Not an accepted name (status: unknown). The accepted name is Penstemon newberryi var. sonomensis (Greene) Jeps., 1901.

Penstemon newberryi subsp. sonomensis (Greene) D.D.Keck, 1901 16% complete

No common name

Fl. W. Calif.: 401 (1901)

There is no corrections for Penstemon newberryi subsp. sonomensis yet.