Prostrate and often mat-forming, sometimes submerged herb, with stems 5–15 cm long.. Leaves spathulate or elliptic, up to 8(–10) mm long and 2–5 mm wide, usually 3-veined; petiole 1.5–3 mm long, 1-veined.. Flowers solitary, bracteoles 1–2, ± 2 mm long, narrow; stamens 4–8 mm long, anthers ± 0.5 mm long; styles up to 1.5 mm long.. Fruit 1.2–1.5 mm long and 1.6–2 mm wide, unwinged, but with distinctly edged margins.. Pollen reticulum meshes as wide as the clavae; clavae obtusely triangular, surface almost smooth.. Fig. 1/9–10 (p. 3).
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