Not sure, this is a picture of another person's plant. She pulled it up and now says it has thumb size sweet potatoes on it. I've seen only the pictures, and the leaves look strange but kinda familiar. Say's it's a sweet potato, she had forgotten she planted.
Most of the ornamental sweet potatoes I have seen are bright yellow green. But the leaves are shaped similar to those in the picture.
And I think there is a white/green variegated.