Tyrol Knapweed
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| Centaurea nigrescens | ||||||||||||||||
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 Tyrol Thistle
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| Centaurea nigrescens Willd. |
Tyrol knapweed (Centaurea nigrescens) is a perennial plant of the star thistle genus that grows natively in Central and South-Eastern Europe (from Southern Germany and Northern Italy to Romania and Bulgaria), but has also been introduced and is now a noxious weed in the Northern United States, Canada and Southern Australia. It has purple flowers and it flowers in the summer (June to September).
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