⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29201280, with some changes.
This name is a synonym of Penstemon laevigatus subsp. calycosus (Small) R.W. Benn..
The record derives from Tropicos which reports it as a synonym (record 29201280) with original publication details: Bull. Torrey Bot. Club 25(9): 470-471 470 1898.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187236-2.