⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29200166, with some changes.
This name is a synonym of Penstemon cobaea subsp. purpureus (Pennell) Pennell.
The record derives from Tropicos which reports it as a synonym (record 29200166) with original publication details: Proc. Acad. Nat. Sci. Philadelphia 73(3B): 490 490 1921.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187278-2.