CABOMBACEAE, Water-Shield Family

Aquatic herbs; plants with long, slender, leafy, distally floating stems in addition to the rhizomes, with or without floating leaf·blades, often some or all of the leaves submersed and dissected; flowers perfect, regular, hypogynous; sepals and petals 3 each, petaloid, free and distinct; stamens 3-18; carpels distinct; ovules and seeds 2 or 3.