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This species is accepted, and its native range is 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: Kenya, Kibwezi, Scheffler 52 (B, syn.); Tanzania, Pare District: W Pare Mts, von Höhnel 10 (B, syn.) & Lushoto District: Mashewa [Mascheua], Holst 8714 (B, syn.)
Morphology General Habit
Perennial, stoloniferous, up to 150 cm tall.
Morphology Culms
Culms 54–130 cm long, 2–3 mm wide, trigonous, with longitudinal grooves, smooth
Morphology Leaves
Leaf blade linear, flat, 22–74 cm long, 6–12 mm wide, with 2 main veins next to primary vein, ± scabrid on the veins, apex acuminate Leaves up to 86 cm long. Leaf sheath (bright) yellow, 4–22 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts 2–4. Leaf-like, spreading, the lowermost 8.5–64 cm long, 4–10 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence compound, primary branches 5–8, 1–14 cm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets in loose clusters on elongated axis, sessile and at the end of primary and secondary branches, 5–20 per cluster, linear, almost terete, 6–18(–30) mm long, 0.9–1.4 mm wide.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes reddish brown with a uncoloured margin, ovate-lanceolate, 3.2–4.1 mm long, 1.3–2.2 mm wide, keel pale green, flattish, few-veined, apex rounded
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 2.4–3.3 mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 1.4–2.2 mm long
Morphology Reproductive morphology Fruits
Nutlet grey, ellipsoid-obovoid, 1.3–1.6 mm long, 0.5–0.6 mm wide, transversely wrinkled with large surface-cells
Ecology
In seasonally wet habitats, bogs and saline swamps; 250–1400 m
Conservation
Least Concern (LC) due to habitat and altitude range
Note
Easy recognizable due to its yellow-coloured leaf sheaths and its nutlet surface; near longus.
Distribution
Flora districts: K4 K7 T2 T3 Range: Not known elsewhere

Native to:

Kenya, Tanzania

Cyperus undulatus Kük. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Peter, A. [10927], Tanzania K000321413 syntype

First published in Repert. Spec. Nov. Regni Veg. 21: 328 (1925)

Accepted by

  • 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

  • E.P. 4, 20 (101): 96 (1936)
  • F.R. 21: 328 (1925)
  • Haines & Lye, Sedges & Rushes E. Afr.: 190, figs. 370, 371 (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