Stipa diegoensis Swallen Stipa diegoensis Swallen in J. Wash. Acad. Sci. 30(5): 212, f. 2. 1940 sec. Dávila & al. 2006=Achnatherum diegoense (Swallen) Barkworth in Phytologia 74: 7. 1993 syn. sec. The Plant List 2013