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 50314814) with original publication details: Pittonia 3(18D): 310–311 1898.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:187419-2.
This name was in version 1 of The Plant List, record tro-50314814.