This name is a synonym of Penstemon crandallii var. taosensis (D.D. Keck) G.T. Nisbet & R.C. Jacks..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50110066) with original publication details: Bull. Torrey Bot. Club 64(6): 373–374 1937.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:310149-2.
This name was in version 1 of The Plant List, record tro-50110066.