Stems 30-175 cm by 2-4 mm. Leaves practically all reduced to membranous sheaths, only the upper 1-2 very shortly laminate. Inflorescence very dense, (6-)10-12(-16) by 6-8(-10) mm. Spikelets oblong-elliptic, 3-4½ by 1 mm. Glumes ovate-lanceolate, the third 2½-3½ mm long, the fourth 3½-4 mm, both with distinct ferrugineous nerves and smooth or sparsely spinulose keel. Nut oblong or elliptic-oblong, black, 1½-2 by 3/5-¾ mm.
Swamps, wet grassy fields, seepage hollows, open wet places in forests, usually 500-2000 m, sometimes up to 2200 m, one record (S. Sumatra, Lampongs) from 200 m.
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