This name is a synonym of Ranunculus platensis A. Spreng..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 27100574) with original publication details: Bol. Acad. Nac. Ci. 4: 209 1881.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:712898-1.
This name was in version 1 of The Plant List, record tro-27100574, and has not been changed.