This name is a synonym of Hydrangea hirta (Thunb.) Siebold.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50327378) with original publication details: Fl. Jap. 124 1784.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:149728-1.
This name was in version 1 of The Plant List, record tro-50327378, and has not been changed.