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By Cheryl Powell
Beacon Journal medical writer
Ragweed is a flowering plant in the genus Ambrosia in the sunflower family Asteraceae. Most cases of hay fever are caused by allergies to ragweed. (AP file photo)
Ragweed pollen in seen this file photo. The flowering plant (MCT file photo)
Ragweed grows in a Missouri field. Most cases of hay fever are caused by allergies to this flowering plant. (MCT file photo)
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