This name is a synonym of Gymnocalycium pflanzii subsp. zegarrae .
The record derives from WCSP (in review) (data supplied on ) which reports it as a synonym with original publication details: Kakteen And. Sukk. 9: 24 1958.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:115491-2
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This name was in version 1 of The Plant List, record kew-2835811, and has not been changed.