As classified in WFO snapshot
June 2024
Warning: older classification
variety
Penstemon digitalis var. glaucus
(Graham) Trautv.
This variety name was first published in Bull. Sci. Acad. Imp. Sci. Saint-Pétersbourg 5: 345 (1839)
This variety name has been reclassified since this snapshot. Its current preferred usage is a synonym .