Operculina turpethum is a species of plant in the morning glory family, known commonly as turpeth, fue vao, and St. Thomas lidpod. It is perennial, herbaceous, and hairy vine growing 4 to 5 meters in length, endemic to India. It is commonly found in the North Circars and Deccan region up to 3000 ft. It is a source of a drug known as turpeth or Indian jalap. Root and root bark are cathartic and laxative. The tuberous roots are also efficacious in dropsy, melancholia, gout, leprosy, rheumatism, and paralysis.