Distribution: Occurring east of the Cascades crest, where endemic to Chelan and Douglas counties in Washington.
Habitat: Common on dry, grassy hillsides just below the ponderosa pine woodlands.
Flowers: May-June
Origin: Native
Growth Duration: Perennial
Conservation Status: Threatened in Washington (WANHP)
Pollination: Bumblebees, bees, butterflies, flies
[none provided]
PNW Herbaria: Specimen records of Trifolium thompsonii in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Trifolium thompsonii checklist entry
OregonFlora: Trifolium thompsonii information
E-Flora BC: Trifolium thompsonii atlas page
CalPhotos: Trifolium thompsonii photos