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