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Eupatorium cannabinum
http://www.botanical.com/botanical/mgmh/a/agrim016.html
short description and medicinal uses
Eupatorium perfoliatum
http://www.botanical.com/botanical/mgmh/b/bonese65.html
short description and medicinal uses
Eupatorium sordidum
http://florawww.eeb.uconn.edu/acc_num/198500451.html