This name is a synonym of Rumex cristatus subsp. kerneri (Borbás) Akeroyd & D.A.Webb.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Fl. Comit. Temesiensis 34 1884.
This name was in version 1 of The Plant List, record kew-2423985, and has not been changed.