This name is a synonym of Ranunculus flammula var. ovalis (J.M. Bigelow) L.D. Benson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 27101572) with original publication details: Bull. Torrey Bot. Club 69(4): 306 1942.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:217298-2.
This name was in version 1 of The Plant List, record tro-27101572, and has not been changed.