⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50338158, with some changes.
This name is a synonym of Penstemon fruticosus var. scouleri (Douglas ex Lindl.) Cronquist.
The record derives from Tropicos which reports it as a synonym (record 50338158) with original publication details: Edwards's Bot. Reg. 15: pl. 1277 pl. 1277 1829.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187763-2.