Milfoil stays submerged except for a stalk of tiny flowers,
which can extend above the surface. Milfoil has finely-divided leaves which are whorled around the stem. The hairs sticking out of
each leaf are called leaflets. If there are 5–10 leaflets on the leaf then it is Northern Water Milfoil; if there are
12 or more leaflets then it is Eurasian Water Milfoil.