In the past this name has been erroneously used to refer to Veronica austriaca subsp. teucrium (L.) D.A.Webb.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a misapplied name with original publication details: Sp. Pl. 1: 71 1797.
This name record (from WCSP (in review)) 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 Veronica paniculata in version 1 of The Plant List.