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Centaurea nigra

Biological Category 
Species Type 
Other Herbaceous
LHPrism Status 
Tier 4 - Widespread

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Impacts of this species 

Black knapweed is considered an aggressive weed, invading disturbed areas, roadsides, and meadows and fields. A hybrid of Black knapweed and Brown knapweed is fertile and widespread in the northeastern United States.