Annual (?). Stems very slender, strictly erect, smooth, 15-50 cm by 1-2 mm. Leaves narrowly linear, rather abruptly narrowed to the obtusish tip, glabrous, smooth or minutely scabrid at the top, 1-2(-3)mm wide; sheaths narrow, wingless, glabrous; contraligule very short, glabrous or minutely scabrid-ciliolate. Inflorescence narrow, elongate, consisting of a terminal panicle 1-2 cm long, and 2-3 remote lateral fascicles; terminal panicle not pseudo-lateral, its bract not or but slightly overtopping the inflorescence; peduncles of lateral panicles single or binate at the nodes, setaceous, more or less exserted from the sheaths, smooth or slightly scabrid, often purplish; primary bracts erect, not overtopping the inflorescence. Spikelets unisexual; ♂ spikelets about as long as their peduncles, linear-lanceolate, 2 mm long; stamen 1; anther oblong, ⅔ mm long; ♀ spikelets 4 mm long; glumes ovate, acute or mucronulate. Disk thin, appressed, triangular with rounded angles, hardly lobed, not cellularglandular. Nut shorter than the glumes, subglobose, obtusely trigonous, not or hardly apiculate, smooth or nearly so, very shining, 1⅓-1⅔ mm across.
Wet localities, open grassy ground, at low and medium altitudes, in Thailand up to 1300 m.
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