This name is a synonym of Penstemon californicus (Munz & I.M. Johnst.) D.D. Keck.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50110078) with original publication details: Bull. S. Calif. Acad. Sci. 23(1): 31–32 1924.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:187453-2.
This name was in version 1 of The Plant List, record tro-50110078, and has not been changed.