Mammillaria gigantea Hildm. ex K. Schum., Gesamtbeschr. Kakt.: 578. 1898 sec. Hunt 2016
- =Neomammillaria gigantea (Hildm. ex K. Schum.) Britton & Rose, Cactaceae (Britton & Rose) 4: 85. 1923 syn. sec. Guzmán & al. 2003
- =Mammillaria armatissima R.T. Craig, Mammillaria Handb.: 300. 1945 syn. sec. Guzmán & al. 2003
- =Mammillaria ocotillensis R.T. Craig, Mammillaria Handb.: 314. 1945 syn. sec. Guzmán & al. 2003
- =Mammillaria hastifera Krainz & A. Keller in Schweiz. Gartenzeitung 1946: 11. 1946 syn. sec. Guzmán & al. 2003
- =Mammillaria saint-pieana Backeb. ex Mottram, Mammillaria Index: 80. 1980 syn. sec. Guzmán & al. 2003
- =Mammillaria gigantea subsp. flavovirens Rogoz. & Plein in Mitteilungsbl. Arbeitskreises Mammillarienfr. 27: 138. 2003 syn. sec. Rogozinski & Plein 2003