Holmgren, N.H. 1979. New Penstemons (Scrophulariaceae) from the Intermountain Region. Brittonia. 31(2): 217-242.

Holmgren, N.H. 1979. New Penstemons (Scrophulariaceae) from the Intermountain Region. Brittonia. 31(2): 217-242.

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