⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50102527, with some changes.
This name is a synonym of Penstemon eatonii subsp. exsertus (A. Nelson) D.D. Keck.
The record derives from Tropicos which reports it as a synonym (record 50102527) with original publication details: Amer. J. Bot. 18(6): 438 438 1931.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187385-2.