"Water leaf" is a common name used for many different plants, so it's important to specify which one you're referring to.

Here are a few possibilities:

* Hydrocotyle spp. - This genus includes many plants commonly called "waterleaf," including Pennywort (Hydrocotyle umbellata), Brazilian Pennywort (Hydrocotyle leucocephala), and Indian Pennywort (Hydrocotyle asiatica).

* Talinum triangulare - This plant is also known as Waterleaf or Fame Flower.

* Peperomia spp. - Some Peperomia species are also called "Waterleaf."

To get the correct scientific name, you'll need to provide more information about the specific plant you're asking about.