNW Herbaria: Specimen records of Lomatium thompsonii in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Lomatium thompsonii checklist entry
OregonFlora: Lomatium thompsonii information
E-Flora BC: Lomatium thompsonii atlas page
CalPhotos: Lomatium thompsonii photos