snail-flower

snail-flower
    n 1: perennial tropical American vine cultivated for its racemes
         of showy yellow and purple flowers having the corolla keel
         coiled like a snail shell; sometimes placed in genus
         Phaseolus [syn: {snailflower}, {snail-flower}, {snail
         flower}, {snail bean}, {corkscrew flower}, {Vigna
         caracalla}, {Phaseolus caracalla}]