No, moonflowers are in the morning glory family, just like sweet potato vines are. Completely different looking and completely different family of plants, @Mary Stetler . They just both happen to be white, but moonflower is a vine and it dies in the fall, just like morning glory vines do. There are apparently 2 flowers called moonflower, and one of them is from the datura family, and the other one is from the Ipomoea family (which is the one I have.) https://www.gardeningknowhow.com/ornamental/flowers/datura/moonflower-vs-datura.htm