| Name | From | To | Age range |
|---|---|---|---|
| Alnus | Early Triassic | Quaternary |
|
| Alnus alternipora | Maastrichtian | Early Pliocene |
|
| Alnus americana | Oligocene | Oligocene |
|
| Alnus arcuata | Paleogene | Neogene |
|
| Alnus aureus | Cenomanian | Cenomanian |
|
| Alnus barbata | Miocene | Miocene |
|
| Alnus bernesi | Late Neogene | Late Neogene |
|
| Alnus bremanoirensis | Late Paleocene | Early Eocene |
|
| Alnus brenanoirensis | Miocene | Early Pliocene |
|
| Alnus cecropiafolia | Miocene | Pliocene |
|
| Alnus cognita | Paleogene | Neogene |
|
| Alnus compacta | Paleogene | Neogene |
|
| Alnus constans | Paleogene | Neogene |
|
| Alnus cordata | Early Tertiary | Early Tertiary |
|
| Alnus crebrinervis | Late Pannonian | Late Pannonian |
|
| Alnus cremastogyne | Late Neogene | Pleistocene |
|
| Alnus crispa | Late Pliocene | Early Pleistocene |
|