This name is a synonym of Mimulus lewisii f. tetonensis (A. Nelson) J.F. Macbr. & Payson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50102160) with original publication details: Bot. Gaz. 34(1): 31 1902.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:162262-2.
This name was in version 1 of The Plant List, record tro-50102160.