This name is a synonym of Mimulus michiganensis (Pennell) Posto & Prather.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 29205993) with original publication details: Acad. Nat. Sci. Philadelphia Monogr. 1: 119–120, map 23 1935.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:162186-2.
This name was in version 1 of The Plant List, record tro-29205993.