This name is a synonym of Ranunculus eschscholtzii var. helleri (Rydb.) L.D. Benson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50078123) with original publication details: Bull. Torrey Bot. Club 29(3): 158–159 1902.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:217350-2.
This name was in version 1 of The Plant List, record tro-50078123, and has not been changed.