Elymus hoffmannii (also, E. hoffmanni) is a species of grass known by the common name RS wheatgrass. It was described as a new species in 1996. It became known to science when some grasses were collected in Turkey in 1979 and one type was successfully bred out, proving to be a natural hybrid. E. hoffmannii is derived from this hybrid between Elymus repens and the bluebunch wheatgrasses (Pseudoroegneria spp.) of Turkey, such as Pseudoroegneria spicata.