Mammillaria duoformis R.T. Craig & E.Y. Dawson, Allan Hancock Found. Publ. Occas. Pap. 1-2: 59. 1948 sec. Hunt 2016
- =Mammillaria duoformis var. rectiformis R.T. Craig & E.Y. Dawson, Allan Hancock Found. Publ. Occas. Pap. 1-2: 60. 1948 syn. sec. Guzmán & al. 2003
- =Mammillaria rossiana Heinrich in Kakteen And. Sukk. 9: 119. 1958 syn. sec. Guzmán & al. 2003
- =Mammillaria erythrocalix Buchenau in Cact. Suc. Mex. 11: 42. 1966 syn. sec. Guzmán & al. 2003
- =Mammillaria claviformis Repp., Gatt. Mammillaria: 91. 1987 syn. sec. Guzmán & al. 2003
- =Mammillaria duoformis var. xuchiapensis Repp., Gatt. Mammillaria: 104. 1987 syn. sec. Guzmán & al. 2003