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This species is accepted, and its native range is Chad to S. Tropical Africa, Tropical & Subtropical America.
Eleocharis nigrescens (Nees) Steud.

[FTEA]

Cyperaceae, K Hoenselaar, B. Verdcourt & H. Beentje. Hypolytrum, D Simpson. Fuirena, M Muasya. Flora of Tropical East Africa. 2010

Type
Type: Brazil, ‘in maritimis’, Salzmann s.n. (CGE, holo.; K!, iso.)
Morphology General Habit
Tufted annual with crowded stems 3–11 cm tall, filiform, obscurely 3–4-angular and often rather flattened, 0.2–0.7 mm thick, often with branching base due to short branched vertical stolons or elongate internodes.
Morphology Leaves Leaf sheaths
Sheaths reddish to purple near base, greyish above, the upper ending in an acute to attenuate lobe 1–2 mm long.
Morphology Roots
Roots slender
Morphology Reproductive morphology Inflorescences Spikelets
Spikelet ovoid, 2–5 × 1–2.5 mm.
Morphology Reproductive morphology Inflorescences
Inflorescence bracts fertile, similar to glumes but slightly larger.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dark purple-brown with broad paler margin and paler midrib, 0.8–1.3 × 0.4–1 mm, obtuse at apex.
Morphology Reproductive morphology Flowers Perianth
Perianth absent
Morphology Reproductive morphology Flowers Androecium Stamens
Stamen 1
Morphology Reproductive morphology Flowers Gynoecium Style
Style 3branched
Morphology Reproductive morphology Fruits
Nutlet pale brownish yellow, semi-translucent, obovoid-triangular, 0.4–0.6 × 0.2–0.4 mm, 3-ribbed to almost winged when dry, smooth; appendage flattened, darker than nutlet.
Ecology
Damp depressions, old rice paddies, pool edges, near waterfalls; 0–1700 m
Note
Close to E. atropurpurea but distinct in the absence of perianth bristles and the triangular (not flattened) nutlet. Greenway & Kanuri 15004 from K 6, Nasampolai Valley, has no perianth, sterile staminodes, and slightly flattened 3-angled nutlets; I am not sure what this is! The combination of the name nigrescens in Eleocharis is sometimes ascribed to Steudel but Kunth gave both the new combination and cited the old name plus its protologue.
Distribution
Flora districts: U4 K4 T4 T6 T7 T8 Z Range: Senegal, Mali, Burkina Faso, Ivory Coast to Nigeria, Sudan, Zambia, Malawi, Zimbabwe; Madagascar, tropical Americas

[CPLC]

Bernal, R., Gradstein, S.R. & Celis, M. (eds.). 2015. Catálogo de plantas y líquenes de Colombia. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá. http://catalogoplantasdecolombia.unal.edu.co

Distribution
Colombia

Native to:

Bolivia, Brazil North, Brazil Northeast, Central African Repu, Chad, Colombia, Costa Rica, Cuba, Dominican Republic, Florida, Jamaica, Kenya, Malawi, Mexico Gulf, Mexico Southwest, Panamá, Paraguay, South Carolina, Sudan, Tanzania, Trinidad-Tobago, Uganda, Venezuela, Zambia, Zimbabwe

Eleocharis nigrescens (Nees) Kunth appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2003 Salzmann, P. [s.n.], Bahia K000189277 isotype
Dec 1, 1986 Noblick, L.R. [2094], Bahia K000189274
Sep 1, 1986 Gardner, G. [2374], Piauí K000189275
Jun 1, 1937 Hildebrandt, J.M. [1063], Tanzania K000416637 Unknown type material
Aug 1, 1888 Salzmann, P. [s.n.], Bahia K000189278
Schweinfurth, G. [2576], Sudan K000416633 Unknown type material
Tanzania K000416636
Bidgood, S. [5973], Tanzania K000468452
Guedes, M.L. [2919], Bahia K000189279
Salzmann, P. [s.n.], Bahia K000189276 isotype
Bidgood, S. [6082], Tanzania K000468343

First published in Enum. Pl. 2: 157 (1837)

Accepted by

  • Acevedo-Rodríguez, P. & Strong, M.T. (2012). Catalogue of seed plants of the West Indies Smithsonian Contributions to Botany 98: 1-1192.
  • Browning, J. & al. (2020). Flora Zambesiaca 14: 1-455. Royal Botanic Gardens, Kew.
  • Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew.
  • Espejo Serna, A. & López-Ferrari, A.R. (1997). Las Monocotiledóneas Mexicanas una Sinopsis Florística 5: 1-98. Consejo Nacional de la Flora de México, México D.F.
  • Govaerts, R. & Simpson, D.A. (2007). World Checklist of Cyperaceae. Sedges: 1-765. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Govaerts, R. (2004). World Checklist of Monocotyledons Database in ACCESS: 1-54382. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Hammel, B.E. & al. (2003). Manual de Plantas de Costa Rica 2: 1-694. Missouri Botanical Garden Press, St. Louis.
  • Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae Flora of Tropical East Africa: 1-466.
  • Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
  • Jørgensen, P.M., Nee, M.H. & Beck., S.G. (eds.) (2013). Catálogo de las plantas vasculares de Bolivia Monographs in Systematic Botany from the Missouri Botanical Garden 127: 1-1741. Missouri Botanical Garden.
  • Nelson Sutherland, C.H. (2008). Catálogo de las plantes vasculares de Honduras. Espermatofitas: 1-1576. SERNA/Guaymuras, Tegucigalpa, Honduras.

Literature

Catálogo de Plantas y Líquenes de Colombia

  • ColPlantA (2021). "ColPlantA. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://www.colplanta.org/"

Kew Backbone Distributions

  • Acevedo-Rodríguez, P. & Strong, M.T. (2012). Catalogue of seed plants of the West Indies Smithsonian Contributions to Botany 98: 1-1192.
  • Boulvert, Y. (1977). Catalogue de la Flore de Centrafrique 2(2): 1-94. ORSTOM, Bangui.
  • Espejo Serna, A. & López-Ferrari, A.R. (1997). Las Monocotiledóneas Mexicanas una Sinopsis Florística 5: 1-98. Consejo Nacional de la Flora de México, México D.F.
  • Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae Flora of Tropical East Africa: 1-466.

Flora of Tropical East Africa

  • Enum. Pl. 2: 157 (1805)
  • K.B. 43: 423 (1988).
  • Rhodora 39: 239, t. 462 (1937)
  • Sedges & Rushes E. Afr.: 72, fig. 106, 107 (1983)
  • Syn. Pl. Glum. 2: 77 (1855)

Catálogo de Plantas y Líquenes de Colombia
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Plants and People Africa
Common Names from Plants and People Africa http://www.plantsandpeopleafrica.com/
© Plants and People Africa http://www.plantsandpeopleafrica.com http://creativecommons.org/licenses/by/3.0/