This name is a synonym of Penstemon deustus var. heterander (Torr. & A. Gray) Cronquist.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50306615) with original publication details: Pacif. Railr. Rep. 2(1): 123, pl. 8 1855.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:808133-1.
This name was in version 1 of The Plant List, record tro-50306615.