rag·wort /-ˌwɝt, ˌwɔrt/
 劉寄奴屬植物
 Rag·wort n. Bot. A name given to several species of the composite genus Senecio.
 Note: ☞ Senecio aureus is the golden ragwort of the United States; Senecio elegans is the purple ragwort of South Africa.
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 ragwort
      n 1: widespread European weed having yellow daisylike flowers;
           sometimes an obnoxious weed and toxic to cattle if
           consumed in quantity [syn: tansy ragwort, ragweed, benweed,
            Senecio jacobaea]
      2: American ragwort with yellow flowers [syn: butterweed, Senecio
         glabellus]