This name is a synonym of Penstemon angelicus (I.M. Johnst.) Moran.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50289856) with original publication details: Proc. Calif. Acad. Sci., ser. 4, 12(30): 1165 1924.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:187269-2.
This name was in version 1 of The Plant List, record tro-50289856.