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Free-floating aquatic.. Thallus orbicular-ovate, 3–8 mm. long, almost as broad, with 5–11 conspicuous nerves, sometimes tinged pink above, usually purplish beneath.. Daughter thallus budding from near point of root-insertion in a slit in the mother thallus.. Roots 5–15, arising from greatly thickened basal part of thallus; root-cap acute.. Rootless resting bud (turion) produced in adverse conditions, 2 mm. in diameter.. Flowers seldom produced, surrounded by a small open spathe in a lateral slit-pouch, with 1 pistillate flower, and 2–3 staminate flowers each consisting of a single stamen.. Fruit slightly wing-margined.. Seeds 1–2.. Fig. 2/1.
Fronds obovate to circular, 2–10 mm long, 1–1.5 times as long as wide, rounded or pointed at apex, flat or rarely slightly gibbous, sometimes with red spot in centre of upper surface; nerves 7–16 (–21). Turions sometimes present, without roots, disc-shaped to reniform, 1–2 mm diam., brownish to olive. Roots 7–21, to 3 cm long, with 1 or 2 perforating the scale. Flowers (very rare) 1-or 2-ovulate. Fruit 1.0–1.5 mm long, with lateral wings towards top. Seeds with 12–20 distinct ribs.
Roots 7--21, to 3 cm, 1 or 2 perforating scale. Fronds obovate to circular, flat or rarely gibbous, 2--10 mm, 1--1.5 times as long as wide, apex rounded or pointed, upper surface sometimes with red spot in center; veins 7--16(--21); turions sometimes present, rootless, brownish olive, circular-reniform, 1--2 mm diam. Flowers: ovaries 1--2-ovulate. Fruits 1--1.5 mm, laterally winged to apex. Seeds with 12--20 distinct ribs. 2n = 30 , 38, 40, 50, 80.
Fronds obovate to orbicular, 3-10 mm, 1-1.5 × as long as wide, flat, rarely gibbous, sometimes with indistinct papillae on upper surface along veins. Roots (5-)7-21, 1(or 2) perforating scale, 0.5-3 cm. Turions sometimes present, without roots, brownish to olive, orbicular to reniform, 1-2 mm. Ovary with 1 or 2 ovules. Fruit laterally winged toward apex. Seed with 12-20 ribs. Fl. (very rare) Jun-Sep. 2n = 30, 32, 38, 40*, 50, 80.
Perennial, aquatic herb. Roots 7-21. Fronds ovate to ± circular, 1.0-1.5 x as long as wide, upper surface without papillae; veins 7-16(-21).
Floating herb with roundish thallus grouped in colonies, often covering large areas of water
Thallus green or pink tinged above, pink beneath.
