This name is a synonym of Sulcorebutia arenacea (Cárdenas) F. Ritter.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 5103145) with original publication details: Cact. Succ. J. (Los Angeles) 23: 94, f. 45, 46 1951.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:218044-2.
This name was in version 1 of The Plant List, record tro-5103145, and has not been changed.