This name is a synonym of Rumex britannica L..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26000118) with original publication details: Manual (ed. 4) 420 1867.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:697361-1.
This name was in version 1 of The Plant List, record tro-26000118, and has not been changed.