This name is a synonym of Philadelphus subcanus Koehne.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50078330) with original publication details: Repert. Spec. Nov. Regni Veg. 10(237–242): 127 1911.
This name was in version 1 of The Plant List, record tro-50078330.