Eleocharis R. Br.
  • Prodr. 1: 224. 1810.
  • Spike-rush, spikesedge, éléocharide [Greek heleios, dwelling in a marsh, and charis, grace]

Cite taxon page as 'WFO (2021): Eleocharis R. Br. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-4000013172. Accessed on: 17 Oct 2021'

General Information

Herbs, perennial or annual. Rhizomes short or absent; stolons usually present. Culms tufted or single. Leaves bladeless; sheath apiculate or rarely with a scarious appendage at apex. Inflorescences reduced to a single terminal spikelet, erect, rarely proliferous (bearing plantlets) at base, with few to many bisexual flowers. Glumes spirally imbricate or rarely distichous, oblong, oblong-ovate, lanceolate, or subrounded, firm or membranous, glabrous, usually with a midvein although sometimes indistinct but with lateral veins, margin usually hyaline; basal 1 or 2 glumes usually empty. Perianth bristles (3-)6(-12) or rarely absent, retrorsely spinulose. Stamens 1-3. Style thin; stigmas 2 or 3. Nutlet obovoid, broadly obovoid, or globose-obovoid, 3-sided, biconvex, or plano-convex, smooth, reticulate, cancellate, or rarely pitted; persistent style base expanded, triangular, conic, or variously shaped, sometimes spongy-thickened.

  • Provided by: [G].Flora Of CHina @ efloras.org
    • Source: [
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    22. Eleocharis R. Br.

    Por M. Socorro González E.

    Chaetocyperus Nees, Eleogenus Nees, Scirpidium Nees.

    Anuales o perennes, acuáticas o de suelos húmedos. Tallos simples. Hojas reducidas a vainas en la base del tallo. Inflorescencia una espiguilla solitaria, terminal, ebracteada. Glumas espiralmente imbricadas, raramente subdísticas, glabras, casi siempre 1-3 estériles en la base de la espiguilla. Flores bisexuales; perianto de cerdas reducidas o a veces ausente; estambres (1-)3; estilo 2 o 3-fido, la base dilatada y persistente sobre el aquenio, formando un tubérculo. Aquenios biconvexos o triquetros, en ocasiones muy obtusa, apareciendo aplanado-convexos o de sección circular. Aprox. 150 spp. Cosmopolita.

    En todas las descripciones, la medida del aquenio incluye el tubérculo.

    Bibliografía: Svenson, H.K. Rhodora 31: 121-135 (1929a); 152-163 (1929b); 167-191 (1929c); 199-219 (1924d); 224-242 (1929e); 34: 193-203 (1932a); 215-227 (1932b); 36: 377-389 (1934); 39: 210-231 (1937a); 236-273 (1937b); 41: 1-19 (1939a); 43-77 (1939b); 90-110 (1939c); N. Amer. Fl. 18: 509-540 (1957).

  • Provided by: [I].Flora Mesoamericana
    • Source: [
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    Por Socorro González-Elizondo

    Anuales o perennes, acuáticas o de suelo húmedo; culmos simples; plantas hermafroditas. Hojas reducidas a vainas en la base del culmo. Inflorescencia una espiguilla solitaria, terminal, sin brácteas; escamas glabras; perianto reducido a cerdas o a veces ausente; estambres (1–) 3; estilo bífido o trífido, con la base dilatada y persistente sobre el aquenio formando un tubérculo. Aquenio biconvexo o de sección triangular, en ocasiones muy obtusamente, apareciendo plano convexo o de sección circular.

    Género cosmopolita con ca 200 especies; 24 especies se conocen en Nicaragua y 1 adicional se espera encontrar. Las medidas dadas para el fruto incluyen el tubérculo.

    H.K. Svenson. Monographic studies in the genus Eleocharis. Rhodora 31: 121–135, 152–163, 167–191, 199–219, 224–242. 1929, II. 34: 193–203. 1932, IV. 39: 210–231, 236–273. 1937, V. 41: 1–19, 43–77. 1939.

  • Provided by: [D].Flora de Nicaragua
    • Source: [
    • 6
    • ]. 

    Plants annual or perennial, the culms simple, terete or angulate, leafless; spike- let solitary, terminal, erect, few- to many-flowered, not involucrate, the scales spirally imbricate; perianth of 1-6 bristles, frequently wanting; stamens 1-3; style 2- to 3-cleft; achene biconvex or 3-angulate, the style base usually persistent as a tubercle.

  • Provided by: [C].Flora de Panama
    • Source: [
    • 7
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    Plantas anuales o perennes, semiacuáticas o acuáticas; culmos simples. Hojas reducidas a una vaina basalsin lámina. Infl. una sola espiga terminal, ebracteada. Espiga con glumas espiralmente imbricadas a subdísti-cas, cartilaginosas o membranáceas, las 1–3 basales estériles. Fls. bisexuales, sin perianto, o con perianto de1–8 cerdas; estambres 1–3; estilo bí o trífido, que forma un tubérculo persistente sobre el aquenio. Frs. (aque-nios) biconvexos o triquetros.

  • Provided by: [F].Manual de Plantas de Costa Rica
    • Source: [
    • 8
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    • ]. 

    Herbs, annual or perennial, usually cespitose, often rhizomatous, sometimes stoloniferous; rhizomes rarely with terminal tubers or bulbs, horizontal and long or ascending and caudexlike. Culms sometimes solitary, terete, 3–5-angled or more, or strongly compressed in cross section, spongy with internal air cavities and incomplete transverse septa or sometimes hollow with complete transverse septa. Leaves basal, 2 per culm; ligules absent; blades absent or a mucro or awn (tooth) at apex of sheath, very rarely flattened, to 6 cm. Inflorescences terminal; spikelet 1; involucral bracts absent, rarely a proximal scale of spikelet resembling short bract. Spikelets: scales 4–500 or more, spirally or rarely distichously arranged, each subtending flower or proximal 1–2(–3) empty, stramineous (straw-brown) to medium brown or red brown or blackish brown. Flowers bisexual; perianth of (0–)3–6(–10) bristles, straight or curved, shorter than to 2 times longer than achene, retrorsely (to antrorsely) spinulose or sometimes smooth; stamens 1–3; styles linear, 2–3-fid, base (tubercle) usually persistent, usually enlarged, usually different in appearance from achene. Achenes biconvex, plano-convex, or trigonous to subterete.

  • Provided by: [E].Flora of North America @ efloras.org
    • Source: [
    • 9
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    "Spikelet solitary, terminal, ovoid to linear, terete or somewhat flattened, few–many-fld; scales spirally imbricate (rarely distichous), often deciduous at maturity, the lower 1–3 empty in most spp., the others floriferous; fls perfect; stamens 1–3; style 2–3-cleft, its expanded base (tubercle) usually enlarged at maturity and persisting on the lenticular or trigonous achene; bristles typically 6, occasionally more, often reduced in number or size, or lacking; herbs of water or wet soil; stems simple, erect to prostrate, the lvs basal, reduced to bladeless sheaths. 150, cosmop. (Heleocharis) The diffuse centromere may contribute to the frequent infraspecific variation in chromosome number."

  • Provided by: [H].New York Botanical Garden
    • Source: [
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    Egorova, T. V. 1981. Generis Eleocharis (Cyperaceae) florae URSS systema et conspectus. Novosti Sist. Vyssh. Rast. 18: 95–124. González-E., M. S. and P. M. Peterson. 1997. A classification of and key to the supraspecific taxa in Eleocharis (Cyperaceae). Taxon 46: 433–449. González-E., M. S., P. M. Peterson, and I. Granzow-de la C. 1997. A cladistic and phenetic analysis of the Pauciflorae group of Eleocharis (Cyperaceae). BioLlania, Ed. Esp. 6: 341–368. González-E., M. S. and J. A. Tena-F. 2000. Eleocharis (Cyperaceae) in the New World. In: K. L. Wilson and D. A. Morrison, eds. 2000. Monocots: Systematics and Evolution. Melbourne. Pp. 637–643. Kukkonen, I. 1990. On the genus Eleocharis (Cyperaceae) in the Flora Iranica area, with revised infrageneric classification and nomenclature. Ann. Bot. Fenn. 27: 109–117. Roalson, E. H. and E. A. Friar. 2000. Infrageneric classification of Eleocharis (Cyperaceae) revisited: Evidence from internal transcribed spacer (ITS) region of nuclear ribosomal DNA. Syst. Bot. 25: 323–336. Smith, S. G. 2001. Taxonomic innovations in North American Eleocharis (Cyperaceae). Novon 11: 241–257. Strandhede, S.-O. and R. Dahlgren. 1968. Drawings of Scandinavian plants 9–16. Eleocharis R. Br. Bot. Not. 121: 1–10, 145–152, 305–311, 465–470. Svenson, H. K. 1929. Monographic studies in the genus Eleocharis. I. Rhodora 31: 121–135, 152–163, 167–191, 199–219, 224–242. Svenson, H. K. 1932. Monographic studies in the genus Eleocharis. II. Rhodora 34: 193–203, 215–227. Svenson, H. K. 1934. Monographic studies in the genus Eleocharis. III. Rhodora 35: 377–389. Svenson, H. K. 1937. Monographic studies in the genus Eleocharis. IV. Rhodora 39: 210–231, 236–273. Svenson, H. K. 1939. Monographic studies in the genus Eleocharis. V. Rhodora 41: 1–19, 43–47, 90–110.

  • Provided by: [E].Flora of North America @ efloras.org
    • Source: [
    • 9
    • ]. 

    Included Species

    Other Local Names

    Spike-rush, spikesedge, éléocharide [Greek heleios, dwelling in a marsh, and charis, grace]


     Information From

    • A CC0 1.0 Universal (CC0 1.0).
    MBG Floras Images
    Flora images. Missouri Botanical Garden. Accessed on Jun. 2018.
    • B Missouri Botanical Garden
    Flora de Panama
    Robert E. Woodson, Jr. and Robert W. Schery Annals of the Missouri Botanical Garden Vol. 67, No. 4 (1980), pp. ii-xxxiii
    • C Missouri Botanical Garden
    Flora de Nicaragua
    WD Stevens, CU Ulloa, A Pool and OM Montiel. Missouri Botanical Garden Press, 2001
    • D Missouri Botanical Garden
    Flora of North America @ efloras.org
    '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.
    • E Flora of North America Association
    Manual de Plantas de Costa Rica
    Hammel, B. E.; Grayum, M. H.; Herrera, C.; Zamora, N. Manual de Plantas de Costa Rica. Missouri Botanical Garden Press, 2003-2014
    • F Missouri Botanical Garden
    Flora Of CHina @ efloras.org
    '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.
    • G 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.
    • H Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    Flora Mesoamericana
    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
    • I Missouri Botanical Garden
    World Flora Online consortium
    World Flora Online Data. 2018.
    • J CC0 1.0 Universal (CC0 1.0).