This name is a synonym of Ruilopezia leucactina (Cuatrec.) Cuatrec..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record B9BC5C85-E220-418F-901A-A4DBE20A3037) with original publication details: Phytologia 29 377 1975.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:97708-2.
This name was in version 1 of The Plant List, record gcc-105078, and has not been changed.