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Keywords from Image Description:
Centaurea diffusa APHIS. en Centaurea diffusa Lam diffuse knapweed invasive org cfm num Invasive org Image Number diffuse knapweed Centaurea diffusa Lam USDA APHIS PPQ Archive USDA Animal and Plant Health Inspection Service APHIS PPQ Bugwood org You must attribute the work in the manner specified but not in any way that suggests