Tarantula Hawk Moths on pretty native milkweed called Horsetail Milkweed
Horsetail Milkweed (Asclepias subverticillata) in the far west part of Canon City. While Horsetail Milkweed is listed as native in Colorado the 'Floristic Synthesis of North America' lists it as a 'Native Species, but adventive in state.' Had to look that up--'adventive species' refers to "a species that has arrived in a new locality" which may have been with help of people or it may not (ie, range expansion). As a native milkweed it is an important plant for Monarch Butterflies as well as other insects.