This name is a synonym of Philadelphus subcanus var. magdalenae (Koehne) S.Y. Hu.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50077724) with original publication details: Mitt. Deutsch. Dendrol. Ges. 13: 83 1904.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:792260-1.
This name was in version 1 of The Plant List, record tro-50077724, and has not been changed.