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ragweed, ragwort, tansy ragwort, benweed, Senecio jacobaea | widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity | |
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ambrosia, ragweed, bitterweed | any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma |