Your Floating Plant
Good morning CYG...
I'm referring to my handy "Aquarium Plant" book and I don't believe you have Water wisteria there. Water wisteria is a stem plant and this one is growing like a variety of Water sprite.
The leaves of the Water sprite will grow in different forms depending on the substrate or if it's floating. The Water sprite I have likes to be floated, so it's closer to the light source and some of the leaves do get fairly large.
"Fear not my child, just change the tank water."