This name is a synonym of Magnolia × wiesneri Carr.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117896) with original publication details: Bot. Mag. 117: t. 7157 1891.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:554879-1.
This name was in version 1 of The Plant List, record kew-117896.