Echinocereus enneacanthus Engelm., Memoir Tour N. Mexico [Wislizenus]: 111. 1848 sec. Guzmán & al. 2003
- =Cereus dubius Engelm. in Proc. Amer. Acad. Arts 3: 282. 1856 syn. sec. Guzmán & al. 2003
- =Echinocereus dubius (Engelm.) Rümpler, Handb. Cacteenk. (ed. 2): 787. 1886 syn. sec. Guzmán & al. 2003
- =Echinocereus uspenskii Blanc, Cat. & Hints on Cacti, ed. 2: 40. 1888 syn. sec. Guzmán & al. 2003
- =Echinocereus merkeri Hildm. ex K. Schum., Gesamtbeschr. Kakt.: 277. 1898 syn. sec. Guzmán & al. 2003
- =Echinocereus sarissophorus Britton & Rose, Cactaceae (Britton & Rose) 3: 38. 1922 syn. sec. Guzmán & al. 2003
- =Echinocereus enneacanthus var. dubius (Engelm.) L.D. Benson in Cact. Succ. J. (Los Angeles) 41: 127. 1969 syn. sec. Guzmán & al. 2003