A plant in the morning glory family, Operculina turpethum (syn. Ipomoea turpethum) is known commonly as turpeth, fue vao, and St. Thomas lidpod.

It is perennial herbaceous, hairy vines growing 4 to 5 meter in length, endemic to India. It is commonly found in North Circars and Deccan region up to 3000 ft. The leaves are alternate, very variable in shape, ovate, oblong and truncate or cordate at the base. The flowers are large, axillary and solitary. Fruit is a capsule with conspicuous enlarged sepals and thickened pedicles.