Echinocereus acifer (Otto ex Salm-Dyck) Haage Echinocereus acifer (Otto ex Salm-Dyck) Haage, Cact.-Verz.: 19. 1859 sec. Hunt & al. 2006≡Cereus acifer Otto ex Salm-Dyck, Cact. hort. dyck. 1849: 189. 1850 syn. sec. Guzmán & al. 2003