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This species is accepted, and its native range is Eritrea to S. Tropical Africa.
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, Wadi Schoata, Schimper 1375 (B, holo.; not found )
Morphology General Habit
Perennial, tufted, with a short rhizome and swollen stem base, often surrounded by fibres from desintegrated leaf bases.
Morphology Stem
Stem base aromatic (smelling of eucalyptus, or ginger).
Morphology Culms
Culms tufted, 7–46 cm long, 0.8–1.5 mm wide, trigonous, glabrous
Morphology Leaves
Leaf blade linear, flat or grooved, 7–35 cm long, 1–2.5 mm wide, scabrid near apex Leaf sheath pale brown, more reddish near base, 1–6 cm long, the lowermost sometimes leafless, 1–6 cm long. Leaves up to 35 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, spreading or recurved, 1–3(–4), lowermost 3–11 cm long
Morphology Reproductive morphology Inflorescences
Inflorescence capitate, a single yellowgreen turning dark brown to black conical to cylindric spike 5–10(–12) × 5–8 mm (rarely with a small subsidiary spike).
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets many, 2.2–3.5 mm long, 0.9–1 mm wide, 2–3-flowered.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes with yellow margins, green keel, blackish tips, ovate, 1.8–3.2 mm long, acuminate to awned, with very distinct veins
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 1.2–2.5 mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 1.2 mm long
Morphology Reproductive morphology Fruits
Nutlet violet-black, 1–1.2 mm long, 0.6 mm wide, minutely papillose.
Ecology
Shallow soil over rock, seepage zones, seasonally swampy grassland, especially on black cotton soil; 750–2150(–2950) m
Conservation
Least concern (LC)
Distribution
Flora districts: U3 K3 K4 K6 T1 T2 T5 T6 T7 Range: Eritrea, Ethiopia, Somalia

[FTEA]
Use
Roots eaten by herd boys.

Native to:

Eritrea, Ethiopia, Kenya, Malawi, Rwanda, Somalia, Tanzania, Uganda, Zambia, Zaïre

Cyperus costatus Mattf. & Kük. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 1887 Schimper, W. [263], Ethiopia Kyllinga nervosa K000416277
Schimper [1375], Ethiopia Kyllinga nervosa K000416275
Schimper [1375], Ethiopia Kyllinga nervosa K000416274 isotype
Keller [81], Somalia Kyllinga nervosa K000416276

First published in H.G.A.Engler (ed.), Pflanzenr., IV, 20(101): 575 (1936)

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 Kyllinga nervosa.]
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Kyllinga nervosa.]
  • Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae Flora of Tropical East Africa: 1-466. [Cited as Kyllinga nervosa.]

Literature

Kew Backbone Distributions

  • Browning, J. & al. (2020). Flora Zambesiaca 14: 1-455. Royal Botanic Gardens, Kew.

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