wood·ruff /ˈwʊd(ˌ)rəf/
  車葉草
  Wood·ruff Wood·roof n.  Bot. A little European herb (Asperula odorata) having a pleasant taste. It is sometimes used for flavoring wine.  See Illust. of Whorl.
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  woodruff
       n 1: Old World fragrant stoloniferous perennial having small
            white flowers and narrow leaves used as flavoring and in
            sachets; widely cultivated as a ground cover; in some
            classifications placed in genus Asperula [syn: sweet
            woodruff, waldmeister, fragrant bedstraw, Galium
            odoratum, Asperula odorata]
       2: any plant of the genus Asperula