A genus that is endemic to New Zealand. Stewart recently determined that Stenostachys gracilis, like Elymus enslyi, has the genomic constitution HW.
See Connor (1994).
| Name | Distribution | Chrom. No. | Genomes |
| Stenostachys deceptorix Connor | New Zealand (South Island) | 28 | HW |
| Elymus enysii [combination in Stenostachys not yet available] | New Zealand (South Island) | 28 | HW |
Stenostachys gracilis (Hooker f.) Connor |
New Zealand (South Island) | 28 | HW |
| Stenostachys laevis (Petrie) Connor | New Zealand (North Island) | 28 | HW |
