⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29201375, with some changes.
This name is a synonym of Penstemon fruticiformis var. incertus (Brandegee) Munz & I.M. Johnst..
The record derives from Tropicos which reports it as a synonym (record 29201375) with original publication details: Bot. Gaz. 27(6): 454-455 454 1899.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187554-2.