Skip to main content
This species is accepted, and its native range is Tropical & S. Africa to N. Australia.
Cyperus denudatus L.f.

[FTEA]

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

Type
Type: South Africa, Cape of Good hope, without indication of collector (ubi?)
Morphology General Habit
Perennial, with a 3 cm thick creeping scale-covered rhizome, up to 95 cm tall.
Morphology Culms
Culms tufted, crowded, 19–89 cm long, 0.5–1.6 mm wide, trigonous to slightly triquetrous, smooth
Morphology Leaves
Leaves with leaf sheath reddish-brown to purple, 2–18 cm long. Leaf blade absent or reduced to 1 cm long, then reddish-brown
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaflike, erect to spreading, 2(–3), lowermost 1–4 cm long, 1–2.3 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence a simple to compound anthela, primary branches 5–12, 1.5–6.6(–16) cm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets in digitate clusters, sessile and at the end of primary and secondary branches, 2–5 per cluster, linear-lanceolate, 2.4–8(–20) mm long, 0.9–1.7 mm wide, rachis straight, sometimes slightly curved.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes pale brown to reddish-brown to dark brown, ovate, 1.1–1.7 mm long, 0.6–0.8 mm wide, keel greenish, acute, apex slightly excurrent
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 1.1–1.6 mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 0.6–1 mm long
Morphology Reproductive morphology Fruits
Nutlet whitish when young or depauperate, brown when mature, ovoid to obovoid, 0.5–0.7 mm long, 0.3–0.6 mm wide, base cuneate, muricate when young or depauperate. Tuberculate when mature
Ecology
River-sides, flood plains, swamps, damp grassland, moist rock crevices; 0–2000 m
Conservation
Least Concern (LC) due to its wide distribution and common habitat.
Note
Although C. platycaulis var. recedens has been put into synonymy of C. platycaulis by many others, it has more in common with denudatus: slender appearance, shorter glumes and the same colour as denudatus. Haines & Lye state this species is closely related to C. haspan, but differs in having no leaves. Haines & Lye include C. phaeorhizus here, which I (HB) have under haspan. HB: in the protologue of C. denudatus, the taxon is not compared to any other sedge. ‘Culmo triquetro, involucro subnullo.” Hab. ad Caput Bona Spei. ‘Culmus triqueter, bipedalis, vagina unica in medio culmi; umbella composita, non multum expansa; involucrum universale radiis vix manifesto, ut fere nullis, partiale nullum; spicae oblongae, purpurescantes, carina viridi, apice patentiusculae” (sic). Haines & Lye feel maybe denudatus is a variety of haspan – and I (HB) agree that the two are very similar, apart from the absence/presence of leaves character.
Distribution
Range: Widespread on west, central and southern tropical Africa Flora districts: U2 U4 K3 K4 K7 T1 T2 T3 T4 T5 T6 T7 T8

[FTEA]

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

Type
Types: Tanzania, Lushoto District: Usambara Mts, Kwai, Albers 227 & Eick 112 (B, syn., not found)
Vegetative Multiplication Rhizomes
Horizontal rhizome and dense culms
Morphology Leaves
Leaves 40–50 cm long, 5–6 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence bracts 2–3 Inflorescence of a simple umbel of spikes, or a congested head, with spikelets of 12 × 3 mm, 8–12-flowered.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes blackish
Morphology Reproductive morphology Flowers Gynoecium Style
Style 3branched
Morphology Reproductive morphology Fruits
Nutlet ovoid, trigonous to pyramidal, papillose-reticulate.
Ecology
Moist sites in grass- and bushland; ± 1600 m
Note
Clarke says closest to C. tenax Boeck. but differing in the much narrower spikelets ‘and the nutlet’
Distribution
Flora districts: T3 Flora districts: Known from the type only

Native to:

Angola, Botswana, Burkina, Burundi, Cameroon, Cape Provinces, Congo, Ethiopia, Free State, Gabon, Ghana, Guinea, India, Ivory Coast, Kenya, Lesotho, Madagascar, Malawi, Mali, Mozambique, Namibia, Niger, Nigeria, Northern Provinces, Queensland, Rwanda, Senegal, Sierra Leone, Sudan, Swaziland, Tanzania, Togo, Uganda, Vietnam, Zambia, Zaïre, Zimbabwe

Introduced into:

Mauritius

English
Winged sedge

Cyperus denudatus L.f. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Aug 1, 1892 Baron, R. [4456], Madagascar K000362667
Aug 1, 1892 Drege [s.n.], South Africa K000362861
Aug 1, 1892 Drege [s.n.], South Africa K000362862
Aug 1, 1892 Baron, R. [4456], Madagascar K000362668
Perrier de la Bâthie, J.M.H.A. [13092], Madagascar K000362664 Unknown type material
Perrier de la Bâthie, J.M.H.A. [13092], Madagascar K000362666
Bidgood, S. [5207], Tanzania K000190435
Bidgood, S. [5168], Tanzania K000190396
Perrier de la Bâthie, J.M.H.A. [13092], Madagascar K000362665 Unknown type material
Robinson, E.A. [4021], Zambia Cyperus kasamensis K000362637 isotype

First published in Suppl. Pl.: 102 (1782)

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.
  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • Fischer, E., Rembold, K., Althof, A. & Obholzer, J. (2010). Annotated checklist of the vascular plants of Kakamega forest, Western province, Kenya Journal of East African Natural History 99: 129-226.
  • 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.
  • Lisowski, S. (2009). Flore (Angiospermes) de la République de Guinée Scripta Botanica Belgica 41: 1-517.
  • Lye, K.A. & Thery, P. (2012). Flore du Gabon 44: 1-230. Muséum National D'Histoire Naturelle, Paris.
  • Marais, W. & Araujo, A.C. (2018). Flore des Mascareignes 202: 1-99. IRD Éditions, MSIRI, RBG-Kew, Paris.
  • Sita, P. & Moutsambote, J.-M. (2005). Catalogue des plantes vasculaires du Congo, ed. sept. 2005: 1-158. ORSTOM, Centre de Brazzaville.
  • Sosef, M.S.M. & al. (2006). Check-list des plantes vasculaires du Gabon Scripta Botanica Belgica 35: 1-438.
  • Thiombiano, A., Schmidt, M., Dressler, S., Ouédraogo, A., Hahn, K. & Zizka, G. (2012). Catalogue des plantes vasculaires du Burkina Faso Boissiera 65: 1-391.

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.
  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • Fischer, E., Rembold, K., Althof, A. & Obholzer, J. (2010). Annotated checklist of the vascular plants of Kakamega forest, Western province, Kenya Journal of East African Natural History 99: 129-226.
  • Lisowski, S. (2009). Flore (Angiospermes) de la République de Guinée Scripta Botanica Belgica 41: 1-517.
  • Marais, W. & Araujo, A.C. (2018). Flore des Mascareignes 202: 1-99. IRD Éditions, MSIRI, RBG-Kew, Paris.
  • Sita, P. & Moutsambote, J.-M. (2005). Catalogue des plantes vasculaires du Congo, ed. sept. 2005: 1-158. ORSTOM, Centre de Brazzaville.
  • Sosef, M.S.M. & al. (2006). Check-list des plantes vasculaires du Gabon Scripta Botanica Belgica 35: 1-438.
  • Thiombiano, A., Schmidt, M., Dressler, S., Ouédraogo, A., Hahn, K. & Zizka, G. (2012). Catalogue des plantes vasculaires du Burkina Faso Boissiera 65: 1-391.

Flora of Tropical East Africa

  • E.P. 4, 20 (101): 255 (1936)
  • F.T.A. 8: 338 (1902)
  • Fl. Eth. 6: 439 (1997).
  • Haines & Lye, Sedges & Rushes E. Afr.: 169, figs. 319–321 (1983)
  • Suppl. Pl.: 98 (1782)

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

Plants and People Africa
Common Names from Plants and People Africa http://www.plantsandpeopleafrica.com/
© Plants and People Africa http://www.plantsandpeopleafrica.com http://creativecommons.org/licenses/by/3.0/