Marine, submerged, perennial, dioecious herb. Rhizome 1–1.5 mm diam.; scales elliptic or ovate, 3–6 mm long, acute or obtuse. Lateral shoots 20–120 cm long, occasionally branched, with leaf scars from shed leaves. Leaf blade oblong to linear, 5–20 mm long, 1.5–3.5 mm wide, serrulate, rounded at apex, glabrous, with basal portion of one side of blade folded upwards; cross veins in 4 or 5 pairs. Male flowers shortly pedicellate; tepals elliptic, 3–4 mm long, obtuse, reflexed; anthers linear-oblong, 2.5–3 mm long. Female flowers with hypanthium 5–6 mm long; tepals 0.1 mm long; ovary ovoid, 1–2 mm diam.; styles 3–5, 10–12 mm long. Fruit ovoid, 4–6 mm diam. Seeds 20–30, globose, 0.75 mm diam.; testa reticulate.
Thisspecies has been found from the level of mean low-water springs down to about45 m in depth on coral platforms, coral sand to muddy sand substrate. Inshallow water it is mixed with other seagrasses such as Thalassia, Enhalus, Halodule spp., Cymodocea spp. and Halophila spp. whereas in deep waterit is often mixed with Halophila ovalis.
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