Wig Knapweed (Centaurea phrygia L.)
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• Centaurea phrygia (wig knapweed) | USDA PLANTS Database (About This Site)
• Centaurea phrygia | Go Botany (About This Site)
• Centaurea phrygia | CABI Invasive Species Compendium (About This Site)
• Centaurea phrygia | Biota of North America Project (BONAP) (About This Site)
• Centaurea phrygia L. | Plants of the World Online (POWO) (About This Site)
• Centaurea phrygia | NatureServe Explorer (About This Site)
• Centaurea phrygia | Flora of North America (About This Site)