(Myriophyllum farwellii)
Myriophyllum farwellii, Slender aquatic forb of shallow lakes and beaver ponds; stems submerged with delicate branches and foliage, the leaves finely dissected and arranged both alternately and whorled; flowers and fruits borne in axils of submerged leaves. Farwell's water-milfoil is found in shallow water of lakes, ponds, and marshes with mucky or peaty (occasionally sandy) bottoms in the Upper Peninsula. Water plantain, water lobelia, narrow-leaved bur-reed, quillwort, spatterdock, and alga pondweed.