This name is a synonym of Stachys oblongifolia Wall. ex Benth..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 454174) with original publication details: Bot. Mag. (Tokyo) 34: 48 1920.
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Stachys palustris in version 1 of The Plant List.