St. John, L.; Tilley, D.; Ogle, D. 2011. Plant guide: Firecracker penstemon (Penstemon eatonii). Aberdeen, ID: U.S Department of Agriculture, Natural Resources Conservation Service, Plant Materials Center. 4 p.

St. John, L.; Tilley, D.; Ogle, D. 2011. Plant guide: Firecracker penstemon (Penstemon eatonii). Aberdeen, ID: U.S Department of Agriculture, Natural Resources Conservation Service, Plant Materials Center. 4 p.

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