aristolochia durior(n = noun.plant) aristolochia macrophylla, dutchman's-pipe, pipe vine - hardy deciduous vine having large leaves and flowers with the calyx tube curved like the bowl of a pipe;
is a kind of aristolochia clematitis, birthwort

aristolochia, aristolochia clematitis, aristolochia macrophylla, aristolochia serpentaria, genus aristolochia