This name is a synonym of Ranunculus alismifolius var. hartwegii (Greene) Jeps..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 27103165) with original publication details: Erythea 3: 45 1895.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:296691-2.
This name was in version 1 of The Plant List, record tro-27103165, and has not been changed.