⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29204332, with some changes.
This name is a synonym of Penstemon strictus subsp. strictiformis (Rydb.) D.D. Keck.
The record derives from Tropicos which reports it as a synonym (record 29204332) with original publication details: Bull. Torrey Bot. Club 31(12): 642 642 1904.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187794-2.