elymus trachycaulos(n = noun.plant) agropyron pauciflorum, agropyron trachycaulum, slender wheatgrass - North American grass cultivated in western United States as excellent forage crop;
is a kind of wheat-grass, wheatgrass

elymus, elymus arenarius, elymus canadensis, elymus caput-medusae, elymus condensatus, elymus hispidus, genus elymus