Someday this list will be obsolete because there is so many water plants species around the world. Every day every month there would be another new plants species found growing up. It will be much more easy to find some specific water plants through this list.
Anacharis, Elodea, Ditch Moss, Babingtons Curse
Bacopa Carolianana
Myriophylum
Cryptocorynes
Cabomba
Vallisneria, Eel Grass, Tape Grass
Saggitaria, Arrowhead
Madagascar Dwarf Lily, Nymphaea Stellata