Philadelphus incanus for validation from Kashmir-GS28112021-2: 7 high res. images.
Philadelphus incanus for validation
Clicked from Hazuribagh Garden, 1600 m, Srinagar, Kashmir, cultivated, 19-5-2012

Pl. also consider Philadelphus coronarius (Cultivated) as per Rosaceae week:: Philadelphus coronarius from Srinagar – (NSJ-01) and Floriculture in India By Gurcharan Singh Randhawa, Amitabha Mukhopadhyay (1986- Details).

Please notice inflorescence and sepals

I feel it does not match with Flora of China as per: 
Leaves abaxially densely white villous, adaxially bristly, hairs appressed, ….
Calyx tube campanulate, densely white appressed strigos