| Name | From | To | Age range |
|---|---|---|---|
| Azolla schopfi | Cretaceous | Paleocene |
|
| Azolla schopfii | Paleocene | Paleocene |
|
| Azolla siberica | Oligocene | Oligocene |
|
| Azolla sibirica | Rupelian | Chattian |
|
| Azolla simplex | Berriasian | Campanian |
|
| Azolla sp | Dogger | Pleistocene |
|
| Azolla sp. Li,1997 | Late Maestrichtian | Late Maestrichtian |
|
| Azolla sp. Papu,1988 | Late Cretaceous | Late Cretaceous |
|
| Azolla sp. Ruiz & Quat.,1997 | Maastrichtian | Paleocene |
|
| Azolla sp.1 | Maastrichtian | Maastrichtian |
|
| Azolla sp.2 | Maastrichtian | Maastrichtian |
|
| Azolla sp.A | Campanian | Early Oligocene |
|
| Azolla sp.B | Late Miocene | Late Miocene |
|
| Azolla stanleyi | Paleocene | Middle Eocene |
|
| Azolla stanleyii | Maastrichtian | Maastrichtian |
|
| Azolla suchorukovii | Oligocene | Chattian |
|
| Azolla sulaensis | Miocene | Miocene |
|