Photo: T.Pennington, Portland State University. Drawing: University of Florida/IFAS Center for Aquatic and Invasive Plants
Brazilian elodea has dense whorls of 4-6 leaves growing from submersed stems. Under magnification fine serrations are visible on the blade-shaped leaves. Unique double whorls, known as double nodes, occur along the stem wherever it branches. White, yellow-centered flowers grow on stalks from leaf axils to the water surface.
Brazilian elodea is native to South America . It was introduced to the United States as an aquarium plant and is now present in many states including New Hampshire , Vermont and Massachusetts . Although Brazilian elodea resembles hydrilla it does not produce tubers. Its only means of reproduction is from plant fragments containing a double node.