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Genus :


Family :



Stoloniferous or caespitose annual or perennial herbs. Culms erect or procumbent, sometimes floating or submerged, terete to triquetrous, usually smooth. Leaves basal or cauline, bladed or bladeless, blade linear, basal sheaths open, cauline sheaths tubular, ligules membranous or absent. Involucral bracts leaf-like, 2-several. Inflorescence terminal and often pseudolateral, paniculate, simple to decompound. Spikelets solitary, generally small, ovoid or ellipsoid, terete, many-flowered, rachilla persistent, wingless. Glumes spirally imbricate, mostly membranous, acropetally deciduous, the lower 1-3 often empty. Flowers bisexual. Perianth segments 0-6, filiform, sometimes exceeding the subtending glume. Stamens 1-3, anthers linear oblong, with shortly produced, smooth or bristly connective. Style caducous, continuous with ovary, glabrous or fimbriate, stigmas 2-3. Nutlets trigonous or biconvex, obovate or elliptic to oblong, often apiculate, smooth or rugulose, epidermal cells vertically oblong or hexagonal.

Key to the species

Serial Key Reference
1a. Culms cylindric, 5-50 cm long; inflorescences capitate or of 1 spikelet; spikelets elliptic-ovate, 5-12 mm long; nutlets blackish-brown, rugose S. erectus
1b. Culms trigonous, 50-200 cm tall; inflorescence decompound umbel; spikelets ovoid to oblong-ovoid, 2.5-6.0 mm long; nutlets pale brown, smooth S. ternatanus