This name is a synonym of Magnolia acuminata (L.) L..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117431) with original publication details: Bot. Gaz. 87: 232 1919.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:149267-2.
This name was in version 1 of The Plant List, record kew-117431.