⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50080462, with some changes.
This name is a synonym of Penstemon newberryi subsp. sonomensis (Greene) D.D. Keck.
The record derives from Tropicos which reports it as a synonym (record 50080462) with original publication details: Pittonia 2(10C): 218 218 1891.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187777-2.