Centaurea maculosa
Spotted Knapweed aka Star Thistle
Europe

Biennial that is considered a noxious weed particularly of sandy to gravelly soils.
up to 4 feet tall
Purplish-pink, thistle-like flowers
 
 
 
 
 
This species has allelopathic traits which results in a monoculture of spotted knapweed in a particular area over time.

 

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