This name is a synonym of Magnolia wilsonii (Finet & Gagnep.) Rehder.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50098987) with original publication details: Bull. Soc. Tosc. Ortic. 41: 137 1916.
This name was in version 1 of The Plant List, record tro-50098987.