Cyperus longus L., it is a perennial green herb. Rhizome, ± long, creeping, indurated, robust, stiff, sometimes branching. Stem 40-100 cm, triangular, glabrous, sheathed and leafy only at the base. Leaves shorter than the stems about 30 x 0.4-0.7 cm, keeled towards back, scabrous at margin and keel, acute, dark greenish, leafy bracts 3-6, longer than the inflorescence. Primary inflorescence compound, loose with 6-10 unequal rays, 20 cm long, triangled, subtended by whitish leafy bract at the base. Secondary rays setaceous, unequal, up to 10 cm long. Primary spikelets congested, of 3-12 secondary spikelets. The last ones nearly sub erect, linear, acute (0.7) 1-1.5 x 1-1.5 mm, slightly compressed 8 (12)-3-flowered. Rachis winged, the wings lanceolate, margins whitish, persistent. Glumes ± densely imbricate, membranous 1.5-2.5 mm long, ovate, obtuse, mucronate with green keel, fuscescen, 5-7-nervcd with ± white hyalinous margins. Stamens 3, linear, yellow, the connective prolonging into appendix. Style long. Stigmas 3. Achene 1̸3 to 1̸2 of the glume length, reddish-brown, oblong or oblong obovate.
Flowering in: Apr -Sep.
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