⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-100362067, 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 100362067) with original publication details: Pap. Mich. Acad. Sci. 26: 18 18 1940.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187585-2.