Semi-terrestrial. Stem much branched, not more than 5 cm high, rooting at the nodes. Leaves alternate, rarely subopposite. Immersed leaves not known. Aerial leaves entire or rarely ± pinnate with 1-2 filiform segments, 2-4 by 0.2-0.4 mm, with a dark cushion-like thickening above at apex. Flowers solitary in the upper leaf-axils, the upper ♂, the lower ♀. Bracteoles inconspicuous or absent. ♂ Flower nearly sessile. Sepals 0. Petals 2, oblong to lanceolate, flat, entire, acute, erect before anthesis and up to 1 mm long, strongly recurved after anthesis. Stamen 1; filament up to ½ mm; anther elliptic, 0.5-0.9 by 0.3-0.5 mm, mucronate. Rudiment of ovary 0. ♀ Flower sessile. Sepals and petals 0. Styles shortly conical, distally set with long hairs. Fruit 0.5-0.9 mm long. Mericarps 2, oblong, with mostly 2 distinct dorsal crests of 5-7 tubercles over the entire length and some rows of lower tubercles laterally, with a rather indistinct crown of c. short, ± spiny tubercles.
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