This name is a synonym of Ranunculus cardiophyllus f. apetalus (Farr) B. Boivin.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50118799) with original publication details: Ottawa Naturalist 20(5): 110–111 1906.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:217131-2.
This name was in version 1 of The Plant List, record tro-50118799, and has not been changed.