Marsileaceae
Plants aquatic, rhizome submerged in the mud but some of the laminas may be floating. Sporocarps hard and woody, borne at the base of or along the stipes, 3–9 mm long Marsileaceae
Sporocarps without teeth. Stalks of the sporocarps usually branched once to thrice. Leaflets of the terrestrial forms glabrous or with a few hairs at the base, broadly obovate-cuneate to very broadly obovate-cuneate, 2.4–4.2 cm long, 2.3–4.3 cm broad in the floating forms but narrowly obovate-cuneate to very broadly obovate-cuneate, 0.4–1.9 cm long, 0.3–2.2 cm broad in the terrestrial forms. Widespread. Edges of ponds and lagoons, on river banks and in deep water Marsilea mutica
Sporocarps with 1 or more usually 2 teeth. Stalks of the sporocarps very rarely branched. Leaflets of the terrestrial forms often very densely hirsute. Stalks shorter than the sporocarps