Spatterdock (Nuphar variegatum)
Common names: Yellow water lily, yellow cow lily, pond lily.
Location: Sheltered areas; shallow waters with muck or silt bottoms.
Description: Rooted plant with bright yellow flower that extends slightly above the surface; flower is surrounded by a heart-shaped leaf; leaf is grass-green colored, 8 to 16 inches long, and may float or extend above the water surface; petiole (leaf stalk) is mostly below the surface.
Hints to identify: Flower forms a yellow "ball" with petals that curve inward; flower rises several inches above water.
Importance of plant: Fruits are eaten by waterfowl and muskrats; the underwater roots contain starch and are edible.
Management strategy: See DNR regulations. Because spatterdock is a valuable and decorative plant, removing it may allow less-desirable plants to move in. If removal is necessary, herbicides or boat traffic provide adequate access.