This name is a synonym of Sulcorebutia tiraquensis (Cárdenas) F. Ritter.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50139614) with original publication details: Kakteen And. Sukk. 25(5): 97 1974.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:247868-2.
This name was in version 1 of The Plant List, record tro-50139614.