⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29204281, with some changes.
This name is a synonym of Penstemon attenuatus var. militaris (Greene) Cronquist.
The record derives from Tropicos which reports it as a synonym (record 29204281) with original publication details: Leafl. Bot. Observ. Crit. 1(12): 166 166 1906.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187493-2.