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This species is accepted, and its native range is NE. & E. 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, Djebel Gerara, Rohlfs & Stecker 47 (B, holo.)
Morphology General Habit
Perennial, robust, up to 80(–120) cm tall, with a short rhizome or stoloniferous.
Morphology Culms
Culms solitary or several together from thick stolons, 24–72 cm long, 1.7–2.5 mm wide, trigonous, with longitudinal ridges, glabrous, the base swollen to subsucculent
Morphology Leaves
Leaves up to 80 cm long. Leaf blade linear, flat, 30–60 cm long, 3–5.5 mm wide, scabrid along the margin, apex acuminate Leaf sheath whitish-grey to pale brown, pinkish at base, papery, thin, 9–19 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, spreading, 3–7, lowermost 21–72 cm long, 2.5–5.2 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence a simple anthela, primary branches 4–10, 0.5–8 cm long. Spikes 28–80 mm long, 4–6 mm wide, sessile and at the end of primary branches
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets many per spike, linear-lanceolate, 2.3–3.5 mm long, 0.7–1 mm wide, rachis straight, few glumes per spikelet.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes yellowishbrown to reddish brown, boatshaped, 2.2–3 mm long, 1–1.2 mm wide, keel green, with several veins on either side, apex acuminate to almost mucronate
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 2.3–3.5 mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 1.6–1.8 mm long
Morphology Reproductive morphology Fruits
Nutlet dark reddish-brown, oblong-ellipsoid, trigonous, 1.6–1.9 mm long, 0.6–0.9 mm wide, minutely papillose in longitudinal rows.
Ecology
On rocky outcrops, thin soil over rock or lava, also in grassland or scattered tree grassland, rare on the coast; 0–1950 m
Conservation
Least Concern (LC)
Note
This looks like C. oblongoincrassatus but differs in the very narrow spikes, short spikelets and small glumes. " C. oblongoincrassatus var. clarior is brought into synonymy here. The Tanzanian syntype of this taxon has an unknown locality, though in the Rift Valley; I presume this would have been in T 2.
Distribution
Flora districts: U1 K1 K2 K3 K4 K6 K7T2 T3 T6 T7 Range: Eritrea, Ethiopia, Somalia

Native to:

Eritrea, Ethiopia, Kenya, Somalia, Tanzania, Uganda

Cyperus rohlfsii Boeckeler appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Kassner, T. [762], Kenya K000321477 syntype

First published in Flora 65: 13 (1882)

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

Kew Backbone Distributions

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

Flora of Tropical East Africa

  • Fl. Eth. 6: 458 (1997).
  • Flora 65: 13 (1882)
  • Haines & Lye, Sedges & Rushes E. Afr.: 214, fig. 431 (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