⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29201240, with some changes.
This name is a synonym of Penstemon laevigatus subsp. alluviorum (Pennell) R.W. Benn..
The record derives from Tropicos which reports it as a synonym (record 29201240) with original publication details: Man. S.E. Fl. 1203 1203 1933.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187131-2.