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  
<noun.plant>
<noun.plant>
| Phaseolus caracalla |   | 
| Vigna caracalla |   | 
| corkscrew flower |   | 
| snail bean |   | 
| snail flower |   | 
| snail-flower |   | 
| snailflower |   | 
