⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29201414, with some changes.
This name is a synonym of Penstemon pachyphyllus var. mucronatus (N.H. Holmgren) Neese.
The record derives from Tropicos which reports it as a synonym (record 29201414) with original publication details: Brittonia 31(2): 234-236, f. 10, 12 234 1979.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:282311-2.