Ogle, D.G.; Peterson, J.S. 2003. Eaton’s penstemon Penstemon eatonii Gray. Boise, ID: U.S. Department of Agriculture, Natural Resources Conservation Service, Idaho State Office. 4 p.

Ogle, D.G.; Peterson, J.S. 2003. Eaton’s penstemon Penstemon eatonii Gray. Boise, ID: U.S. Department of Agriculture, Natural Resources Conservation Service, Idaho State Office. 4 p.

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