⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50322513, with some changes.
This name is a synonym of Penstemon procerus var. tolmiei (Hook.) Cronquist.
The record derives from Tropicos which reports it as a synonym (record 50322513) with original publication details: Brittonia 8(4): 249 249 1957.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187690-2.