This name is a synonym of Ruilopezia atropurpurea (A.C.Sm.) Cuatrec..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 57AAEAEE-E734-498E-B56F-6A7848B431B0) with original publication details: Brittonia 1 508 1935.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:205063-1.
This name was in version 1 of The Plant List, record gcc-78983, and has not been changed.