vigna caracalla

Noun

• 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

Related words

• Synonyms: 
  snailflower , snail-flower , snail flower , snail bean , corkscrew flower , Vigna caracalla , Phaseolus caracalla