This name is a synonym of Philadelphus delavayi var. melanocalyx Lemoine ex L. Henry.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50077713) with original publication details: J. Arnold Arbor. 36(4): 329 1955.
This name was in version 1 of The Plant List, record tro-50077713, and has not been changed.