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This species is accepted, and its native range is Dry Tropical Africa to Namibia.
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
Tufted perennial with the base of the stems swollen and densely covered by old leaf-sheaths, the oldest fibrous and thread-like
Morphology Stem
Stems 5–25 cm long and 0.4–0.7 mm thick, triangular, ridged, glabrous
Morphology Leaves
Leaves 5–10 cm long and 0.5–2 mm broad, flat, canaliculate or inrolled, with short prickles on margin and midrib
Morphology Reproductive morphology Inflorescences
Inflorescence an irregular head, but often triangular in outline, 5–8 x 5–9 mm, consisting of several (often 3) greyish white spikes; central spike ovate to cylindrical, 3.5–4 mm wide
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets 1.5–2 mm long, very asymmetric, 1-flowered
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes 1–1.8 mm long, whitish or pale yellow with or without golden brownish midrib, with 1–2 nerves on each side of the slightly or not winged but strongly ciliate midrib; apex with midrib slightly excurrent or midrib ending in apex
Morphology Reproductive morphology Flowers Gynoecium Style
Style with 2 branches
Morphology Reproductive morphology Fruits
Nutlet c. 1 mm long, elliptic.
Distribution
S1 tropical Africa.
Ecology
Altitude range 190–300 m.

[FWTA]

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

Diagnostic
Similar to K. tenuifolia in habit but distinguished by the clearly ciliate keel to the glume and the broader achene
Ecology
Sandy ground in savanna, etc.

[FTEA]

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

Type
Type: Mozambique, Tete, Peters s.n. (B, holo.)
Morphology Culms
Culms tufted, 5–20 cm long, 0.4–0.8 mm wide
Morphology Leaves
Leaf blade 0.9–2 mm wide Leaf sheath brown, 1–3 cm long.
Morphology Reproductive morphology Inflorescences
Inflorescence 5–8 mm long, 5–9 mm wide.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets asymmetrically ovoid and flattened, 1.5–2 mm long, 0.7–0.9 mm wide.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes translucent whitish or pale yellow, 1–1.8 mm long, keel ciliate, with 1–2 veins on either side, apex slightly excurrent
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens ?2–3.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 1–1.2 mm long
Morphology Reproductive morphology Flowers Gynoecium Style
Style 0.4–0.5 mm long
Morphology Reproductive morphology Fruits
Nutlet 1–1.2 mm long, 0.6 mm wide, minutely papillose.
Ecology
" Acacia scrub or grassland, usually along drainage lines or in seasonally wet sites; 0–1400 m
Conservation
Least concern (LC)
Distribution
Flora districts: U1 K1 K2 K4 K7 T3 T6 Range: Mauritania, Senegal, Ivory Coast, Burkino Faso, Nigeria, Chad, Cameroon, Ethiopia, Somalia, Angola, Zimbabwe, Namibia

Native to:

Angola, Burkina, Cameroon, Chad, Eritrea, Ethiopia, Ivory Coast, Kenya, Mali, Mauritania, Mozambique, Namibia, Niger, Nigeria, Senegal, Somalia, Sudan, Uganda, Zambia

Cyperus welwitschii (Ridl.) Lye appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Schimper [2201], Ethiopia Kyllinga triceps var. ciliata K000416282

First published in R.W.Haines & K.A.Lye, Sedges & Rushes E. Afr., App. 3: 2 (1983)

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 welwitschii.]
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Kyllinga welwitschii.]

Literature

Kew Backbone Distributions

  • Barry, J. P. & Celles, J.S. (1991). Flore de Mauritanie 2: 360-550. Centre Regional de Documentation Pedagogique, Nice.
  • Boudet, G., Lebrun, J.P. & Demange, R. (1986). Catalogue des plantes vasculaires du Mali: 1-465. Etudes d'Elevage et de Médecine Vétérinaire des Pays Tropicaux.
  • 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.

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

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