This name is a synonym of Magnolia × soulangeana Soul.-Bod..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117676) with original publication details: Deut. Dendrol. 146 1893.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:554756-1.
This name was in version 1 of The Plant List, record kew-117676.