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This species is accepted, and its native range is Sudan to Mozambique, Madagascar.

[FTEA]

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

Type
Type: Sudan, Tinne s.n. (W, holo.)
Morphology General Habit
Perennial, fairly robust, up to 54 cm tall, with an erect or creeping subwoody rhizome from which new culms develop at irregular intervals, often floating.
Morphology Culms
Culms green, 20–70 cm long, 3–5 mm wide, triquetrous to winged, smooth
Morphology Leaves
Leaf blade absent Leaves with leaf sheath reddish-brown to purple, very wide, ending in a thin ligule and a thick triangular apex, short basal sheaths as short as 1 cm, longer sheaths up to 20 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bract leaf- to bract-like, sometimes culm-like, erect, 8–12 mm long
Morphology Reproductive morphology Inflorescences
Inflorescence capitate.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets 3–15(–20) per head, ovoid, 6–15 mm long, 4–10 mm wide, rachilla straight.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes reddish-brown, ovate, 4.2–6 mm long, 2.4–3.7 mm wide, with large surface cells, 3–9-veined, keel thicker, scabrid towards apex, apex acute
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 3–5.4 mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 0.9–1.6 mm long
Morphology Reproductive morphology Fruits
Nutlet brown, surrounded by yellow sterile tissue, 4.2–5.5 mm long, 1–1.4 mm wide, nutlet ellipsoid-oblong, 1.7–2.4 mm long, 0.9–1.1 mm wide, minutely papillose.
Ecology
Muddy areas, on swampy ground, in (dried-up) pools and in shallow water; 10–950 m
Conservation
Least Concern due to its wide distribution
Note
This species is very closely related to C. pectinatus Vahl. Both species have nutlets surrounded by corky tissue to make it long-floating. C. colymbetes has much thicker and fewer culms which are almost winged. It also has larger involucral bracts.
Distribution
Range: Sudan, Somalia, Mozambique Flora districts: U2 K5 K7 T3 T4 T6

[FSOM]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Fairly robust perennial with an erect or creeping subwoody rhizome, from which new stems develop at irregular intervals
Morphology Stem
Stems 30–70 cm long and 3–5 mm thick, sharply triangular to winged, green, glabrous
Morphology Leaves
Leaf-blades absent; sheaths very wide, reddish brown to purple, ending in a thin ligule and a thick triangular apex
Morphology Reproductive morphology Inflorescences
Inflorescence a congested pale and almost whitish anthela with sessile spikelets only; solitary involucral bract leafy to stem-like, 8–12 mm long and continuing in the direction of the stem; anthela 1–2.5 cm in diam., consisting of 6–15 crowded spikelets
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets 8–12 x 5–7 mm, ovate, light green to pale reddish brown, 12–30-flowered
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes 4.5–5.5 mm long, ovate, reddish brown with large surface-cells, 3–9-nerved (but nerves often indistinct); midrib thicker and often scabrid at apex, not excurrent
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3
Morphology Reproductive morphology Flowers Gynoecium Style
Style 3-branched, or rarely 2-branched
Morphology Reproductive morphology Fruits
Nutlet 4–5 x 1.2–1.4 mm including a 1–2 mm long narrow beak and a 0.8–1.2 mm long basal tissue; the nutlet brown, surrounding sterile tissue yellow.
Distribution
S2 scattered in tropical Africa and Madagascar.
Ecology
Altitude below 100 m.

Native to:

Kenya, Madagascar, Mozambique, Somalia, Sudan, Tanzania, Uganda

Cyperus colymbetes Kotschy & Peyr. appears in other Kew resources:

First published in Pl. Tinn.: 49 (1867)

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

Flora of Somalia

  • Flora Somalia, Vol 4, (1995) Author: by K. A. Lye [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • E.P. 4, 20 (101): 289 (1936)
  • F.T.A. 8: 317 (1902)
  • Fl. Somalia 4: 119 (1995).
  • Haines & Lye, Sedges & Rushes E. Afr.: 173, fig. 329 (1983)
  • Pl. Tinn. 49. t. 24 (1867)

Flora of Somalia
Flora of Somalia
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/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