⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29201379, with some changes.
This name is a synonym of Penstemon leiophyllus var. keckii (Clokey) N.H. Holmgren.
The record derives from Tropicos which reports it as a synonym (record 29201379) with original publication details: Madroño 4(4): 128-130 128 1937.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:282306-2.