Last year I plundered some vines from a park near our house. And then spent hours online trying to identify them. As it turns out they are ornamental sweet potato vines. They are extraordinarily easy to propagate in water and transplant to the soil. They seem to do quite well in intense heat and also survived the cooler temperatures with no problem. For the first time that I’ve seen they have begun blossoming. This further confirms the accuracy of their identification.