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 ag·er·a·tum /ˌæʤəˈretəm/
 霍香

 A·ger·a·tum prop. n.  Bot. A genus of plants, one species of which (Ageratum Mexicanum) has lavender-blue flowers in dense clusters.
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 ageratum
      n 1: rhizomatous plant of central and southeastern United States
           and West Indies having large showy heads of clear blue
           flowers; sometimes placed in genus Eupatorium [syn: mistflower,
            mist-flower, Conoclinium coelestinum, Eupatorium
           coelestinum]
      2: any plant of the genus Ageratum having opposite leaves and
         small heads of blue or white flowers