This name is a synonym of Magnolia floribunda (Finet & Gagnep.) Figlar.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 349177) with original publication details: J. Bot. 68: 210 1930.
This name was in version 1 of The Plant List, record kew-349177, and has not been changed.