⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50338184, and has not been changed.
This name is a synonym of Penstemon filiformis (D.D. Keck) D.D. Keck.
The record derives from Tropicos which reports it as a synonym (record 50338184) with original publication details: Man. Calif. Shrubs 517-518 517 1939.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187574-2.