Rhizomes creeping, 2-4 mm in diam., with elongated internodes. Leaves on non-flowering shoots 5-8, linear, longer than 50 cm, 3-6 mm wide, 5-7-veined, margin entire, apex rounded or mucronate; sheaths closed, tubular, membranous, splitting irregularly when old; auricle ca. 1 mm; ligule ca. 0.5 mm; intravaginal squamules 2 or 4, linear. Flowering stems ca. 1 m, branched; spathes with flattened stalk, narrower than leaves; spadix without projections. Anthers 4-5 mm. Ovary 2-3 mm; style 1.5-2.5 mm; stigmas ca. 3 mm. Fruit ellipsoid, ca. 4 mm. Seeds longitudinally ribbed. Fl. and fr. Mar-Jul. 2n = 12.
A grass like plant that grows in sea water. The leaves are bright green and ribbon like. There are extensive white rhizomes or underground stems. These develop short stems that carry the leaves. The flowers are small and white. They are enclosed in the sheaths of the leaf bracts.