Hordeum jubatum is a species of grass known by the common name squirreltail barley. It is native to western North America, where it grows in many types of habitat, including grasslands, sagebrush, and forests. The plant is an annual that grows up to 3 feet (91 cm) tall and has a dense, cylindrical inflorescence of spikelets with long, bristly awns that give it its common name.