⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29201241, with some changes.
This name is a synonym of Penstemon glaber var. alpinus (Torr.) A. Gray.
The record derives from Tropicos which reports it as a synonym (record 29201241) with original publication details: Ann. Lyceum Nat. Hist. New York 1(1): 35-36 35 1823.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:807986-1.