Not an accepted name (status: unknown). The accepted name is Penstemon azureus var. angustissimus A.Gray, 1878.

Penstemon azureus subsp. angustissimus (A.Gray) D.D.Keck, 1849 4% complete

No common name

Pl. Hartw.: 327 (1849)

There is no corrections for Penstemon azureus subsp. angustissimus yet.