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{{SPlantbox
|genus=Ambrosia
|Temp Metric=°F
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Ambrosia (a classical name). Compositae. About fifteen species of weedy evil-smelling herbs, mostly American. The common ragweed is A. artemisiaefolia, Linn. The kingweed of western wheatfields, and also of low waste places, is A. trifida, Linn. Probably none is cultivated, the listed Ambrosia mexicana probably being of some other genus, very likely an artemisia.
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{{Taxobox
{{Taxobox
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'''Ragweeds''' (''Ambrosia'') is a genus of flowering plants from the sunflower family ([[Asteraceae]]).
'''Ragweeds''' (''Ambrosia'') is a genus of flowering plants from the sunflower family ([[Asteraceae]]).
The name of this genus is derived from the Greek word for "food of the gods".
The name of this genus is derived from the Greek word for "food of the gods".
They occur in [[temperate]] regions of the northern hemisphere and South America. They prefer dry, sunny grassy plains; sandy soils; and to grow along [[river]] banks, along roadsides, disturbed soils, vacant lots and ruderal sites. Ragweed was far less common in the Eastern United States before dense European settlement/agriculture in the late 1700s.
They occur in [[temperate]] regions of the northern hemisphere and South America. They prefer dry, sunny grassy plains; sandy soils; and to grow along [[river]] banks, along roadsides, disturbed soils, vacant lots and ruderal sites. Ragweed was far less common in the Eastern United States before dense European settlement/agriculture in the late 1700s.