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
Perennials with creeping rhizomes
Glumes purplish-brown. 2–4 flowers per spikelet. Stamens 3. Inflorescence obovate, with several densely clustered heads of spikes, purple to black in colour. Culms triangular, involucral bracts 3- 5 up to 24 cm long, often reflexed. Spikelets 3–5 mm long. Glumes with smooth or toothed midrib, sides with several nerves. Nut about half as long as glumes. Herb with long stolons. Possible serious environmental weed. Blue Mts Creeklines. Introd. from Africa. Fl. summer Cyperus teneristolon
Glumes light to pale brown. 1 or 2 flowers per spikelet. Stamens 1, 2 or 3