Meaning : 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
Meaning : 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