Ambrosia artemisifolia
Common Ragweed, Hay Fever Weed, Roman Wormwood
North America

Weed that emerges in large numbers in agricultural i.e. disturbed soils.
 
Inconspicuous.
 
First leaves are opposite but changes to alternate at the 4th node up the stem.
 

 

Generic name, Ambrosia, refers to the food of the gods or anything that tastes or smells delicious. Unfortunately, those terms do not apply to this plant.

 

 
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