Echinocereus scheeri (Salm-Dyck) Scheer Echinocereus scheeri (Salm-Dyck) Scheer, Bot. Voy. Herald: 291. 1856 sec. Hunt 2016≡Cereus scheeri Salm-Dyck, Cact. hort. dyck., ed. 3: 190. 1850 syn. sec. Guzmán & al. 2003