Hygrophila, commonly known as
swampweeds, is a genus of flowering plants in the acanthus family, Acanthaceae. There are about 80 to 100 species, of which many are aquatic plants. The genus is distributed across the tropical and subtropical world. It is one of only two genera in its family that contains aquatic plants, the other being
Justicia. The genus is treated in the tribe
Hygrophileae, which is noted as being in need of revision at the...
(Wikipedia)