This name is a synonym of Magnolia cubensis subsp. acunae Imkhan..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 335128) with original publication details: Novosti Sist. Vyssh. Rast. 11: 181 1974.
This name was in version 1 of The Plant List, record kew-335128, and has not been changed.