Dutchman's-pipe n. a hardy deciduous American vine (Aristolochia durior) having large, heart-shaped leaves and bearing brownish-purple flowers which have their calyx tubes curved like the bowl of a tobacco pipe.  Formerly classified as Aristolochia Sipho.
  Syn: -- pipe vine, Aristolochia macrophylla, Aristolochia durior.
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  Aristolochia macrophylla
       n : hardy deciduous vine having large leaves and flowers with
           the calyx tube curved like the bowl of a pipe [syn: Dutchman's-pipe,
            pipe vine, Aristolochia durior]