This name is a synonym of Rumex triangulivalvis (Danser) Rech. f..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26001447) with original publication details: Ned. Kruidk. Arch. 1925: 415, pl. 1, f. 1–2 1926.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:224501-2.
This name was in version 1 of The Plant List, record tro-26001447.