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This species is accepted, and its native range is Tropical Africa.

[FWTA]

Cyperaceae, Miss S. S. Hooper. Flora of West Tropical Africa 3:2. 1972

Diagnostic
Distinguished from the other dark brown or black spikeletted species by the broader flat leaves and long linear spikelets
Ecology
Swampy ground up to 5,800 ft.

[FTEA]

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

Type
Type: Sudan, Bahr el Ghazal, terr. Nuer, Schweinfurth 1172 (B, holo.)
Morphology General Habit
Perennial up to 60 cm high, slender or robust, with or without stolons, with many roots.
Morphology Culms
Culms tufted, 23–54 cm long, 1.6–2.4 mm wide, trigonous, smooth, the basal part covered with loose leaf sheaths
Morphology Leaves
Leaves up to 37 cm long. Leaf sheath brown, 3–9 cm long. Leaf blade linear, plicate, stiff, 17–31 cm long, 3.4–4.7 mm wide, acute to acuminate, apex scabrid
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, 3–5, 11.3–17 cm long, 3–5.2 mm wide, apex scabrid
Morphology Reproductive morphology Inflorescences
Inflorescence simple to compound, primary branches 2–8, 0.5–7 cm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets loosely to densely arranged in digitate clusters, sometimes on an elongated axis, the clusters sessile and at the end of primary branches. Spikelets many per cluster, narrowly linear-lanceolate, 5.7–11.5 mm long, 1.1–1.5 mm wide, axis straight to curved.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes linear-lanceolate, glabrous, red-brown, 1.5–2.1 mm long, 0.8–1 mm wide, keel rounded, sometimes ± acute, (yellowish) green, grooved, 2-veined, apex obtuse to sometimes almost acute
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2: filaments 1.8–2 mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 0.4–0.5 mm long
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma 2-branched
Morphology Reproductive morphology Fruits
Nutlet brown to grey, often shiny, oblong-cylindrical, 1–1.2 mm long, 0.3–0.4 mm wide, minute tubercles in longitudinal rows
Ecology
Swamps, ditches and moist grassland; 1500–1800 m
Conservation
Least concern (LC); although not widespread in the Flora area, the species is fairly widely distributed, and occurs in a common habitat.
Note
This species is quite similar to P. aethiops, but differs in the colour of the glumes, brown to red-brown in P. nuerensis and brown-black in P. aethiops. The glumes also vary in size, those of P. nuerensis are larger than those of P. aethiops. The leaves and involucral bracts are also wider in P. nuerensis, and P. nuerensis has two stamens, while P. aethiops has 3.
Distribution
Range: Sierra Leone, Nigeria, Cameroon, Central African Republic, Rwanda, Sudan Flora districts: U1 K3 T4 T5 T7

Native to:

Benin, Cameroon, Central African Repu, Guinea, Ivory Coast, Kenya, Malawi, Nigeria, Rwanda, Sierra Leone, Sudan, Tanzania, Uganda, Zambia, Zaïre, Zimbabwe

Cyperus nuerensis Boeckeler appears in other Kew resources:

First published in Flora 62: 555 (1879)

Not accepted by

  • Govaerts, R. & Simpson, D.A. (2007). World Checklist of Cyperaceae. Sedges: 1-765. The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Pycreus nuerensis.]
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Pycreus nuerensis.]

Literature

Kew Backbone Distributions

  • Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers.
  • Browning, J. & al. (2020). Flora Zambesiaca 14: 1-455. Royal Botanic Gardens, Kew.
  • Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae Flora of Tropical East Africa: 1-466.

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

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