Sterile Asclepias tuberosa
I have a milkweed that never has seed pods. I think it might be a hybrid; however, it looks like Asclepias tuberosa. This plant blooms over and over when the others are done and requires no deadheading. I have had this plant for over 5 years now. I'll post photos of it next year. Maybe others will want some if I can root cuttings!