Elymus interruptus Buckley Elymus interruptus Buckley in Proc. Acad. Nat. Sci. Philadelphia 14: 99. 1862 sec. Dávila & al. 2006=Elymus occidentalis Scribn. in Bull. Div. Agrostol. U.S.D.A. 13: 49. 1898 syn. sec. The Plant List 2013