A fine capture, Jeff. To my humble opinion, a slightly crop would have enhanced the beauty of this capture. With respect to determination its species: it could be the flower of the Asclepias variegata, aka redring milkweed or white milkweed, in this case the white species.
Try to change what you can't accept, but accept what you can't change. Please CLICK HERE to see my journal! Feel free to save my images or to add them to your favorites.