⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50079555, with some changes.
This name is a synonym of Penstemon guadalupensis var. ernestii (Pennell) Cory.
The record derives from Tropicos which reports it as a synonym (record 50079555) with original publication details: Acad. Nat. Sci. Philadelphia Monogr. 1: 252-253, map 64 252 1935.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187522-2.