| Name | From | To | Age range |
|---|---|---|---|
| Azolla circinata | Cretaceous | Paleocene |
|
| Azolla caroliniana | Paleocene | Paleocene |
|
| Azolla capricornica | Eocene | Late Eocene |
|
| Azolla bulbosa | Cretaceous | Thanetian |
|
| Azolla borysthenica | Aquitanian | Langhian |
|
| Azolla bohemica | Eocene | Miocene |
|
| Azolla berryi | Eocene | Eocene |
|
| Azolla barbata | Cretaceous | Recent |
|
| Azolla aspera | Tertiary | Piacenzian |
|
| Azolla areolata | Danian | Priabonian |
|
| Azolla antiqua | Lutetian | Chattian |
|
| Azolla anglica | Paleocene | Early Eocene |
|
| Azolla aglochidia | Middle Oligocene | Messinian |
|
| Azolla agittifera | Late Cretaceous | Late Cretaceous |
|
| Azolla africana | Early Miocene | Early Miocene |
|
| Azolla | Givetian | Recent |
|