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This species is accepted, and its native range is E. Ethiopia to N. Tanzania.
A specimen from Kew's Herbarium

[FSOM]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Robust tussocky perennial with a short horizontal rhizome covered by the fibrous remains of old basal leaf-sheaths; stolons absent
Morphology Stem
Stems 20–40 cm long and 1.5–2 mm thick, triangular, glabrous, the base slightly swollen and covered by numerous leaf-sheaths
Morphology Leaves
Leaves 10–20 cm long and 3–8 mm wide, strongly scabrid at least on margin and midrib
Morphology Reproductive morphology Inflorescences
Inflorescence a single white globose head 17–20 mm in diam.; involucral bracts 3–4, similar to the leaves, reflexed or spreading
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets 5–8 x c. 2 mm, ovate, 2–5-flowered; 2 basal glumes and flowers separated on a c. 0.8 mm long spikelet-axis
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes 4.5–7 mm long, whitish, but with a light brownish tinge at least when dry, and with c. 5 nerves on each side of the scabrid unwinged midrib
Morphology Reproductive morphology Flowers Gynoecium Style
Style with 2 branches
Morphology Reproductive morphology Fruits
Nutlet 2–2.2 x c. 1.2 mm, obovate-flattened, dark reddish brown to blackish, minutely papillose.
Distribution
S1–3; Ethiopia, Kenya
Ecology
Sea-level to c. 550 m.

[FTEA]

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

Type
Type: Ethiopia, Harradigit, James & Thrupp s.n. (K, holo.; K, iso., both out on loan)
Morphology General Habit
Perennial, robust, up to 42 cm tall, with a short horizontal rhizome covered by the fibrous remains of old basal leaf sheaths.
Morphology Culms
Culms tussocky, 30–40 cm long, 1.5–2 mm wide, trigonous, glabrous, the base slightly swollen
Morphology Leaves
Leaves up to 20 cm long. Leaf blade linear, 10–20 cm long, 3–8 mm wide, scabrid at least on margin and primary vein Leaf sheath pale red-brown, 4–9 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, reflexed or spreading, 3–4, lowermost 10–17 cm long, 3.5–7 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence capitate, a single white globose head 13–20 mm in diameter.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets many per cluster, ovoid, 5–8 × 2 mm, 3–5-flowered but sometimes only the 2 lower flowers perfecting into nutlets; basal two glumes and flowers separated on a ± 0.8 mm long spikelet axis.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes whitish with a pale brownish tinge, 4.5–7 mm long, keel smooth or scabrid, unwinged, with ± 5 veins on either side, apex attenuate
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3
Morphology Reproductive morphology Fruits
Nutlet pale redbrown, ovoid, trigonous, 1.9 × 0.9 mm, minutely papillose
Figures
Fig. 47: 8-10, p314
Ecology
Grassland or thinly wooded grassland, abandoned cultivations; (90–)1050–1350(–2350) m
Conservation
Least concern (LC)
Note
Distinct from the rather similar comosipes by the wider leaves and larger inflorescence; but the key in Haines & Lye does not work, as it says ‘glumes 2.5–3 mm– comosipes, glumes 3.5–5 mm– eximius’ while the text gives the glume length as 3–4 mm for comosipes.. Other differences reported are: Culms 0.7–1.5 mm thick; leaf 1–4 mm wide; head of 2–3 rounded spikes; largest involucral bracts 2–8 mm; spikelets 3–4 × 1–3 mm; This obviously needs a decision involving the types, which I was unable to study. Culm 1.5–2 mm thick; leaf 3–8 mm wide; head single, globose; largest involucral bracts 10–17 cm; spikelets 5–8 × 2 mm; grassland . . . . eximia
Distribution
Range: Ethiopia, Somalia Flora districts: K4 K7 T1 T2

Native to:

Ethiopia, Kenya, Somalia, Tanzania

Cyperus eximius (C.B.Clarke) Mattf. & Kük. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
James [s.n.], Ethiopia Kyllinga eximia K000416285 Unknown type material

First published in H.G.A.Engler (ed.), Pflanzenr., IV, 20(101): 567 (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 eximia.]
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Kyllinga eximia.]
  • Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae Flora of Tropical East Africa: 1-466. [Cited as Kyllinga eximia.]

Literature

Kew Backbone Distributions

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

Flora of Somalia

  • Flora Somalia, Vol 4, (1995) Author: by K. A. Lye [updated by M. Thulin 2008]

Flora of Somalia
Flora of Somalia
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