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.

• 热带美洲一种多年生藤本植物，有时由于美丽的总状花序的紫色和黄色而栽培，花冠的龙骨瓣盘卷像一个蜗牛的壳。