*Cyperus dubius Rottb.

Glumes obtuse, 2.5–4 mm long, 7–9 nerves per side, light to straw-coloured. Spikelet 3–6 flowered. Bases of culms enlarged by leaf sheaths. Tufted perennial with a short rhizome. Disturbed areas. Introd. from Africa and Asia. Fl. spring–summer