| ×Elyhordeum montanense (Scribn. ex Beal) Bowden | | a | | Elyhordeum montanense (Scribn. ex Beal) Bowden | | 102503 | |
| ×Elyhordeum spp. | | a | | Elyhordeum spp. | | 317401 | |
| ×Elyhordeum macounii (Vasey) Barkworth & D. R. Dewey | | a | | Elyhordeum macounii (Vasey) Barkworth & D. R. Dewey | | 317402 | |
| ×Elyhordeum dutillyanum (Lepage) Bowden | ×Leydeum dutillyanum (Lepage) Barkworth | | | Elyhordeum dutillyanum (Lepage) Bowden | Leydeum dutillyanum (Lepage) Barkworth | 412703 | 454288 |
| ×Elyhordeum piperi (Bowden) Bowden | ×Leydeum piperi (Bowden) Barkworth | | | Elyhordeum piperi (Bowden) Bowden | Leydeum piperi (Bowden) Barkworth | 412704 | 454287 |