Ogle, D.; Peterson, J.S. 2000. Plant guide: Thickleaf penstemon (Penstemon pachyphyllus Gray ex Rydb.). Aberdeen, ID: U.S. Department of Agriculture, Natural Resources Conservation Service. 4 p.

Ogle, D.; Peterson, J.S. 2000. Plant guide: Thickleaf penstemon (Penstemon pachyphyllus Gray ex Rydb.). Aberdeen, ID: U.S. Department of Agriculture, Natural Resources Conservation Service. 4 p.

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