dutchman's-pipe

from The Century Dictionary.

• noun The plant Aristolochia Sipho, a climber with broad handsome foliage: so called from the shape of the flowers. See cut under Aristolochia.

from the GNU version of the Collaborative International Dictionary of English.

• noun 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun hardy deciduous vine having large leaves and flowers with the calyx tube curved like the bowl of a pipe