Potentilla thurberi var. atrorubens
J. Wash. Acad. Sci. 29: 481. 1939.
Leaflets: teeth apex acute, abaxial surfaces ± white to white, straight hairs usually dense on veins, cottony hairs sparse to dense.
Phenology: Flowering summer.
Habitat: Dry grassy slopes, moist meadows and forests, oak and conifer woodlands
Elevation: 1800–2900 m
Ariz., N.Mex., Mexico (Chihuahua), Mexico (Sonora)
"dm" is not declared as a valid unit of measurement for this property.