Elymus is a genus of perennial plants with approximately 150 species in the grass family, related to rye, wheat, and other widely grown cereal grains. Elymus is a cosmopolitan genus, represented by species across all continents of the world. Common names include couch grass, wildrye and wheatgrass.

Species

, Plants of the World Online accepted 173 species and 19 hybrids: Elymus multisetus (J.G.Sm.) Burtt Davy

Older classifications

Many species once considered members of Elymus are now regarded as better suited to other genera: Agropyron, Anthosachne, Brachypodium, Cenchrus, Crithopsis, Heteranthelium, Jouvea, Kengyilia, Leymus, Psathyrostachys, Stenostachys, Taeniatherum, Thinopyrum etc.