This name is a synonym of Magnolia fraseri Walter.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117455) with original publication details: Encycl. 3: 673 1792.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:554642-1.
This name was in version 1 of The Plant List, record kew-117455.