⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record kew-2604578, and has not been changed.
This name is a synonym of Gymnocalycium reductum subsp. sibalii (Halda & Milt) Neuhuber.
The record derives from WCSP (in review) which reports it as a synonym with original publication details: Acta Mus. Richnov., Sect. Nat. 13: 7 2006.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:77080403-1.