Gymnocalycium schickendantzii subsp. delaetii (K.Schum.) G.J.Charles in Cactaceae Syst. Init. 20: 18. 2005 sec. Charles 2009
- ≡Echinocactus delaetii K.Schum. in Monatsschr. Kakteenk. 11: 186. 1901 syn. sec. Charles 2009
- ≡Gymnocalycium delaetii (K.Schum.) Hosseus in Revista Centro Estud. Farm. reimpr. 2(6): 22. 1926 syn. sec. Charles 2009
- =Echinocactus joossensianus Boed. in Monatsschr. Kakteenk. 28: 40. 1918 syn. sec. Hunt 2016
- ≡Gymnocalycium joossensianum (Boed.) Britton & Rose, Cactaceae 3: 166. 1922 syn. sec. Hunt 2016
- =Gymnocalycium antherostele F.Ritter, Kakteen Südamerika 2: 475. 1980 syn. sec. Charles 2009
- =Gymnocalycium delaetii f. antherosacos F.Ritter ex Neuhuber in Gymnocalycium 14: 423. 2001 syn. sec. Kew WCVP (2019)