Ambrosia trifida L.  
Family: Asteraceae
giant ragweed, great ragweed, horse-cane
[Ambrosia integrifolia Muhl. ex Willd., Ambrosia striata Rydb., Ambrosia trifida var. integrifolia L., Ambrosia trifida var. trifida L., Ambrosia variabilis Rydb.]
Ambrosia trifida image
Paul Drobot  
Ambrosia trifida image
Merel R. Black  
Ambrosia trifida image
Robert W. Freckmann  
Ambrosia trifida image
Paul Drobot  
Ambrosia trifida image
Merel R. Black  
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