This name is a synonym of Ranunculus peltatus subsp. fucoides (Freyn) Muñoz Garm..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Butl. Inst. Catalana Hist. Nat., Secc. Bot. 38(1): 65 1974.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:889050-1.
This name was in version 1 of The Plant List, record kew-2524208, and has not been changed.