⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50316055, with some changes.
This name is a synonym of Penstemon canescens (Britton) Britton.
The record derives from Tropicos which reports it as a synonym (record 50316055) with original publication details: Mem. Torrey Bot. Club 2: 30 30 1890.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187586-2.