⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29203949, with some changes.
This name is a synonym of Penstemon menziesii subsp. davaidsonii (Greene) Pennell & D.D. Keck.
The record derives from Tropicos which reports it as a synonym (record 29203949) with original publication details: Contr. U.S. Natl. Herb. 11: 499 499 1906.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187476-2.