This name is a synonym of Rumex dentatus L..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26000192) with original publication details: Pl. Japan. 2: 471 1879.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:697344-1.
This name was in version 1 of The Plant List, record tro-26000192, and has not been changed.