po·lyg·o·num /pəˈlɪgənəm/
  蓼屬
  Po·lyg·o·num n.  Bot. A genus of plants embracing a large number of species, including bistort, knotweed, smartweed, etc.
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  Polygonum
       n : diverse genus of herbs or woody subshrubs of north temperate
           regions [syn: genus Polygonum]