Plant: Small aquatic plant Leaves: FRONDS floating on the water's surface, single or 2 to a few cohering in small groups, obovate, 0.8-4.0 mm long, 1-2 times as long as wide, flat to thickish (but not gibbous), without a green stalk but with a very small white stipe that often decays; margins entire; nerve 1, sometimes indistinct, very rarely longer than the extension of the air spaces, not longer than 2/3 of the distance between the attaching point of the root and the apex; papillae small, present or not on midline; anthocyanin absent; air spaces much smaller than 0.3 mm; the sheath unwinged, the tip rounded or somewhat pointed; turions absent Flowers: rather rare, l-ovulate, the small utricular scale open on one side Fruit: 0.6-1.0 mm long, not winged. SEEDS: with 12-15 ribs Misc: Mesotrophic to slightly eutrophic, quiet waters; below 2100 m (7000 ft); May-Sep Notes: root up to 1.5 cm long REFERENCES: Landolt, Elias. 1992. Lemnaceae. Ariz.-Nev. Acad. Sci. 26(1)2.