This name is a synonym of Ajuga × adulterina Wallr..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 5362) with original publication details: Term. Füz. 12: 111 1889.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:444648-1.
This name was in version 1 of The Plant List, record kew-5362, and has not been changed.