This name is a synonym of Rumex argentinus Rech. f..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50232986) with original publication details: Pl. Syst. Evol. 172: 173 1990.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:284461-2.
This name was in version 1 of The Plant List, record tro-50232986, and has not been changed.