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This species is accepted, and its native range is Equatorial Guinea, Ethiopia to 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, border of Lake Tana near Scimbit, Pichi-Sermolli 1986 (FT, holo.; Aluka!)
Morphology General Habit
Perennial with thick woody rhizome.
Morphology Culms
Culms closely set on rhizome, 1–3 m long and 1–2 cm thick, sharply triangular to almost winged, glabrous
Morphology Leaves
Leaves reduced to 5–10 cm long blades produced from dark reddish brown sheaths (not fleshy)
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts green fading to brown, 8–12. Leaf-like, suberect, lowermost 8–20 cm long, 1–2 cm wide, glabrous
Morphology Reproductive morphology Inflorescences
Inflorescence an compound anthela to 40 × 40 cm, primary branches 15–30, 5–35 cm long, triangular to flattened, at the base of the branches with green tubular prophylls 2–4 cm long; primary branches ending in simple umbels of 1–10 spikes, these spikes 2–4 × 1–2 cm, with many spreading spikelets.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets cylindric, 5–9 × 0.7–1.5 mm.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes pale or reddish brown, sometimes with green midrib, ovate, 1.5–2 mm long, obtuse or with excurrent midrib
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3
Morphology Reproductive morphology Flowers Gynoecium Style
Style 3-branched
Morphology Reproductive morphology Fruits
Nutlets rarely developing.
Ecology
Swamps; 1650–1850 m
Conservation
Data deficient due to rather unclear taxonomy.
Note
Haines & Lye state this is intermediate between C. papyrus and latifolius in most characters – and may represent a hybrid.
Distribution
Flora districts: U2 K3 T2 T3 Range: Ethiopia

Native to:

Equatorial Guinea, Ethiopia, Kenya, Tanzania, Uganda

Cyperus penzoanus Pic.Serm. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Picji-Sermolli, R. [1982], Ethiopia Cyperus morandinii K000321340 Unknown type material

First published in Miss. Stud. Lago Tana 7(1): 183 (1951)

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.
  • Velayos, M., Aedo, C., Cabezas, F., de la Estrella, M., Barberá, P. & Fero, M. (eds.) (2014). Flora de Guinea Ecuatorial 11: 1-416. Consejo superior de investigaciones científicas, Real jardín botánico, Madrid.

Literature

Kew Backbone Distributions

  • Cabezas, F., Aedo, C. & Velayos, M. (2004). Checklist of the Cyperaceae of Equatorial Guinea (Annobón, Bioko, Río Muni) Belgian Journal of Botany 137: 3-26.

Flora of Tropical East Africa

  • Fl. Eth. 6: 443 (1997).
  • Haines & Lye, Sedges & Rushes E. Afr.: 177, fig. 338 (1983)
  • Miss. Stud. Lago Tana 7(1): 183 (1951)

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