This name is a synonym of Penstemon labrosus (A. Gray) Mast. ex Hook. f..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50320416) with original publication details: Bot. California 1: 622 1876.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:318345-2.
This name was in version 1 of The Plant List, record tro-50320416.