This name is a synonym of Ruilopezia margarita (Cuatrec.) Cuatrec..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 6829527F-2749-49FE-AB76-A9AA2DB662AE) with original publication details: Phytologia 27 49 1973.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:97721-2.
This name was in version 1 of The Plant List, record gcc-107255, and has not been changed.