Myriophyllum heterophyllum Michaux8 of 12
June 18, Middlesex Fells, Medford
variable watermilfoil
A close-up view of the terminal spike. Flowers are in whorls
of 4-6. Flowers in lower axils are pistillate (or hermaphrodite).
Each pistillate flower exhibits four large pink stigmas. Perianth of
pistillate flowers is toothed, but not parted.