This name is a synonym of Philadelphus schrenkii var. mandshuricus (Maxim.) Kitag..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50077571) with original publication details: Mém. Acad. Imp. Sci. Saint Pétersbourg, Sér. 7 10(16): 41 1867.
This name was in version 1 of The Plant List, record tro-50077571, and has not been changed.