Hydrocharitaceae

Blyxa aubertii Rich. (Andaman Is.; Assam; Bangladesh; Borneo; Caroline Is.; China South-Central; China Southeast; East Himalaya; Hainan; India; Japan; Jawa; Korea; Louisiana; Madagascar;...

Hydrilla verticillata (L.f.) Royle    

Najas marina L.   

Nechamandra alternifolia (Roxb. ex Wight) Thwaites

  Ottelia alismoides (L.) Pers.                From Floral Database of Tamilnadu :   Binomial...

Vallisneria natans (Lour.) H.Hara   Vallisneria spiralis L.     Vallisneria natans (Lour.) H.Hara ?