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This species is accepted, and its native range is Bioko to Ethiopia and Malawi.
A specimen from Kew's Herbarium

[FTEA]

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

Type
Type: Ethiopia, Debra Eski, Schimper s.n. (P, syn.) & 233 (P, syn.)
Morphology General Habit
Perennial, fairly robust, up to 100 cm tall, with a short 3–6 mm thick creeping rhizome and many crowded roots, occasionally with more slender curving scalecovered stolons.
Morphology Culms
Culms few, 26–82 cm long, 1.9–7 mm wide, trigonous, sometimes almost triquetrous, glabrous
Morphology Leaves
Leaf sheath green to reddishbrown, 4–20 cm long. Leaf blade linear, flat, 20–40 cm long, 5–12 mm wide, scabrid on margins and major veins, apex acute Leaves up to 60 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, spreading, 4–7, lowermost 21–36 cm long, 4–11.5 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence a compound anthela, primary branches 4–10, 1.5–12 cm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets in crowded spikes, giving the inflorescence a brush-like appearance, sessile and at the end of primary and secondary branches, to 82 spikelets per spike, linear-lanceolate, 8–15 mm long, 2–3 mm wide, rachilla straight.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dark reddish-brown, sometimes almost black, lanceolate, 3.2–3.5 mm long, 1.4–1.6 mm wide, keel usually green, apex acuminate to slightly mucronate
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 2.7–3.7 mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 0.5–0.6 mm long
Morphology Reproductive morphology Fruits
Nutlet brown, ellipsoid-lanceoloid, trigonous, 2–2.4 mm long, 0.6–0.8 mm wide, almost smooth.
Ecology
In wet grasslands, swamps and bogs, alongside water, in damp places in upland montane forest; 1200–3350 m
Conservation
Least Concern due to its wide distribution and common habitat
Distribution
Flora districts: U2 U3 K3 K4 K5T2 T3 T7 T8 Range: Bioko, Congo-Kinshasa, Rwanda, Burundi, Ethiopia, Malawi

[FWTA]

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

Morphology General Habit
Tufted sedge to 1·3 m. high
Morphology Reproductive morphology Inflorescences
Characterized by the secondary rays of the inflorescence (when present) spreading or deflexed and the elongated, subcylindric spikes of black and green slender spikelets
Ecology
Damp places.

Native to:

Burundi, Cameroon, Ethiopia, Gulf of Guinea Is., Kenya, Malawi, Rwanda, Tanzania, Uganda, Zaïre

Cyperus aterrimus Hochst. ex Steud. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2011 Pollard, B.J. [291], Cameroon Cyperus atroviridis K000297673
Jan 1, 2011 Pollard, B.J. [304], Cameroon Cyperus atroviridis K000297675
Sep 1, 2003 Mann, G. [1466] Cyperus atroviridis K000099521 Unknown type material
May 1, 2001 Pollard, B.J. [194], Cameroon Cyperus atroviridis K000050878
May 1, 1998 Cheek, M. [8669], Cameroon Cyperus atroviridis K000297674
May 1, 1998 Cable, S. [3111], Cameroon Cyperus atroviridis K000678221
May 1, 1998 Onana, J.-M. [487], Cameroon Cyperus atroviridis K000678222
Dec 1, 1997 Pollard, B.J. [31], Cameroon Cyperus atroviridis K000297676
Bidgood, S. [5271], Tanzania Cyperus atroviridis K000190500
Bidgood, S. [5327], Tanzania Cyperus atroviridis K000190557
Bidgood, S. [5328], Tanzania Cyperus atroviridis K000190558
Bidgood, S. [6138], Tanzania Cyperus atroviridis K000468287

First published in Syn. Pl. Glumac. 2: 31 (1854)

Accepted by

  • Browning, J. & al. (2020). Flora Zambesiaca 14: 1-455. Royal Botanic Gardens, Kew.
  • 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. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.
  • Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae Flora of Tropical East Africa: 1-466.
  • Velayos, M., Aedo, C., Cabezas, F., de la Estrella, M., Barberá, P. & Fero, M. (eds.) (2014). Flora de Guinea Ecuatorial 11: 1-416. Consejo superior de investigaciones científicas, Real jardín botánico, Madrid.

Literature

Kew Backbone Distributions

  • Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae Flora of Tropical East Africa: 1-466.

Flora of Tropical East Africa

  • E.P. 4, 20 (101): 141 (1936)
  • F.T.A. 8: 358 (1902)
  • Fl. Eth. 6: 454 (1997).
  • Syn. Pl. Glum. 2: 31 (1854)

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

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