Leymus simplex (Scribn. & T.A. Williams) D.R. Dewey Leymus simplex (Scribn. & T.A. Williams) D.R. Dewey in Brittonia 35(1): 32. 1983 sec. Dávila & al. 2006=Elymus simplex Scribn. & Williams in Bull. Div. Agrostol., U.S.D.A. 11: 57, t. 17. 1898 syn. sec. ???