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

Penstemon humilis subsp. brevifolius (A.Gray) D.D.Keck, 1862 4% complete

No common name

Keck DD (1945) Studies in Penstemon VIII A Cyto-taxonomic Account of the Section Spermunculus. American Midland Naturalist 33(1): 128. doi: 10.2307/2421327.

There is no corrections for Penstemon humilis subsp. brevifolius yet.