Cephalocereus nudus E.Y. Dawson, Allan Hancock Found. Publ. Occas. Pap. 1-2: 12. 1948 sec. Tapia & al. 2017
- =Cephalocereus tetetzo var. nudus (E.Y. Dawson) E.Y. Dawson in Desert Pl. Life 24: 54. 1952 syn. sec. Tapia & al. 2017
- =Neobuxbaumia tetetzo var. nuda (E.Y. Dawson) E.Y. Dawson in Cact. Succ. J. (Los Angeles) 24: 169. 1952 syn. sec. Tapia & al. 2017
- =Neobuxbaumia squamulosa Scheinvar & Sánchez-Mej. in Cact. Suc. Mex. 35: 13. 1990 syn. sec. Tapia & al. 2017
- =Carnegiea squamulosa (Scheinvar & Sánchez-Mej.) P.V. Heath in Calyx 2: 108. 1992 syn. sec. POWO 2019
- =Carnegiea tetetzo var. nuda (E.Y. Dawson) P.V. Heath in Calyx 2: 108. 1992 syn. sec. Tapia & al. 2017