Cyperus rotundus L. it is a perennial herb with long slender stolons, swollen into small ellipsoid, black tubercules. Stems erect slender, rigid, up to 15-40 cm long, triquetrous, glabrous and smooth, densely leafy at the base, slightly thick at the basal portion and surrounded by marcescent brownish to whitish sheaths. Leaves 3-12, all basal, usually shorter, sometimes equalling to longer than the stem, rigid, 2-6 mm wide, acute, glabrous, only scabrous towards the margins and the keel, bracts2-6 (8) equal to longer than the inflorescence. Inflorescence simple or compound umbel, loose, rays 3-11, unequal, 1.5-6 cm long, subtended by scaly bract at the base, each umbel ray consists of 3-11 spikes forming a corymb-like sub inflorescence. Spikes linear or linear-lanceolate, acute, 10-20 x 1.5·2 mm, consists of many flowers up to 100; rachis winged. Glumes densely imbricate, ovate, 3-4 x 1.5-2 mm, 7 nerved brownish-red or dull yellow in colour, margins narrowly hyalinous, and with green nerved keel. Stamens 3, anthers linear, yellow 1.5-2 mm long, the connective prolonging into oval reddish appendix, c. 1̸2 mm long. Style long slender. Stigmas 3, long. Achene up to 2̸3 of the size of glume, obovate-sub globose, trigonous, c. 1.2-1.5 x 0.8-0.9 mm, brown to blackish, very shortly apiculate.
Flowering in: May-Dec.
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