| 1. ragweed [ Synonyms: benweed, ragwort, senecio jacobaea, tansy ragwort] | |
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Widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
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| 2. ragweed [ Synonyms: ambrosia, bitterweed] | |
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Any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
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