Red Asclepias Tuberosa
I found this growing in a hay field 3 years ago. This is the red one that never makes seed pods. I also noticed that the blooms are arranged differently on the stalks of this one. They are more spread out in little circular groupings. The stems are longer and have blooms all the way down the stalks. I really think this is some sort of hybrid. Unfortunately, this one doesn't set seeds.
This is another plant found in the same field. It has more orange in the blooms; however, the blooms are closer together and the stems are also red. These do set seeds. I would be glad to share seeds of these if people like the dark stems of this plant.
Here are the 'Gay Butterflies' variety. Notice that the blooms are all at the top of the stems in one bunch.