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• Centaurea nigra L. - Common Knapweed

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© Fiona McCrory

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(Map updated: March 2008)

A very common pernnial of grassy places; tall (up to about 2 feet) with blue thistle-like flower heads and narrow-oval leaves.

All names: Centaurea nigra L.; Centaurea nemoralis Jordan; Centaurea nigra ssp. nemoralis (Jordan) Gremli; Centaurea dedeauxii ssp. nemoralis (Jordan) Dostal; Centaurea obscura Jord.