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Submerged, rhizomatous, aquatic perennial herb. Stem terete, to 4.5 m long; turions terminal on branches. Stipules forming funnel-shaped truncate sheath up to 5 mm long, often disintegrating. Leaves sessile, linear to narrowly oblong, 5.5–11 cm long, c. 0.5 cm wide, amplexicaul at base; margins simple, rarely slightly undulate in lower 25%; apex obtuse to mucronate; veins 3–5, faint; air lacunae on either side of midvein. Inflorescence terminal or axillary, a cylindric spike. Peduncles erect or recurved. Fruit abaxially rounded, laterally compressed, 3.5–4.5 mm long (including beak), smooth with 3 faintly crenulate dorsal keels.
Leaves all submersed, sessile, linear-oblong, 2-5 mm wide, flat, with numerous fine longitudinal nerves; stipules free, disintegrating into fibres. Spike to 1.5 cm long, dense. Achenes flattened with ± 3-ridged keel, beak well-developed, curved.
