| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| × Agropogon | 1 | 0 | 1 |
| Elyhordeum (barley) | 1 | 4 | 1 |
| Elyhordeum macounii (Vasey) Barkworth & D. R. Dewey () | 0 | 4 | 0 |
| Aa | 5 | 0 | 1 |
| Aa calceata (Rchb. fil.) Schltr. | 0 | 0 | 0 |
| Aa colombiana Schltr. | 0 | 0 | 0 |
| Aa hartwegii Garay | 0 | 0 | 0 |
| Aa leucantha (Rchb. fil.) Schltr. | 0 | 0 | 0 |
| Aa paleacea (Kunth) Rchb. fil. | 0 | 0 | 0 |
| Aaaba fossicollis (Kerremans 1903) | 0 | 0 | 0 |
| Aaroniella | 0 | 0 | 0 |
| Aaroniella | 1 | 13 | 0 |
| Aaroniella badonneli (Danks & L. 1950) | 0 | 4 | 0 |
| Aaroniellinae | 0 | 0 | 1 |
| Aaronsohnia | 1 | 0 | 1 |
