Marine, submerged, monoecious, perennial herb. Rhizome fleshy, 0.9–1.5 mm diam.; scales obovate, 5–8 mm long, hairy, keeled. Leaves with blade longer than petiole; blade obovate to oblong-elliptic, 15–30 mm long, 5–9 mm wide, finely serrulate, rounded at apex, not membranous, with few stiff hairs; cross veins in 9–14 pairs, occasionally forked. Spathal bracts hairy, 5–10 mm long, enclosing either a male or female flower. Male flowers with pedicel 5.5–7.5 mm long; tepals ovate, 3.5–4.1 mm long; anthers linear, 2.5–3.1 mm long. Female flowers sessile on rhizome nodes; hypanthium 2–3 mm long; tepals 0.2 mm long; ovary 1 mm long; styles 3, 15–25 mm long. Fruit globose, 2.5–5 mm diam. Seeds 18–30, ovoid, 0.5–0.6 mm diam.; testa reticulate.
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