This name is a synonym of Ranunculus occidentalis var. brevistylus Greene.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 27101654) with original publication details: Bull. Torrey Bot. Club 68(3): 167 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:217480-2.
This name was in version 1 of The Plant List, record tro-27101654.