Wasp on Sedum
This wasp, which I believe is Prionyx thomae (P. parkeri and P. canadensis are similar), seemed very interested in a flowering sedum, probably collecting nectar though conceivably just looking for prey.
Prionyx thomae, fairly common in the western U.S. south to Argentina is a solitary wasp. The female kills prey such as grasshoppers by injecting it with venom, then carries the remains back to its next where it can serve as a host for its offspring. The stinger is not barbed like that of a bee, so it does not break off in its victim, and the female can inflict multiple stings. The male, however, lacks a stinger entirely.