This name is a synonym of Gymnocalycium leptanthum (Speg.) Speg..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 5105043) with original publication details: Anales Mus. Nac. Buenos Aires 4: 504 1905.
This name was in version 1 of The Plant List, record tro-5105043, and has not been changed.