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spotted knapweed (Centaurea biebersteinii)

UWSP

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spotted knapweed (Centaurea biebersteinii; COMPOSITE FAMILY [Asteraceae])  An introduced 1-4 tall perennial or biennial herb of dry disturbed sites.  Stiff, wiry stems bear sparse grey-green alternate, pinnately lobed leaves.  Upper stems terminate in attractive 1 wide pink to purple flower heads subtended by distinctive black-tipped bracts.  Flowers mid-summer into fall.  Foliage and roots exude toxins that can kill neighboring plants.  Native to Eastern Europe, but ecologically invasive in our area.  [106]

 

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