⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50107891, with some changes.
This name is a synonym of Penstemon crandallii subsp. glabrescens (Pennell) D.D. Keck.
The record derives from Tropicos which reports it as a synonym (record 50107891) with original publication details: Contr. U.S. Natl. Herb. 20(9): 375-376 375 1920.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187433-2.