⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29204307, 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 29204307) with original publication details: Proc. Calif. Acad. Sci., ser. 2, 5(18): 714-715 714 1895.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187119-2.