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A plant that keeps growing from year to year. It can be under the water or floating. The stalks are 7 m long. They are 1 cm across and are spongy. There are fibrous roots from the nodes. It stands 1-2 m out of the water. The leaf blades are 30-100 cm long by 6-19 mm wide. There are 1-12 flower stalks each 10-30 cm long. The spikelets do not have stalks.
Perennial; culms submerged or floating, up to 7 m long and 1 cm in diameter, spongy, with fibrous roots from the nodes, standing 1–2 m out of the water.
Sessile spikelet narrowly ovate; inferior glume 2–4 cm long, the body 6–8 mm long, yellowish with green tail.
Perennial, the spongy culms submerged or floating, rooting from the submerged nodes
Pedicelled spikelet a little smaller than the sessile.
Leaf laminas 30–100 cm × 6–18 mm, linear.
Racemes 1–12, each 10–30 cm long.
