Hygrophila madurensis

Hygrophila madurensis is a critically endangered aquatic plant in the family Acanthaceae. It is endemic to Nallakulam in the Alagar Hills of the Eastern Ghats in Madurai district, Tamil Nadu, India.
"Balakrishnan and Subramaniam (1958)" described the genus "Santapaua" with only one species, namely "S. madurensis". "Karthikeyan and Moorthy (2010)" merged the genus Santapaua with Hygrophila giving this species the name, "Hygrophila madurensis".