⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29204285, with some changes.
This name is a synonym of Penstemon procerus var. modestus (Greene) N.H. Holmgren.
The record derives from Tropicos which reports it as a synonym (record 29204285) with original publication details: Leafl. Bot. Observ. Crit. 1(12): 165 165 1906.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187498-2.