Butterfly weed Asclepias tuberosa, with orange insects
These insects clearly "belong" on this butterfly weed seed pod. They're attached to it, and they are colored like the flowers. They are nymphs (not mature) because later, the wings were larger, and the insects appeared darker. South Carolina, Pickens County, upstate, Summer 2005. The pod is roughly a decimeter/3 inches long. Like milkweed, a close relative, butterfly weed seed pods split open and seeds, each with its own parachute, are released.
Larger sizes available.
To see more flowers on this plant, see this photo.
Go here for a close-up of the flowers of butterflyweed, and of what I believe is the same kind of insect, also in my wife's flower garden (perhaps the same plant) in a different year.