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Centaurea nigra
Centaurea nigra is a species of flowering plant in the daisy family known by the common names Lesser Knapweed, Common Knapweed and Black Knapweed. A local vernacular name is Hardheads. It is native to Europe but it is known on other continents as an introduced species and often a noxious weed.
Spotted on Aug 11, 2012
Submitted on Aug 31, 2013
