Eleocharis R.Br. >

Leaves reduced to scales sheathing the base of the culms Eleocharis
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Culms transversely septate only or not septate. Glumes with a few nerves only or nerveless either side of midrib
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Culms transversely septate
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Glumes hardened on the back, with a distinct side vein. Spikelets cylindrical, 3–5 cm long, acute. Nut lenticular. Plants up to 2 m high. Widespread. Ponds and swamps. Tall Spike Rush Eleocharis sphacelata