Muhlenbergia andina, known by the common name Foxtail muhly, is a species of grass. It is native to western North America from British Columbia to California to Texas. It grows in moist habitat such as meadows, marshes, and riparian riverbanks. Muhlenbergia andina is a rhizomatous perennial grass growing 25 to 85 centimeters tall. The inflorescence is a narrow, dense cluster of appressed, upright branches bearing small, silky-haired spikelets.