Dioecious. Stems at the nodes with 1 c. 10 cm long root; internodes 1-5 cm; scars of fallen leaves 3-13 mm spaced. Scales elliptic or ovate, with acute, obtuse or incised apex, keeled, membranous, 3-6 mm, soon caducous. Leaves 10-20 pairs, distichously arranged along a 5-18 cm long shoot, sessile, oblong-linear, serrulate, rounded, glabrous, 10-23 by 2-5 mm, in sicco brown, base semi-amplexicaulous, at one side with an incurved broadening; cross-veins 4-5 pairs, very fine, square, joining the intramarginal nerves; midrib united at the top with the intramarginal nerves. Spathe membranous, outer segment with an acute and an obtuse keel, near the apex faintly serrulate; inner segment with one keel and a long-pointed apex, c. 6-7 mm. Male flower shortly pedicelled, perianth segments elliptic, reflexed, obtuse, with an inconspicuous nerve, 3-4 mm; anthers 4-locular, 1.5 mm, after anthesis caducous. Female flower subsessile; ovary ovate, 3-4 mm, beak 5-6 mm; styles 3-5, 10-12 mm. Fruit ovate, compressed, 4-6 mm, beak 3-5 mm; pericarp membranous. Seeds 20-30, globose, smooth, transparent, c. 1l2 mm.
In shallow water on coral-reefs, but also in deeper water to 6 fathoms, on mud or sandy mud. Sometimes associated with other sea-grasses. Pascasio & Santos Nat. Appl. Sc. Bull. Un. Philip. 1 1930 4 mention the species from the submarine meadows of Thalassia hemprichii, Sinclair collected it among Enhalus in Johore. Fl. fr. March-Oct.
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