N
any of various pond plants of the genus Myriophyllum, having feathery underwater leaves and small inconspicuous flowers: family Haloragidaceae 狐尾藻属植物
Some kinds of fish will keep lakes and water-ways clear by eating water weeds. the Chinese grass carpis one. iteatslarge amountsofwater milfoil and otherweeds that growunderthewatersurface.