Washington Beardtongue (Penstemon washingtonensis D.D. Keck)
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↑Links & External Resources
• Penstemon washingtonensis (Washington beardtongue) | USDA PLANTS Database (About This Site)
• Washington Beardtongue | iNaturalist (About This Site)
• Penstemon washingtonensis | Biota of North America Project (BONAP) (About This Site)
• Penstemon washingtonensis D.D.Keck | Plants of the World Online (POWO) (About This Site)
• Penstemon washingtonensis | NatureServe Explorer (About This Site)
• Penstemon washingtonensis | Flora of North America (About This Site)