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Cyperus rotundus

AgroAtlas - Weeds - Cyperus rotundus L. - Cyperus Round Family Cyperaceae, genus Cyperus L. Underground shoots carry numerous tuberose thickenings helping plants to breed. Stems 7-35 (50) cm high, usually single, with basal leaves, triquetrous, glabrous. Leaves linear, glabrous, 2.5 mm wide, usually with short vaginas, aggregated at base of stem. Inflorescence is umbel-shaped, with unequal rays of 0.3-10 cm in length bearing apical friable bunches of spikes; the spikes oblong-linear, 10-20 mm in length and 1-2 mm in width; 2-3 basal leaves considerably exceed inflorescence in length. Style with stigmas 6-7 mm in length. Nutlet triquetrous, grayish-brown, about 1.5 mm in length. The seeds have long period of germination (since April till September) and very low germinating capacity (fresh-mature seeds to 6-7%). After winter the germinating capacity increase to 50-80%. The seeds germinate in lower places under sufficient moisture. Viability of seeds is to 10 years. Seedlings develop slowly in first 20-30 days of life and may be easily abolished by cultivators. First fruits form in the beginning of June. Tubers penetrate into soil to 80-100 cm deep (but they are mostly located at a depth to 20 cm). Over-ground shoots develop only from young tubers located in soil at a depth to 5-6 cm. One plant is able to form about 10 000 seeds and to 100 tubers during a vegetation period. V (VI)-VII (X).

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