Mexican Evening Primrose (Oenothera speciosa)
One of my all-time favs. They grow nicely out here in the desert and they produce incredibly attractive flowers. I've noticed that a few people have them in their front yards, but it would be nice to see more of them! They're easy to grow and care for. I recommend them highly!
MORE INFO: http://davesgarden.com/guides/pf/go/236/