aristolochia sipho

from The Collaborative International Dictionary of English v.0.48

Pipevine \Pipe"vine`\, n. (Bot.)
   Any climbing species of {Aristolochia}; esp., the Dutchman's
   pipe ({Aristolochia sipho}). See under {Dutchman}.
   [Webster 1913 Suppl.]

from The Collaborative International Dictionary of English v.0.48

Dutchman's-pipe \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}.
        [1913 Webster + WordNet 1.5]