This name is a synonym of Lamium flexuosum Ten..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 458051) with original publication details: Cavanillesia 3: 54 1930.
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 Lamium flexuosum in version 1 of The Plant List.