This name is a synonym of Magnolia sieboldii subsp. sinensis (Rehder & E.H.Wilson) Spongberg.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117831) with original publication details: Bot. Mag. 9004 1924.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:554842-1.
This name was in version 1 of The Plant List, record kew-117831.