⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50079698, with some changes.
This name is a synonym of Penstemon pachyphyllus var. congestus (M.E. Jones) N.H. Holmgren.
The record derives from Tropicos which reports it as a synonym (record 50079698) with original publication details: Ann. Carnegie Mus. 26: 331 331 1937.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187303-2.