| Name | From | To | Age range |
|---|---|---|---|
| Azolla vera | Tertiary | Early Oligocene |
|
| Azolla ventricosa | Tertiary | Piacenzian |
|
| Azolla velus | Late Cretaceous | Thanetian |
|
| Azolla ucrainica | Toarcian | Messinian |
|
| Azolla type 3 | Late Maastrichtian | Late Maastrichtian |
|
| Azolla type 2 | Late Maastrichtian | Late Maastrichtian |
|
| Azolla type 1 | Late Maastrichtian | Late Maastrichtian |
|
| Azolla tymensis | Oligocene | Messinian |
|
| Azolla turgaica | Rupelian | Chattian |
|
| Azolla tuganensis | Oligocene | Messinian |
|
| Azolla tomentosa | Maastrichtian | Zanclian |
|
| Azolla teschiana | Late Cretaceous | Priabonian |
|
| Azolla tertiaria | Miocene | Miocene |
|
| Azolla tegeliensis | Middle Miocene | Pleistocene |
|
| Azolla tanaitica | Toarcian | Messinian |
|
| Azolla tambovica | Toarcian | Langhian |
|
| Azolla sulaensis | Miocene | Miocene |
|