St. John, L.; Ogle, D.; Shaw, N.L. 2009. Plant guide: Hotrock penstemon (Penstemon deustus Douglas ex Lindl). Aberdeen, ID: U.S. Department of Agriculture, Natural Resources Conservation Service, Aberdeen Plant Materials Center. 3 p.

St. John, L.; Ogle, D.; Shaw, N.L. 2009. Plant guide: Hotrock penstemon (Penstemon deustus Douglas ex Lindl). Aberdeen, ID: U.S. Department of Agriculture, Natural Resources Conservation Service, Aberdeen Plant Materials Center. 3 p.

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