This name is a synonym of Magnolia cubensis Urb..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117527) with original publication details: Novosti Sist. Vyssh. Rast. 11: 179 1974.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:149282-2.
This name was in version 1 of The Plant List, record kew-117527.