This name is a synonym of Deutzia corymbosa var. staurothrix (Airy Shaw) Zaik..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Bull. Misc. Inform. Kew 1934: 181 1934.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:790908-1.
This name was in version 1 of The Plant List, record kew-2763359, and has not been changed.