⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29201253, with some changes.
This name is a synonym of Penstemon confertus var. attenuatus (Douglas ex Lindl.) M.E. Jones.
The record derives from Tropicos which reports it as a synonym (record 29201253) with original publication details: Edwards's Bot. Reg. 15: pl. 1295 pl. 1295 1830.