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ragweed
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ragweed

Annual plant Ambrosia artemisiifolia in the Compositae family, common on roadsides and waste ground throughout North America. It grows to 150 cm/5 ft in height and has long spikes of yellow-green flowers; the great ragweed A. trifida grows to 240 cm/8 ft. Both are wind-pollinated; they produce large quantities of pollen and are a major cause of hay fever.



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