The water surface of a dirty lake is covered with floating plants Pontederia crassipes & x28 Eichhornia crassipes& x29 , duckweed

The water surface of a dirty lake is covered with floating plants Pontederia crassipes & x28 Eichhornia crassipes& x29 , duckweed & x28 Wolffia arrhiza& x29 and & x28 Lemna turionifera