Overview

Comprehensive Description

Description

Annual or perennial, glabrous herbs. Stolons often present in perennials. Culms ranging from 1-2 cm to 150 cm, green, terete, angular or triangular, hollow or filled with pith, smooth or ridged, rarely with transverse septa (E. dulcis). Sheaths pale, tubular, truncate above or ending in a short lobe. Leaves 0. Inflorescence a single terminal spikelet. Lowest 1-2 glumes similar to or different from upper. Glumes spirally arranged, usually numerous; margin often transparent. Perianth segments 3-9 glabrous or barbellate bristles or 0. Stamens 1-3. Nutlet with the style base persistent as an appendage (the style base excluded in all nutlet measurements).
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© Mark Hyde, Bart Wursten and Petra Ballings

Source: Flora of Zimbabwe

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Ecology

Habitat

Depth range based on 68 specimens in 11 taxa.

Environmental ranges
  Depth range (m): 1 - 1
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Associations

Foodplant / saprobe
effuse colony of Coremiella dematiaceous anamorph of Coremiella cubispora is saprobic on Eleocharis
Remarks: season: 7-10

Foodplant / feeds on
larva of Donacia thalassina feeds on root of Eleocharis
Remarks: Other: uncertain

In Great Britain and/or Ireland:
Foodplant / gall
Physoderma heleocharidis causes gall of live stem of Eleocharis

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records: 458
Specimens with Sequences: 351
Specimens with Barcodes: 198
Species: 167
Species With Barcodes: 100
Public Records: 72
Public Species: 32
Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Barcode data

Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Wikipedia

Eleocharis

Eleocharis is a virtually cosmopolitan genus of 250 or more species of flowering plants in the sedge family, Cyperaceae.[2] The name is derived from the Greek words ἕλειος (heleios), meaning "marsh dweller," and χάρις (charis), meaning "grace."[3] Members of the genus are known commonly as spikerushes, although spikesedges is a more technically appropriate name and most scientists who study them in earnest refer to them as such. The genus has a geographically cosmopolitan distribution, with centers of diversity in the Amazon Rainforest and adjacent eastern slopes of the South American Andes, northern Australia, eastern North America, California, Southern Africa, and subtropical Asia. The vast majority of Eleocharis species grow in aquatic or mesic habitats from sea level to higher than 5,000 meters in elevation (in the tropical Andes).[4]

The genus itself is relatively easy to recognize; all Eleocharis species have photosynthetic stems but no green leaves (the leaves have been reduced to sheaths surrounding the base of the stems). Many species are robust, rhizomatously-spreading plants of lowland tropical wetlands, while many others are small caespitose annual or perennial herbs growing near streams, and still others are intermediate. There are also a number of species that are obligate aquatic species, which usually have submerged, branching stems and often exhibit interesting photosynthetic adaptations, such as the ability to switch between C3 and C4 carbon fixation in response to different environmental stimuli. In all Eleocharis species, the flowers are borne on unbranched terminal spikelets at the apices of stems.[5][6][7][8]

In spite of the diversity of the genus itself, taxonomic characters useful for delimiting species within it are few, and many species are very difficult to tell apart. Many currently recognized species with very wide geographic ranges are highly polymorphic. Some of these species probably contain multiple independently evolving lineages. Because of their difficult nature, many botanists avoid collecting these plants and so many species are under-represented in the botanical record.

One of the best known species is the Chinese water chestnut, Eleocharis dulcis. These plants bear tubers on their rhizomes which may be peeled and eaten raw or boiled. In Australia, magpie geese rely almost exclusively on these tubers for sustenance for a significant portion of the year.

Selected species[edit]

References[edit]

  1. ^ "Genus: Eleocharis R. Br.". Germplasm Resources Information Network. United States Department of Agriculture. 2010-03-03. Retrieved 2013-05-03. 
  2. ^ a b Kew World Checklist of Selected Plant Families
  3. ^ Smith, S. Galen; Jeremy J. Bruhl, M. Socorro González-Elizondo & Francis J. Menapace. "ELEOCHARIS R. Brown, Prodr. 224. 1810.". Flora of North America. eFloras.org. Retrieved 2013-05-03. 
  4. ^ Govaerts, R. & Simpson, D.A. (2007). World Checklist of Cyperaceae. Sedges: 1-765. The Board of Trustees of the Royal Botanic Gardens, Kew.
  5. ^ Flora of North America, Vol. 23 Page 4, 6, 7, 29, 60, Eleocharis R. Brown, Prodr. 224. 1810.
  6. ^ Flora of China, Vol. 23 Page 188, 荸荠属 bi qi shu, Eleocharis R. Brown, Prodr. 224. 1810.
  7. ^ Altervista Flora Italiana, genere Eleocharis includes photos plus distribution maps for Europe and sometimes for North America
  8. ^ Biota of North America Program, 2013 county distribution maps for US and Canadian species
  9. ^ "Eleocharis". Integrated Taxonomic Information System. Retrieved 2013-05-03. 
  10. ^ "GRIN Species Records of Eleocharis". Germplasm Resources Information Network. United States Department of Agriculture. Retrieved 2013-05-03. 
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