Ephedra aspera Engelm. ex S. Watson Ephedra aspera Engelm. ex S. Watson in Proc. Amer. Acad. Arts 18: 157. 1883 sec. Villanueva-Almanza & Fonseca 2011=Ephedra peninsularis I.M. Johnst. in Univ. Calif. Publ. Bot. 7: 437. 1922 syn. sec. Farjon 2001