This name is a synonym of Penstemon confertus var. geniculatus (Greene) Jeps..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50314816) with original publication details: Univ. Calif. Publ. Bot. 9: 325 1921.
This name was in version 1 of The Plant List, record tro-50314816.