Hello,

Hope you are doing well.

As per your question, the plant which grow in polluted water is only wolffia. Wolffia normally grow in canal Or ponds where you can see in day to day life. Wolffia neither has a leaves nor a stem. So this plant is also considered under weird plants.Also woffia is popularly known as per their scientific name and Scientific name of this wolffia is Lemnaceae .

So hope this information helps you out. Thank you.