This name is a synonym of Rhytidophyllum auriculatum var. plumerianum (DC.) Urb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 14000270) with original publication details: Prodr. 7: 524 1839.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:382537-1.
This name was in version 1 of The Plant List, record tro-14000270.