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This species is accepted, and its native range is South Sudan 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: Malawi, Mt Malosa, Whyte s.n. (K!, syn.) & Mt Zomba, Whyte s.n. (K!, syn.)
Morphology General Habit
Perennial, robust, up to 210 cm tall, with thick woody rhizome, up to 1.2 cm in diameter.
Morphology Culms
Culms 85–200 cm long, 4–7 mm wide, trigonous to triquetrous, smooth to somewhat scabrid
Morphology Leaves
Leaves many, crowded, up to 215 cm long. Leaf blade linear, flat, 64–200 cm long, 1.4–3.7 cm wide, with several prominent veins, scabrid on veins and margins, apex acute Leaf sheath reddishbrown, 4–14 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, spreading to sometimes erect, 3–many, lowermost 34–100 cm long, 1.1–2.9 cm wide
Morphology Reproductive morphology Inflorescences
Inflorescence compound, primary branches 6–many, 3–20 cm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets in digitate clusters, sessial and at the end of primary, secondary and tertiary branches, 3–7 per cluster, lanceolate-ovoid, 3.2–6.7 mm long, 0.8–2.2 mm wide, rachilla straight.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes reddish-brown, sometimes reddish-green, ovate, 1.8–2.7 mm long, 1.2–1.8 mm wide, keel green, excurrent, apex mucronate
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 1.3–1.9(–3.1) mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 0.6–1.1 mm long
Morphology Reproductive morphology Fruits
Nutlet reddish-brown, ellipsoid (obovoid), 0.9–1.3 mm long, 0.4–0.63 mm wide, almost smooth to minutely papillose.
Ecology
In thickets and open and degraded upland forests, sometimes along river-banks; 950–2600 m
Conservation
Least Concern (LC) due to its distribution and common habitat.
Note
This species is related to C. derreilema but differs in the mucronate (not rounded) apex to the glume.
Distribution
Range: Congo-Kinshasa, Burundi, Rwanda, Malawi Flora districts: U2 U 3/ U4 K3 K4 K5 T2 T3 T5 T6 T7 T8

Native to:

Burundi, Kenya, Malawi, Mozambique, Rwanda, Sudan, Tanzania, Uganda, Zambia, Zaïre

Cyperus ajax C.B.Clarke appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Oct 5, 1898 Whyte [s.n.], Malawi K000362648 Unknown type material
Oct 5, 1898 Whyte, A. [s.n.], Malawi K000362649 Unknown type material

First published in D.Oliver & auct. suc. (eds.), Fl. Trop. Afr. 8: 343 (1901)

Accepted by

  • 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.
  • 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.

Literature

Kew Backbone Distributions

  • 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 Tropical East Africa

  • E.P. 4, 20 (101): 198 (1936)
  • F.T.A. 8: 343 (1902)
  • Haines & Lye, Sedges & Rushes E. Afr.: 155, fig. 284 (1983).

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