Festuca argentina is a species of grass and a perennial herb, these species have a self-supporting growth form. This species is endemic to native to Argentina.^[2] This species often thrive in mountain slopes. This species was first described in 1935.^[3]

Festuca argentina can grow up to 28 centimetres, and have simple but broad leaves.^[2]This species can clump to a meter high wlong with a long growth period. This species is poisnous to cattle and goats as when consumed, causes a condition called huaicú disease, which can interrupt the reproductive system among cattles, this often happens when overgrazing occurs. Due to its appearance, it can stand out amongst many grasses.