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Possible definitions for oarweed
ragweed
Any of about 15 species of weedy plants (see weed) that make up the genus Ambrosia in the composite family, most of which are native to N. America. They have rough hairy stems, mostly lobed or divided leaves, and inconspicuous greenish flowers borne in small heads. Common ragweed (A. artemisiifolia) is found across N. America. Pollen shed by ragweeds in great abundance in late summer is the principal cause of hay fever in E and middle N. America. Since ragweeds are annuals, mowing before pollination season eradicates them.
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