This name is a synonym of Ranunculus serpens subsp. polyanthemophyllus (W.Koch & H.E.Hess) Kerguélen.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Ann. Bot. Fenn. 25: 293 1988.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:954766-1.
This name was in version 1 of The Plant List, record kew-2527048, and has not been changed.