This name is a synonym of Rumex conglomeratus Murray.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26001149) with original publication details: Fl. Brit. 1: 391–392 1800.
This name was in version 1 of The Plant List, record tro-26001149, and has not been changed.