Torenia bicolor

About

Torenia bicolor, the two-color wishbone flower, is an annual herb found in the western and southern India as well as the Andaman Islands, where it grows mainly in moist and waterlogged areas. The plant has slender, four-sided stems with small hairs near the nodes. Leaves are small, triangular to oval in shape, with toothed edges and a pointed tip, and are carried on short stalks.

Summary from Wikipedia