Achnatherum curvifolium (Swallen) Barkworth Achnatherum curvifolium (Swallen) Barkworth in Phytologia 74(1): 7. 1993 sec. Dávila & al. 2018=Stipa curvifolia Swallen in J. Wash. Acad. Sci. 23(10): 456. 1933 syn. sec. Dávila & al. 2006