Penstemon strictus (Rocky Mountain Penstemon)
I don't see how a Penstemon could get any better than this one, or any flower for that matter, and this lovely photo says it all. Penstemon strictus, native wildflower to the some western states and California, grows to about 30 inches with dark green leaves and erect stems that support brilliant blue/purple blooms in late summer. Penstemon strictus is drought tolerant. Full sun in Zones 3-8. Quarts.