This name is a synonym of Rumex persicarioides L..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26000190) with original publication details: Brittonia 30(2): 295 1978.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:224459-2.
This name was in version 1 of The Plant List, record tro-26000190, and has not been changed.