This name is a synonym of Mimulus tenellus var. nepalensis (Benth.) Tsoong.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50056791) with original publication details: 4: 13 1975.
This name was in version 1 of The Plant List, record tro-50056791, and has not been changed.