Ephedra antisyphilitica Berland. ex C.A. Mey. Ephedra antisyphilitica Berland. ex C.A. Mey. in Mém. Acad. Imp. Sci. Saint-Pétersbourg, Sér. 6, Sci. Math., Seconde Pt. Sci. Nat. 5(2): 291. 1846 sec. Villanueva-Almanza & Fonseca 2011=Ephedra occidentalis Torr. & Parl., Prodr. 16(2,2): 354. 1868 syn. sec. Villanueva-Almanza & Fonseca 2011=Ephedra texana E.L. Reed in J. Torrey Bot. Club 62: 43. 1935 syn. sec. Villanueva-Almanza & Fonseca 2011