moneywort.. but then again it can be a form of green hedge
Unless it's just the angle or different kind... it looks different to my moneywort. My money wort has smaller more and slightly more elongated leaves.
There again- it was Petsmart who sold me my moneywort. They also sold me a water wisteria that I don't think IS a water wisteria based on photos online. (also it is dying whilst my other plants are doing well- so I wonder if what they sold me is even aquatic).