⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-29204542, with some changes.
This name is a synonym of Penstemon canescens f. brittoniorum (Pennell) Fernald.
The record derives from Tropicos which reports it as a synonym (record 29204542) with original publication details: Man. S.E. Fl. 1204, 1508 1204 1933.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:1010511-2.