Penstemon ambiguus

About

Penstemon ambiguus, commonly known as the sand penstemon, pink plains penstemon, or gilia penstemon is a species of Penstemon that grows in the shortgrass prairies and deserts of the western United States and northern Mexico. This bush-like penstemon grows in sandy, loose, and creosote soils and is particularly known for the spectacular flowering show it produces, sometime seasons turning whole hillsides bright pink–white.

Summary from Wikipedia