Ferocactus cylindraceus subsp. tortulispinus (H.E. Gates) N.P. Taylor
Ferocactus cylindraceus subsp. tortulispinus in Cactaceae Consensus Init. 6: 16. 1998 sec. Hunt 2016
- =Ferocactus acanthodes var. tortulispinus in Cact. Succ. J. (Los Angeles) 27: 168. 1955 syn. sec. Guzmán & al. 2003
- =Ferocactus cylindraceus var. tortulispinus in Cact. Suc. Mex. 25: 65. 1980 syn. sec. Guzmán & al. 2003