This name is a synonym of Magnolia sprengeri Pamp..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117518) with original publication details: Bull. Acad. Imp. Sci. Saint-Pétersbourg 17: 419 1872.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:77062234-1.
This name was in version 1 of The Plant List, record kew-117518.