This name is a synonym of Mimulus guttatus var. depauperatus (A. Gray) A.L. Grant.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50102063) with original publication details: Bot. California 1: 567 1876.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:162276-2.
This name was in version 1 of The Plant List, record tro-50102063, and has not been changed.