This name is a synonym of Mentha japonica (Miq.) Makino.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 127440) with original publication details: Trans. Sapporo Nat. Hist. Soc. 14: 8 1935.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:451928-1.
This name was in version 1 of The Plant List, record kew-127440.