This name is a synonym of Ranunculus pedatifidus subsp. affinis (R.Br.) Hultén.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 27101857) with original publication details: Amer. J. Bot. 27(9): 804, f. 13 1940.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:217260-2.
This name was in version 1 of The Plant List, record tro-27101857, and has not been changed.