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This species is accepted, and its native range is Mali, SW. Tanzania to N. Botswana.
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: Mali, Gao to Berra, De Wailly 5340 (P, holo.)
Morphology General Habit
Annual to 33 cm long, slender, completely submerged under water.
Morphology Culms
Culm ± 25 cm long, ± 0.7 mm wide, trigonous, smooth
Morphology Leaves
Leaf blade linear, flat, ± 8–18 cm long, 1 mm wide, acuminate, glabrous Leaves up to 20 cm long. Leaf sheath strawcoloured yellow, 2.5–4 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts 2–3. Leaf-like, 10–11 cm long, 0.8–1.2 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence of one sessile spikelet and 4–5 stalked spikelets.
Morphology Reproductive morphology Flowers Pedicel
Pedicels 5–8.5 cm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets linear-oblong, 8–12 mm long, 1.7–2 mm wide, axis straight to ± curved.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes ovate, reddish-brown, 1.8–2.1 mm long, 1.4–1.6 mm wide, keel rounded, apex rounded to obtuse, glabrous
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma 2-branched
Morphology Reproductive morphology Fruits
Nutlet shiny black, orbicular, biconvex, 1.1–1.2 mm long, 0.9–1 mm wide, minutely papillose
Ecology
Submerged in stream; 2150 m
Conservation
Data Deficient (DD). Very few collections throughout tropical Africa. Probably data deficient due to its habitat and therefore undercollected. There is no information about the status of the habitats in which the plants occur.
Distribution
Flora districts: T7 Range: Mali, Congo-Kinshasa

[FWTA]

Cyperaceae, Miss S. S. Hooper. Flora of West Tropical Africa 3:2. 1972

Morphology Reproductive morphology Inflorescences
Submerged or floating with an inflorescence of spikelets borne singly
Ecology
In shallow water.

Native to:

Botswana, Mali, Tanzania, Zambia, Zaïre

Cyperus waillyi (Cherm.) Lye appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Davey, J.T. [6], Mali Pycreus waillyi K000391921
Wailly, de M. [5340], Mali Pycreus waillyi K000362905 Unknown type material

First published in R.W.Haines & K.A.Lye, Sedges & Rushes E. Afr., App. 3: 2 (1983)

Not 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. [Cited as Pycreus waillyi.]
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Pycreus waillyi.]

Literature

Kew Backbone Distributions

  • Browning, J. & al. (2020). Flora Zambesiaca 14: 1-455. Royal Botanic Gardens, Kew.
  • Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae Flora of Tropical East Africa: 1-466.

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of West Tropical Africa
Flora of West Tropical 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