This name is a synonym of Magnolia × soulangeana Soul.-Bod..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50301538) with original publication details: Sert. Bot. 110: 13, t. 1832.
This name was in version 1 of The Plant List, record tro-50301538.