Selenicereus inermis (Otto ex Pfeiff.) Britton & Rose subsp. inermis, Cactaceae (Britton & Rose) 2: 207. 1920 sec. Guzmán 2020
- =Cereus karstenii Salm-Dyck, Cact. hort. dyck., ed. 3: 218. 1850 syn. sec. Bauer 2003
- =Cereus wercklei F.A.C. Weber in Bull. Mus. Hist. Nat. (Paris) 8: 460. 1902 syn. sec. Bauer 2003
- =Selenicereus wercklei (F.A.C. Weber) Britton & Rose, Cactaceae (Britton & Rose) 2: 208. 1920 syn. sec. Bauer 2003
- =Epiphyllum steyermarkii Croizat in Phytologia 28: 19. 1974 syn. sec. Bauer 2003
- =Selenicereus rubineus Kimnach in Cact. Succ. J. (Los Angeles) 65: 17. 1993 syn. sec. Bauer 2003
- =Mediocactus inermis (Otto ex Pfeiff.) Doweld in Sukkulenty 4: 42. 2002 syn. sec. Bauer 2003
- =Mediocactus wercklei (F.A.C. Weber) Doweld in Sukkulenty 4: 42. 2002 syn. sec. Bauer 2003