Eleocharis
Eleocharis | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Monocots |
Clade: | Commelinids |
Order: | Poales |
Family: | Cyperaceae |
Genus: | Eleocharis R.Br.[1] |
Synonyms[2] | |
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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 or spikesedges. 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, it is suggested that many botanists avoid collecting these plants and so many species are under-represented in the botanical record.[9]
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[]
- Eleocharis acicularis (L.) Roem. & Schult. – needle spikerush; dwarf hairgrass
- Eleocharis acuta R.Br.
- (Roxb.) Schult.
- Steud.
- Eleocharis atropurpurea (Retz.) J.Presl & C.Presl – purple spikerush
- (Torr.) Chapm.
- (Piper) Svenson – beautiful spikerush
- Eleocharis bifida S.G. Smith glade spikerush
- Eleocharis bolanderi A.Gray – Bolander's spikerush
- Eleocharis brassii S.T.Blake
- Svenson ex Small
- Eleocharis caespitosissima Baker
- Torr. – coastal spikerush, Gulf Coast spikerush
- Sull. – flatstem spikerush
- Eleocharis confervoides (Poir.) Steud.
- D.Don
- Eleocharis cylindrostachys Boeckler
- Eleocharis dietrichiana Boeckler
- Eleocharis dulcis (Burm.f.) Trin. ex Hensch. – Chinese water chestnut
- (Kunth) Roem. & Schult.
- Eleocharis equisetoides (Elliott) Torr.
- Steud. – Red-stemmed spikerush
- Kunth
- Eleocharis geniculata (L.) Roem. & Schult. – Canada spikesedge
- Eleocharis gracilis R.Br.
- Eleocharis halophila Fernald & Brackett – saltmarsh spikerush
- Eleocharis jacobsiana K.L.Wilson
- Eleocharis keigheryi K.L.Wilson
- Ohwi
- Eleocharis macrostachya Britton – pale spikerush
- (Kunth) Roem. & Schult.
- Eleocharis montevidensis Kunth – sand spikerush
- (L.) Roem. & Schult. – scallion grass
- Eleocharis nitida Fernald – neat spikerush
- Schult.
- Eleocharis obtusa (Willd.) Schult. – blunt spikerush
- Eleocharis ochrostachys Steud.
- Eleocharis pachycarpa Desv. – black sand spikerush
- (C.Wright) C.B.Clarke – false junco
- Eleocharis pallens S.T.Blake – pale spikerush
- Eleocharis palustris (L.) Roem. & Schult. – common spikerush
- Eleocharis papillosa Latz
- Eleocharis parishii Britton – Parish's spikerush
- Eleocharis parvula (Roem. & Schult.) Link ex Bluff et al. – dwarf spikerush, hairgrass
- J.Presl & C.Presl
- Eleocharis philippinensis Svenson
- Eleocharis plana S.T.Blake
- Eleocharis pusilla R.Br.
- Eleocharis quadrangulata (Michx.) Roem. – squarestem spikerush
- Eleocharis quinqueflora (Hartmann) O.Schwarz – fewflower spikerush
- Eleocharis radicans (A.Dietr.) Kunth – rooted spikerush
- Eleocharis rivalis K.L.Wilson
- Eleocharis rostellata (Torr.) Torr. – beaked spikerush
- Eleocharis sanguinolenta K.L.Wilson
- Kunth
- Eleocharis sphacelata R.Br. – tall spikerush
- Eleocharis spiralis (Rottb.) Schult.
- Eleocharis sundaica J.Kern
- (Willd.) Schult. – slender spikerush
- Eleocharis torticulmis S.G.Sm. – twist-stem spikerush
- (Link) Schult. – twisted spikerush
- Eleocharis triquetra K.L.Wilson
- Eleocharis tuberculosa (Michx.) Roem. & Schult.
- Eleocharis uniglumis (Link) (Link) Schult., 1824
- Eleocharis vivipara Link – umbrella hairgrass[10][11]
References[]
- ^ "Genus: Eleocharis R. Br". Germplasm Resources Information Network. United States Department of Agriculture. 2010-03-03. Archived from the original on 2013-12-03. Retrieved 2013-05-03.
- ^ a b Kew World Checklist of Selected Plant Families
- ^ Smith, S. Galen; Bruhl, Jeremy J.; González-Elizondo, M. Socorro; Menapace, Francis J. "ELEOCHARIS R. Brown, Prodr. 224. 1810". Flora of North America. eFloras.org. Retrieved 2013-05-03.
- ^ Govaerts, R. & Simpson, D.A. (2007). World Checklist of Cyperaceae. Sedges: 1-765. The Board of Trustees of the Royal Botanic Gardens, Kew.
- ^ Flora of North America, Vol. 23 Page 4, 6, 7, 29, 60, Eleocharis R. Brown, Prodr. 224. 1810.
- ^ Flora of China, Vol. 23 Page 188, 荸荠属 bi qi shu, Eleocharis R. Brown, Prodr. 224. 1810.
- ^ Altervista Flora Italiana, genere Eleocharis includes photos plus distribution maps for Europe and sometimes for North America
- ^ Biota of North America Program, 2013 county distribution maps for US and Canadian species
- ^ McKinney; et al. (2011). "Review of progress and goals in systematic taxonomy of vascular aquatic species". Systematic Botany. 34 (7): 87–112.
- ^ "Eleocharis". Integrated Taxonomic Information System. Retrieved 2013-05-03.
- ^ "GRIN Species Records of Eleocharis". Germplasm Resources Information Network. United States Department of Agriculture. Archived from the original on 2013-06-26. Retrieved 2013-05-03.
External links[]
Wikimedia Commons has media related to Eleocharis. |
Wikispecies has information related to Eleocharis. |
- USDA Plants Profile: North American Species
- eFloras Profile
- Baksh & Richards (2006) An architectural model for Eleocharis: morphology and development of Eleocharis cellulosa (Cyperaceae). Am J Botany 93:707-15.
- Hairgrass Archived 2014-02-22 at the Wayback Machine
- Botany.com
- Rataj, Karel. 1977. Aquarium plants; hair grass. TFH 12/77.
- Eleocharis
- Cyperaceae genera
- Aquatic plants
- Freshwater plants