Ageratina altissima (L.) R. M. King & H. Rob.  
Family: Asteraceae
White Snakeroot
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John Hilty  
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Taken from Nesom, Guy L. "Ageratina" in Flora of North America, Vol. 21, p. 549. Oxford University P  
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John Hilty  
Ageratina altissima image
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The National Science Foundation
This project made possible by National Science Foundation Award 1410069