ELYMUS. See LEYMUS for most of the plants formerly included in this genus (blame the taxonomists, not us).
ELYMUS magellanicus (Agropyron pubiflorum). Blue wheatgrass. Temperate South America. As you can see, someone has been hard at work rearranging all the grasses you thought you knew, and many you didn’t. This is a startling perennial grass, not for habit but for color. It forms spreading clumps of shoots, with long, tapered leaves. These are nearly erect and arching in some forms and lie close to the ground in others. Both leaves and stems are colored a chalky blue, brighter than that of any of the other “blue” grasses. Slender flowering stems with narrow spikes of flowers rise 2’ or more in summer. These are not substantial enough to make much of a show.
Blue wheatgrass is a bold plant, perhaps best used in borders and swatches, for it is a little hard to combine with subtler things in mixed plantings. Sun, reasonably well drained soil, moderate watering. Hardy to around 0oF.