True Aquatic Plants?

[mike455555]

how many different types of true aquatic plants are out there?

i know that alot of plants can be grown out of water, well most can, but how many can only be grown in water?

list of plants i know only to grow in water:

stem plants:
blyxa japonica

bulb plants:
tiger lotus
lillys
aponogeton


list of plants i know to be grown out of water:
stem plants:
HC
staurogyne repens
Pogostemon helferi
star grass, and its varivitys
grass's, all of them
hair grass
microchain sword
ect
other:
anubias
java fern
amazon sword

my question is, what other plants can be only grown in water?

 

[Ps3Steveo]

Vallis

 

[mike455555]

i knew that one as well but i forgot to add it, any others?

 

[Ps3Steveo]

Erm, dunno lol.