Symphyotrichum puniceum
formerly called Aster puniceus    
Purple Stemmed Aster aka Swamp Aster
 
North America

Stout rhizomatous perennial of swamps and wet open areas.
Up to about 9 feet tall
Blue ray flowers
 
Distinguishing feature of this species is its purple stems and clasping leaves.
 
 
 

 

 

 
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