Azolla pinnata

Azolla pinnata
Bacopa amplexicaulis
Bacopa australis
Bacopa caroliniana (lemon bacopa, water hyssop)
Bacopa crenata
Bacopa monnieri (water hyssop)
Bacopa myriophylloides
Bacopa rotundifolia
Baldellia ranunculoides
Barclaya longifolia ...

Azolla caroliniana (A,B2,R,W) "Fairy Moss"
Azolla filiculoides (A,B1,D,R)
Azolla pinnata (A,B2)
Ceratophyllum demersum (A,B1,D,R,S1,S2,W,Y) "Hornwort"
Ceratophyllum submersum (J,B2,D,R,V) ...

See also: Pinna, Aquarium, Water, Limnophila sessiliflora, Java Fern