This name is a synonym of Penstemon newberryi var. berryi (Eastw.) N.H. Holmgren.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50080354) with original publication details: Bull. Torrey Bot. Club 32(4): 209–210 1905.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:311986-2.
This name was in version 1 of The Plant List, record tro-50080354.