physostigma

from The Century Dictionary.

• noun A genus of leguminous plants of the tribe Phaseoleæ and subtribe Euphaseoleæ, characterized by the spiral keel and by the continuation of the bearded style above the stigma into a large and oblique hollow hood.

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

• noun African woody vines: calabar beans