| Name | From | To | Age range |
|---|---|---|---|
| Alnus hirsuta | Pliocene | Pleistocene |
|
| Alnus incana | Early Tertiary | Pleistocene |
|
| Alnus incana-glutinosa | Late Pliocene | Late Pliocene |
|
| Alnus incerta | Paleogene | Neogene |
|
| Alnus inopinata | Paleogene | Neogene |
|
| Alnus japonica | Early Tertiary | Neogene |
|
| Alnus jorulensis | Paleogene | Neogene |
|
| Alnus kamtschatica | Oligocene | Middle Pliocene |
|
| Alnus kefersteini | Eocene | Helvetian |
|
| Alnus kefersteinii | Senonian | Late Neogene |
|
| Alnus kireevskiana | Miocene | Miocene |
|
| Alnus maritima | Paleogene | Neogene |
|
| Alnus menzelii | Paleogene | Neogene |
|
| Alnus minuta | Late Campanian | Sarmatian |
|
| Alnus nepalensis | Late Eocene | Late Pliocene |
|
| Alnus nostartum | Late Neogene | Late Neogene |
|
| Alnus opulenta | Paleogene | Neogene |
|