Scleria rugosa R.Br.

Annual. Stems slender, obliquely erect or de-cumbent, smooth, (5-)10-30(-40) cm by ½-1½ mm. Leaves rather abruptly narrowed to the obtusish tip, from glabrous to densely pubescent with pale, patent hairs, smooth, 2-4 mm wide; sheaths loose, from sharply triquetrous to distinctly winged; contraligule short, semi-orbicular, ciliate. Inflorescence narrow, elongate, consisting of a terminal (but pseudo-lateral) panicle and 1-2 lateral, remote fascicles of panicles not markedly different from the terminal one; panicles single or binate at the nodes, on stout, often recurved peduncles; primary bracts erect, the upper one as though continuing the stem, distinctly overtopping the inflorescence. Spikelets unisexual; ♂ spikelets shortly peduncled, lanceolate, c. 2 mm long; stamen 1; anther oblong, ½-⅔. mm long; ♀ spikelets 3-4 mm long; glumes ovate, acute or mucronulate, usually long-ciliate on the keel, rarely glabrous; a sterile glume besides the ♀ flower sometimes present. Cupula hardly lobed, ⅔ mm wide. Disk thick, appressed, shallowly 3-lobed, densely cellular-glandular; lobes obtuse, semi-orbicular. Nut shorter than the glumes, globose or slightly depressed, terete, apiculate, smooth or more or less rugulose to lacunose especially in the upper half, often somewhat tuberculate at the top, shining, white or finally greyish, 1⅓-14/5 across.

Open swampy places, savannahs, fallow rice-fields, rice-field dikelets, damp road-sides, at low altitudes, up to 500 m.