This name is a synonym of Prunella vulgaris subsp. lanceolata (W.P.C.Barton) Piper & Beattie.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 166044) with original publication details: Proc. Biol. Soc. Wash. 13: 134 1900.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:210713-2.
This name was in version 1 of The Plant List, record kew-166044, and has not been changed.