Amsonia tabernaemontana

Family: Apocynaceae   
Common Names: Eastern Bluestar, Blue Dogbane, Willow Amsonia, Woodland Bluestar

Native to USA:  AL, AR, DE, FL, GA, IL, IN, KS, KY, LA, MA, MD, MO, MS, NC, NJ, NY, OH, OK, PA, SC, TN, TX, VA