This name is a synonym of Veronica serpyllifolia subsp. humifusa (Dicks.) Syme.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Syll. Pl. Nov. 2: 247 1828.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:811627-1.
This name was in version 1 of The Plant List, record kew-2454125.