This name is a synonym of Penstemon gairdneri subsp. hians (Piper) D.D. Keck.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50113591) with original publication details: Bull. Torrey Bot. Club 27(7): 396–397 1900.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:187414-2.
This name was in version 1 of The Plant List, record tro-50113591.