This name is a synonym of Ruilopezia ruizii (Cuatrec.) Cuatrec..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 5A50E18A-CAE4-47D1-BEBA-90183D513233) with original publication details: Phytologia 23 362 1972.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:97767-2.
This name was in version 1 of The Plant List, record gcc-95759, and has not been changed.