⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29204323, and has not been changed.
This name is a synonym of Penstemon longiflorus (Pennell) S.L. Clark.
The record derives from Tropicos which reports it as a synonym (record 29204323) with original publication details: Contr. U.S. Natl. Herb. 20(9): 353 353 1920.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187321-2.