Stem 10–35 cm long in water or 3–20 cm long on mud.. Leaves submerged, floating or aerial, elliptic to spathulate, up to 11 mm long and 5 mm wide but often much smaller, 3–7-veined; petiole usually 3-veined.. Flowers solitary, in the axils of leaves; bracteoles 2, falcate; stamens at dehiscence 1–2 mm, after dehiscence up to 7 mm long; anthers 0.5–0.6 mm long; styles up to 2 mm long, erect or spreading.. Fruit suborbicular, 1.6–1.8 mm long and 1.6–2 mm wide, with a distinct, symmetrically winged mericarp.. Pollen reticulum not as wide as the clavae; clavae irregularly triangular, surface uneven.. Fig. 1/1–4 (p. 3).
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