| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Accipitriformes (raptors) | 1 | 0 | 0 |
| Achelia | 2 | 0 | 0 |
| Achelia alaskensis (Cole 1904) | 0 | 0 | 1 |
| Achelia megova (Hilton 1943) | 0 | 0 | 1 |
| Achnanthaceae | 1 | 0 | 0 |
| Achnanthes Bory de Saint-Vincent 1822 | 1 | 0 | 0 |
| Achnanthes longipes C. Agardh 1824 | 0 | 0 | 1 |
| Acila H. Adams & A. Adams 1858 | 1 | 0 | 0 |
| Acila praedivaricata | 0 | 0 | 1 |
| Acinetosporaceae | 1 | 0 | 0 |
| Acipenser | 1 | 0 | 0 |
| Acipenser medirostris Ayres 1854 (Green Sturgeon) | 0 | 0 | 1 |
| Acipenseridae (sturgeons) | 1 | 0 | 0 |
| Acipenseriformes (sturgeons and paddlefishes) | 1 | 0 | 0 |
| Acmaea Eschscholtz 1833 | 1 | 0 | 0 |
