This name is a synonym of Penstemon speciosus var. piliferus (A. Heller) Munz & I.M. Johnst..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50114913) with original publication details: Muhlenbergia 2(1C): 136–137 1906.
This name was in version 1 of The Plant List, record tro-50114913.