Penstemon albidus

About

Penstemon albidus, commonly known as white penstemon, white-flower beardtongue, or Red-Line Beardtongue is a very widespread perennial flower of the mixed-grass and shortgrass prairies. Its natural distribution is from Manitoba and Alberta in Canada to Texas and New Mexico in the United States. The bright white flowers for which it are named are quite attractive to both bees and hummingbird moths.

Summary from Wikipedia