This name is a synonym of Persicaria bistorta (L.) Samp..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: in Fl. Japan 2a: 145 2006.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:77075122-1.
This name was in version 1 of The Plant List, record kew-2603786.