Family, Water Milfoil. Color, purplish. An aquatic, with the flowers coming to the surface of the water. Flowers, of 2 sorts, the staminate with a short calyx-tube and 4 stamens; pistillate, 2 to 4 petals, 4 styles, and a 2 to 4-celled ovary. Flowers in spikes, 4 to 8 inches long, seen above the water. Leaves, those accompanying the flowers linear, cut-toothed, whorled, 4 or 5 in a whorl, or scattered; those below on the slender stem, finely cut into thread-like divisions, also whorled.
Rhode Island to Florida and westward, near the coast in shallow ponds with muddy bottoms.