Eupatorium maculatum
The genus of this plant has been recently changed to Eutrochium maculatum
Joe Pye Weed aka Swamp Root
North America

Robust perennial of open to shaded damp thickets, meadows and shorelines.
 
9 to 20 florets per head
 
Coarse leaves 10-12 inches long in whorls about the spotted stems.
 
 
 
 
 

 

 
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