Adobe Hills Beardtongue (Penstemon retrorsus Payson ex Pennell)
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↑Links & External Resources
• Penstemon retrorsus (Adobe Hills beardtongue) | USDA PLANTS Database (About This Site)
• Penstemon retrorsus | Biota of North America Project (BONAP) (About This Site)
• Penstemon retrorsus Payson | Plants of the World Online (POWO) (About This Site)
• Penstemon retrorsus | NatureServe Explorer (About This Site)
• Penstemon retrorsus | Flora of North America (About This Site)