Appalachian Mountainmint (Pycnanthemum flexuosum (Walter) Britton, Sterns & Poggenb.)
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• Pycnanthemum flexuosum (Appalachian mountainmint) | USDA PLANTS Database (About This Site)
• Pycnanthemum flexuosum | Biota of North America Project (BONAP) (About This Site)
• Pycnanthemum flexuosum (Walter) Britton, Sterns & Poggenb. | Plants of the World Online (POWO) (About This Site)
• Pycnanthemum flexuosum | NatureServe Explorer (About This Site)