Marine, occasionally estuarine, submerged, dioecious, perennial herb. Rhizome fleshy, 1–2 mm diam.; scales glabrous. Leaves with petiole to 10 cm long; blade linear-lanceolate to narrowly elliptic, 25–70 mm long, 6–15 mm wide, entire, obtuse, glabrous; cross veins 10–16 pairs, forked. Spathal bracts 4–7 mm long. Male flowers with pedicel to 20 mm long at anthesis; tepals 5–7 mm long, imbricate, hooded; anthers oblong, 2.5–3 mm long. Female flowers on erect extended lateral shoots 5–15 cm long, with paired leaf blades 3–5 cm long; lateral shoots sometimes producing successive flowering shoots. Female flowers sessile; hypanthium 2–5 mm long; tepals 0.5–1 mm long; ovary ovoid, 1–2 mm long; styles 6, 6–20 mm long. Fruit ovoid, 7–13 mm diam. Seeds 40–60, subglobose, 0.5–0.75 mm diam.; testa reticulate.
Home