Halophila beccarii Asch.

Monoecious. Stems thin, at the nodes with 1 root; internodes 1-2 cm. Scales embracing the stem, one 4-6 by 1.5 mm, the other 2-3 mm. Leaves lanceolate, broad-acute at the apex, cuneate at the base, 6-11 by 1-2 mm, glabrous, brown when dry, entire, 6-10 very closely together on a 1-1.5 cm long erect shoot; midrib broad, reaching the margin in the apex; intramarginal nerves originating from the midrib just above the base and joining again just under the apex, cross-veins absent; petiole 1-2 cm, sheath 3-4 mm long with a strongly broadened scarious margin. Spathe oblong-lanceolate, acute, convex, entire, 2.5 mm, containing 1 male and 1 female flower. ♂ Flowers not seen, female ones only partly; ovary 1 mm, beak 2 mm; styles 2 or 3; ovules 2-4. Fruit ovate, recurved after anthesis, pericarp membranous. Seeds 1-4, ovate, acute, inflated, 0.5-1 mm, testa reticulate.

In shallow brackish water, in inundated muddy localities near river-mouths (Sarawak) or in fish-ponds (Luzon), covering the bottom, and abundant locally.