This name is a synonym of Magnolia platyphylla (Merr.) Figlar & Noot..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 66684) with original publication details: Blumea 31: 102 1985.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:914987-1.
This name was in version 1 of The Plant List, record kew-66684, and has not been changed.