This name is a synonym of Rebutia deminuta (F.A.C. Weber) Britton & Rose.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50138711) with original publication details: Succulenta (Netherlands) 56(3): 64 1977.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:218197-2.
This name was in version 1 of The Plant List, record tro-50138711, and has not been changed.