This name is a synonym of Deutzia calycosa var. macropetala Rehder.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Deitsii-Dekorativnye Kustarniki 79 1966.
This name was in version 1 of The Plant List, record kew-2763282, and has not been changed.