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This species is accepted, and its native range is Eritrea to NE. Tanzania.
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: Kenya, Machakos District: near Kibwezi, Kaessner 716 (K!, M!, iso.)
Morphology General Habit
Annual, growing in tussocks, up to 14 cm tall.
Morphology Culms
Culms tufted, 3.5–12.5 cm long, 0.5–0.7 mm wide, trigonous, smooth
Morphology Leaves
Leaf sheath rusty reddish-brown, 1–3 cm long, with many veins. Leaves up to 9 cm long. Leaf blade linear, folded when dried, 2–6 cm long, 1.3–3 mm wide, minutely scabrid along the margin apex acute
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, spreading, 1–3, lowermost 0.7–2.5 cm long, 0.9–2.5 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence capitate.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets 4–20 per head, compressed squarrose, 6.5–12 mm long, 3.3–5.6 mm wide, rachis straight.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes rusty reddish-brown, ovate to 3angled, 2.1–2.7 mm long, 1.4–1.9 mm wide, with lateral veins on either side, keel pale brown, apex mucronate, recurved
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 1.4–2.4 mm long
Morphology Reproductive morphology Fruits
Nutlet grey to brownish-grey, ovoid, trigonous, 0.6–0.9 mm long, 0.5–0.6 m wide, almost smooth to minutely papillose.
Ecology
In seasonally damp habitats, on limestone rocks, and in bushland; sea-level to 900 m
Conservation
Least concern (LC)
Note
Clarke thought this was close to C. teneriffae but with the spikelets much narrower, and a different nutlet. It is possibly the same as rubicundus, but slightly smaller in general size, glume size and nutlet size. This species is accepted with some hesitation, and it might only be a variety of rubicundus.
Distribution
Range: Eritrea, Ethiopia Flora districts: K4 K7 T3

Native to:

Eritrea, Ethiopia, Kenya, Tanzania

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

Date Reference Identified As Barcode Type Status
Kaessner [716], Kenya K000321440 Unknown type material

First published in Bot. Jahrb. Syst. 38: 133 (1906)

Accepted by

  • Edwards, S., Demissew, S., & Hedberg, I. (eds.) (1997). Flora of Ethiopia and Eritrea 6: i-xxviii, 1-586. The National Herbarium, Addis Ababa University, Ethiopia & The Department of Systematic Botany, Upps.
  • 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

Flora of Tropical East Africa

  • E.J. 38: 133 (1906)
  • E.P. 4, 20 (101): 306 (1936)
  • Fl. Eth. 6: 465 (1997).

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