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21b. Potentilla thurberi A. Gray var. atrorubens (Rydberg) Kearney & Peebles, J. Wash. Acad. Sci. 29: 481. 1939.
Potentilla atrorubens Rydberg, Bull. Torrey Bot. Club 24: 11, plate 288. 1897
Leaflets: teeth apex acute, abaxial surfaces ± white to white, straight hairs usually dense on veins, cottony hairs sparse to dense.
Flowering summer. Dry grassy slopes, moist meadows and forests, oak and conifer woodlands; 1800–2900 m; Ariz., N.Mex.; Mexico (Chihuahua, Sonora).
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