H ydrilla stems are slender, branched and up to 25 feet long. Hydrilla's small leaves are strap-like and pointed. They grow in whorls of four to eight around the stem. The leaf margins are distinctly saw-toothed. Hydrilla often has one or more sharp teeth along the length of the leaf mid-rib .
Hydrilla produces tiny white flowers on long stalks.
MB Hydrocotyle species Water pennywort W ater pennyworts are very common. They have long creeping stems that often form dense mats. Water pennyworts occur in and near ponds, lakes, rivers, and marshes. A profusion of leaves and stems is characteristic of water pennyworts. The stems can grow to many feet long.