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Craig C. Freeman +
unknown +
Colo. +, N.Mex. +  and Wyo. +
1500–2900 m. +
Rocky or gravelly soils, shortgrass prairies, foothills, mesas, parklands. +
Flowering May–Jul. +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
Penstemon unilateralis +
Penstemon secundiflorus var. secundiflorus +
Penstemon secundiflorus +
variety +