Ambrosia trifida
Giant Ragweed aka Kinghead, Bitterweed, Crown Weed, Great Ragweed, Kingweed, Wild Hemp and Tall Ambrosia.
North America

Tall annual of fertile, moist farm fields and waste lands.
 
 
 
 
 

 

Far outranks other species of ragweed as a cause for hay fever.

 

 
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