This name is a synonym of Ranunculus micropetalus (Greene) Rydb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50079035) with original publication details: Pittonia 2(9): 110 1890.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:217110-2.
This name was in version 1 of The Plant List, record tro-50079035, and has not been changed.