Cyperus L.

Culms distinctly 3-angular Cyperus

Style 2-fid. Nut compressed, biconvex or plano- or concavo-convex

Spikelets 1-4 flowered. Rhachilla articulate above the 2 lowest sterile glumes, spikelet falling away as a unit at maturity leaving a knob or protuberance on the rhachis. Inflorescence a dense globular to ovoid or cylindrical capitate spike

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Tufted annual. Rhizome absent or very short. Spike whitish or very pale green, ovoid to oblong-cylindrical, 6–12 mm long, often with 2 smaller ones at its base. Nut finally black. Culms up to 30 cm high. Widespread. Grasslands. Introduced status uncertain. Cyperus sesquiflorus

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Perennials with creeping rhizomes