Ageratina altissima (L.) R. M. King & H. Rob.  
Family: Asteraceae
White Snakeroot
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John Hilty  
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John Hilty  
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Gretchen Jones @ http://pollen.usda.gov/index.htm  
Ageratina altissima image
Taken from Nesom, Guy L. "Ageratina" in Flora of North America, Vol. 21, p. 549. Oxford University P  
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G.A. Cooper @ USDA-NRCS PLANTS Database  
Ageratina altissima image
G.A. Cooper @ USDA-NRCS PLANTS Database  
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