This name is a synonym of Penstemon procerus var. tolmiei (Hook.) Cronquist.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 29203914) with original publication details: Fl. Bor.-Amer. 2: 98 1838.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:808324-1.
This name was in version 1 of The Plant List, record tro-29203914.