Marine, occasionally estuarine, submerged, annual herb. Rhizome 1 mm diam.; scales suborbicular to obovate, keeled, 3–4 mm long. Lateral shoot 80–180 mm long, occasionally branched. Leaf blade linear-oblong, 12–20 mm long, 2–4 mm wide, sparsely serrulate, obtuse, glabrous; midrib conspicuous; cross veins in 2 or 3 pairs. Male flowers with pedicel to 0.5 mm long; tepals 3–4 mm long; anthers linear-oblong, 2.5–3 mm long. Female flowers with hypanthium 3 mm long; tepals 0.1 mm long; ovary ovoid, 0.5–1 mm diam.; styles 5 or 6, 10 mm long. Fruit ovoid, 4 mm diam. Seeds c. 25–60, globose, 0.35–0.45 mm diam.; testa papillate.
Found between 1.4 m and 54 m deep on muddy substrate,near mangrove wetland and estuaries, and on coral sand in lagoons of the GreatBarrier Reef.
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