Cyperus rotundus L.
  • Sp. Pl.
  • Rundes Zypergras


Cite taxon page as 'WFO (2020): Cyperus rotundus L. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000381487. Accessed on: 25 Nov 2020'

General Information

Perennials. Stolons slender, with ellipsoidal tubers. Culms solitary, rarely 2 laxly tufted, 15-90 cm tall, slightly slender, triquetrous, smooth, base swollen into a tuber, leaved at basal part. Leaves equaling or shorter than culm; sheath brown, usually disintegrating into fibers; leaf blade bluish green, 2-5 mm wide, ± flat. Involucral bracts 2 or 3(-5), longer to sometimes shorter than inflorescence. Inflorescence a simple or compound anthela; rays (2 or)3-10, mostly to 12 cm, unequal in length, spreading. Spikes obdeltoid, with 3-10 slightly laxly arranged spikelets. Spikelets obliquely spreading, linear, 1-3 cm × 1.5-2 mm, 8-28-flowered; rachilla wings white, slightly broad, hyaline. Glumes blood-red to purplish brown on both surfaces but middle green, subdensely imbricate, ovate to oblong-ovate, ca. 3 mm, 5-7-veined (fading some distance before margin), apex acute to obtuse and muticous. Stamens 3; anthers linear; connective prominent beyond anthers. Style long; stigmas 3, longer than style, exserted from glume. Nutlet obovoid-oblong, 1/3-2/5 as long as subtending glume, 3-sided, puncticulate. Fl. and fr. May-Nov. 2n = 80, 84, 96, 100, 104, 108, 110, 112, 116, 124, 132, 138, 160, ca. 200.

  • Provided by: [O].Flora Of CHina @ efloras.org
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    Herbs, perennial, stoloniferous; stolons (2–)5–12 cm × 1–2 mm, bearing tubers 3–8(–12) mm diam., wiry, springy when dried, indurate. Culms trigonous, 10–35(–40) cm × 0.7–3.4 mm, basally indurate, glabrous. Leaves V-shaped to flanged V-shaped, 5–30 cm × 2–6 mm. Inflorescences: spikes 1(–3), broadly ellipsoid, (12–)15–25(–30) × (12–)20–30(–50) mm; rays (3–)4–6(–7), 0.2–10 cm; bracts (2–)3–5, horizontal to ascending at 45°, V-shaped to flanged V-shaped, 0.5–10 cm × 0.5–4 mm; rachilla persistent, wings 0.5–1 mm wide. Spikelets (2–)3–7(–12), compressed, linear, 4–40 × 1.3–1.8 mm; floral scales persistent, 6–36(–42), spreading or appressed, purple to reddish brown, with narrow clear border and green midrib, 7–9-ribbed, ovate, (1.8–)2.6–3.4 × 2.2–3 mm, apex obtuse. Flowers: anthers 1–2.5 mm; styles 1.3–3.5 mm; stigmas (1.8–)2–3.3 mm. Achenes black, sessile, ellipsoid, abaxial face convex, adaxial face concave, 1.4–1.7(–1.9) × 0.8–1 mm, apex obtuse, surfaces puncticulate.

  • Provided by: [J].Flora of North America @ efloras.org
    • Source: [
    • 9
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    17. Cyperus rotundus L., Sp. Pl. 45 (1753). Sintipo: Herb. Hermann 36, v. 1, fol. 3 (BM-SL!).

    Por C.D. Adams.

    Perennes. Tallos hasta c. 40 cm, generalmente solitarios, lisos, duros e hinchados en la base. Estolones firmes, con hojas escamosas pardo oscuro, pronto tornándose alambrinos y quebradizos; tubérculos ovoides, duros. Hojas hasta 30 x 0.6 cm, patentes sobre la base a manera de cáudice de vainas apretadas 1-3(-5) cm, distalmente escabriúsculas. Brácteas generalmente más cortas y estrechas que las hojas. Rayos hasta 10 cm; rayos secundarios no formados regularmente, hasta 10(-18) mm. Espigas ampliamente elipsoides; raquis 3-15 mm, claramente visible. Espiguillas (5-)12-30(-40) x 1.5-2 mm, lineares, comprimidas, agudas, rojizas a pardo-púrpura; raquilla recta, persistente con alas hialinas. Glumas 2.2-3.4 x 2-3 mm, ovado-elípticas, subagudas, persistentes, 7-9-nervias, separadas del margen hialino y cercanas a la costilla media verde, que termina en una punta ligeramente incurvada. Estambres 3. Estilo hasta 3.5 mm. Aquenios 1.3-1.9 x 0.8-1 mm, elipsoides, trígonos, obtusos, sésiles, punticulados. Potreros, céspedes y lugares secundarios. T (Cowan 2486, MEXU); Ch (Breedlove 10622, MICH); Y (Gaumer 2173, K); B (Gentle 4702, NY); G (Deam 6382, E); H (O'Neill 8991, BM); ES (Rohweder 1408, MO); N (Zelaya 2256, F); CR (Mori y Anderson 199, BM); P (Erlanson 332, MICH). 0-1400 m. (Cosmopolita en países cálidos.)

    Una de las malezas más agresivas que existen.

  • Provided by: [D].Flora Mesoamericana
    • Source: [
    • 10
    • 1
    • ]. 

    Cyperus rotundus L., Sp. Pl. 45. 1753.

    Perennes, estolones 2–12 cm de largo con tubérculos elipsoides, 3–12 mm de ancho; culmos triquetros, 10–40 cm de alto. Hojas con láminas en forma de V, hasta 30 cm de largo. Brácteas de la inflorescencia 2–5, horizontales a ascendentes, hasta 10 cm de largo, rayos 3–7, hasta 10 cm de largo, espigas laxamente elípticas, 10–30 mm de largo; espiguillas 2–12, lineares, 4–40 mm de largo y 1.3–1.8 mm de ancho, moradas a café-rojizas, raquilla alada, persistente; escamas 6–36 (42), ovadas, (1.8–) 2.6–3.4 mm de largo y 2.2–3 mm de ancho, medialmente 3–5-nervias, persistentes; estambres 3, anteras 1–2.5 mm de largo; estigmas 3. Fruto (rara vez madurando) trígono, elipsoide, 1.4–1.9 mm de largo y 0.8–1 mm de ancho, obtuso, punteado, negro, sésil.

    Común, maleza en suelos alterados, húmedos a secos, zona pacífica; 0–700 m; fl y fr may–oct; Moreno 8623, Sandino 641; pantropical y subtropical.

  • Provided by: [N].Flora de Nicaragua
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    • 11
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    Perennial, the rhizomes sometimes tuber-bearing; culms slender, 10-60 cm. high, bulbous-thickened at the base; leaves 2-6 mm. wide; bracts usually short; spikes ovate, lax, on rays to 6 cm. long; spikelets linear, 1-2 cm. long, 12- to 30- flowered, rachilla winged; scales purplish, carinate, obtuse, obscurely nerved; achene obovate-ellipsoid, bluntly trigonous, 1.5 mm. long, black, minutely papillose, maturing only infrequently.

  • Provided by: [E].Flora de Panama
    • Source: [
    • 12
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    Plantas perennes, con estolones y tubérculos ovoides, duros; culmos hasta ca. 50 cm, lisos, hinchados en labase. Hojas (4–)8–10(–20), patentes, 5–30 cm; lámina ca. 6 mm de ancho. Infl. con brácteas foliiformes; rayoshasta ca. 10 cm; rayos secundarios 0–1.5 cm; espigas elipsoides. Espiguillas 10–30 × 1.5–2 mm, lineares,agudas, comprimidas; raquilla alada; glumas ovado-elípticas, subagudas, 7–9-nervadas, persistentes, rojizas apardo púrpura. Fls. con 3 estambres. Aquenios 1.3–1.9 × 0.8–1 mm, elipsoides, trígonos, sésiles, punticulados.

  • Provided by: [M].Manual de Plantas de Costa Rica
    • Source: [
    • 13
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    "Perennial with numerous slender rhizomes ending in small tubers; stems 2–5 dm, smooth; lvs basally disposed, mostly shorter than the stem, 3–6 mm wide; bracts few, all or all but one shorter than the infl; rays 3–7, simple or sometimes branched at the top, to 10 cm; spikelets 3–10 in short-cylindric spikes, 10–40-fld, to 4 cm; scales closely imbricate, ovate, 2.5–3.5 mm, obtuse, keeled, 7-nerved (3 in the midvein, 2 nearby on each side), the sides purple-brown or red- brown; rachilla persistent, winged; achenes nearly black, narrowly trigonous-obovoid, 1.5 mm; 2n=108. A weed of sandy soil; pantrop., n. to Va. and Ky., and occasionally adventive farther n."

  • Provided by: [F].New York Botanical Garden
    • Source: [
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    Perennial, 20-60 cm. Rhizome dark brown, woody; stolons numerous, long-creeping, strong, 1-1.5 mm diam., producing tubers, c. 20 x 9 mm, dark brown. Stem 1-2.5 mm diam., trigonous, green, smooth. Leaves shorter than stem; sheaths to 10 cm, wide, acute, grey-brown or brown, sometimes with reddish tint, mouth margin lingulate; blades to 30 cm, 1-4.5 mm wide, grey-green or green, flat or folded, slightly keeled, margins smooth or towards the apex barbed, apex long-attenuate, acute, trigonous, scabrous. Inflorescence an anthelodium, 40-100 mm; 2-3 lowermost bracts foliose, longer than inflorescence; primary branches 5-8, to more than 50 mm long; secondary anthelodia 25-50 mm; clusters of spikes 15-40 mm, of (2-)5-7(-9) spikes on slightly elongated axis, sometimes nearly digitately; spikes 10-40 x 1.5-2 mm, with 11-51 glumes, glume-like bract c. 2 mm, glume-like prophyll 1.9-2.4 mm, bi-nerved, sterile; spike rachis 4-angled, c. 0.5 mm wide, internodes 0.7-1 mm, winged; glumes (2.3-)2.7-3.7 mm, cymbiform, rather closely imbricate, obtuse, dark reddish brown, or grey-brown, sides with two distinct nerves, nerveless area wide, margin narrowly or sometimes widely scarious, towards apex embracing nut. Nut 1.3-1.8 x 0.7-1 mm, ellipsoid or obovoid, trigonous, brown to blackish brown, clearly or obscurely reticulate papillose.

  • Provided by: [L].Flora of Pakistan
    • Source: [
    • 16
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    Morphology

    Common weed

  • Provided by: [H].Plants Of the World Online Portal - FWTA
    • Source: [
    • 2
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    Large spikelets, characteristically dark red-brown, in short spikes

  • Provided by: [H].Plants Of the World Online Portal - FWTA
    • Source: [
    • 2
    • ]. 

    Rounded, fibre-covered tubers at the stem bases

  • Provided by: [H].Plants Of the World Online Portal - FWTA
    • Source: [
    • 2
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    Slender, elongated rhizomes

  • Provided by: [H].Plants Of the World Online Portal - FWTA
    • Source: [
    • 2
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    Tuberous perennial to 15 cm. Spikelets red.

  • Provided by: [K].e-Flora of South Africa
    • Source: [
    • 15
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    Ähnlich wie C. longus, aber nur 10–40 cm hoch, Ausläufer ca. 1 mm dick, im Herbst mit 5–10 mm dicken Knöllchen (bei C. longus Ausläufer 3–10 mm dick, nie mit Knöllchen). Blätter meist weniger als 4 mm breit, Äste des Blütenstan

  • Provided by: [G].Flora Helvetica – Illustrierte Flora der Schweiz
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    Ecology

    Cultivated and other damp places.

  • Provided by: [H].Plants Of the World Online Portal - FWTA
    • Source: [
    • 2
    • ]. 

    7–9. Ufer, feuchte Wegränder, kollin. Südliches TI, VD.

  • Provided by: [G].Flora Helvetica – Illustrierte Flora der Schweiz
    • Source: [
    • 17
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    Habitat

    Disturbed places.

  • Provided by: [K].e-Flora of South Africa
    • Source: [
    • 15
    • ]. 

    Distribution

    Waste places in all tropical and subtropical regions of both hemispheres.

  • Provided by: [E].Flora de Panama
    • Source: [
    • 12
    • ]. 

    Oudtshoorn, widespread weed of cultivation [under-represented in herbarium collections].

  • Provided by: [K].e-Flora of South Africa
    • Source: [
    • 15
    • ]. 

    Distribution Map

     
    • Native distribution
    Found in
    • Southern America Brazil Acre
    • Amapí
    • Amazonas
    • Parí
    • Rondônia
    • Roraima
    • Tocantins
    • Alagoas
    • Bahia
    • Ceará
    • Maranh
    • Paraába
    • Pernambuco
    • Piauá
    • Rio Grande do Norte
    • Sergipe
    • Paraní
    • Rio Grande do Sul
    • Santa Catarina
    • Espirito Santo
    • Minas Gerais
    • Rio de Janeiro
    • São Paulo
    • Brazilia Distrito Federal
    • Goiás
    • Mato Grosso
    • Mato Grosso do Sul

    Synonyms

    Other Local Names

    NameLanguageCountry
    Rundes ZypergrasGermanCH
    Zigolo infestanteItalianCH
    COQUITO, COYOLILLO.
    Souchet rondFrenchCH
    Purple nut-sedge, coco-grass

      Bibliography

     Information From

    Cyperaceae
    • A CC0 1.0 Universal (CC0 1.0).
    MBG Floras Images
    http://www.tropicos.org/ImageSearch.aspx
    Flora images. Missouri Botanical Garden. Accessed on Jun. 2018.
    • B Missouri Botanical Garden
    • C Missouri Botanical Garden
    Flora Mesoamericana
    http://www.mobot.org/MOBOT/fm/
    Gerrit Davidse, Mario Sousa Sánchez, A. O. Chater, Universidad Nacional Autónoma de México. Instituto de Biología, Missouri Botanical Garden, Natural History Museum (London, England) UNAM, 1994
    • D Missouri Botanical Garden
    Flora de Panama
    http://www.tropicos.org/Project/PAC
    Robert E. Woodson, Jr. and Robert W. Schery Annals of the Missouri Botanical Garden Vol. 67, No. 4 (1980), pp. ii-xxxiii
    • E Missouri Botanical Garden
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • F Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    Flora Helvetica – Illustrierte Flora der Schweiz
    http://www.flora-helvetica.ch
    Flora Helvetica – Illustrierte Flora der Schweiz, Konrad Lauber, Gerhart Wagner, Andreas Gygax. Haupt Verlag 2018.
    • G All Rights Reserved
    Plants Of the World Online Portal - FWTA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • H The Trustees of the Royal Botanic Gardens, Kew
    Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    http://floradobrasil.jbrj.gov.br
    Brazil Flora G (2014): Brazilian Flora 2020 project - Projeto Flora do Brasil 2020. v393.147. Instituto de Pesquisas Jardim Botanico do Rio de Janeiro. Dataset/Checklist. doi:10.15468/1mtkaw
    • I Group Brazil Flora, REFLORA Program
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    http://www.efloras.org/flora_page.aspx?flora_id=1
    'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • J Flora of North America Association
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    e-Flora of South Africa. v1.21. 2018. South African National Biodiversity Institute. http://ipt.sanbi.org.za/iptsanbi/resource?r=flora_descriptions&v=1.21
    • K All Rights Reserved
    Flora of Pakistan
    http://www.tropicos.org/Project/Pakistan
    Flora of Pakistan. Missouri Botanical Garden. Accessed on Jun. 2020.
    • L Missouri Botanical Garden
    Manual de Plantas de Costa Rica
    http://www.tropicos.org/Project/Costa%20Rica
    Hammel, B. E.; Grayum, M. H.; Herrera, C.; Zamora, N. Manual de Plantas de Costa Rica. Missouri Botanical Garden Press, 2003-2014
    • M Missouri Botanical Garden
    Flora de Nicaragua
    http://www.tropicos.org/projectwebportal.aspx?projectid=7&pagename=Home&langid=66
    WD Stevens, CU Ulloa, A Pool and OM Montiel. Missouri Botanical Garden Press, 2001
    • N Missouri Botanical Garden
    Flora Of CHina @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=2
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • O Missouri Botanical Garden
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • P CC0 1.0 Universal (CC0 1.0).
    International Union for Conservation of Nature v.3
    https://www.iucnredlist.org/
    IUCN 2019. The IUCN Red List of Threatened Species. Version 2019-1.
    • Q See IUCN Terms and conditions of use http://www.iucnredlist.org/info/terms-of-use
    International Union for Conservation of Nature
    https://www.iucn.org/
    IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
    • R All Rights Reserved