This name is a synonym of Stachys recta subsp. baldaccii (K.Malý) Hayek.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 465388) with original publication details: Oesterr. Bot. Z. 56: 105 1906.
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 baldaccii in version 1 of The Plant List.