⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29204280, with some changes.
This name is a synonym of Penstemon attenuatus var. pseudoprocerus (Rydb.) Cronquist.
The record derives from Tropicos which reports it as a synonym (record 29204280) with original publication details: Mem. New York Bot. Gard. 1: 346-347 346 1900.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187699-2.