This name is a synonym of Penstemon barbatus subsp. trichander (A. Gray) D.D. Keck.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50107912) with original publication details: Bull. Torrey Bot. Club 33(3): 151 1906.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:187825-2.
This name was in version 1 of The Plant List, record tro-50107912.