Plant: small aquatic plant Leaves: FRONDS submerged, 3-50 cohering and very often forming branched chains, narrowly ovate, 3-15 mm long (without stalk), 2-3.5 times as long as wide, flat and thin, narrowed at the base into a 2-20 mm long green stalk; margins distally denticulate; nerves (1-)3, the laterals only in the lower part of the frond; papillae absent; anthocyanin often present; air spaces smaller than 0.3 mm Flowers: rare (the flowering fronds floating on the water's surface), 1-ovulate, the small utricular scale with a narrow opening at the top Fruit: 0.6-0.9 mm long, laterally winged towards the top SEEDS: with 12 to 18 distinct ribs Misc: Mesotrophic, quiet waters rich in calcium; 2100-2700 m (7000-9000 ft); May-Aug Notes: root up to 2.5 cm long (sometimes not developed), the sheath unwinged, the tip pointed; turions absent REFERENCES: Landolt, Elias. 1992. Lemnaceae. Ariz.-Nev. Acad. Sci. 26(1)2.