This name is a synonym of Pentacalia rex (Sandwith) Cuatrec..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 5CA3C461-EA46-4A51-96CE-93C27097FA7E) with original publication details: 73 1992.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:963608-1.
This name was in version 1 of The Plant List, record gcc-97389, and has not been changed.