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This species is accepted, and its native range is Mali, Chad, Tanzania to Botswana.
Pycreus demangei J.Raynal

[FWTA]

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

Diagnostic
Similar to P. waillyi Cherm. in its floating habit but having very slender (filiform) stems and leaves and clustered spikelets
Ecology
Flood plains.

[FTEA]

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

Type
Type: Mali, plain of Sorédina, Demange 3114 (P, holo.; K!, iso.)
Morphology General Habit
Annual up to 30 cm high with submerged leaves and emergent inflorescence, neither leaves nor culm able to support themselves out of the water.
Morphology Culms
Culms tufted, 10–18 cm long, 0.4–0.5 mm wide, rounded to trigonous, smooth
Morphology Leaves
Leaves narrowly linear to filiform, flat or inrolled, 7–10.5 cm long, 0.5–1 mm wide, acuminate, glabrous Leaves high up the culm. Leaf sheath 1–2.5 cm long, pale brown, sometimes reddish-brown. Leaves up to 13 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, spreading, 3–4, the lowermost 6–9 cm long, 0.7–0.8 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence simple, primary branches 3–4, 1–4 cm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets in clusters, sessile and at the end of primary branches, 1–4 per cluster, linear-oblong, 5.2–10.5 mm long, 1.5–2 mm wide, axis straight.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes reddish-brown with narrow translucent marginal border, ovate, 1.2–1.7 mm long, 0.9–1.2 mm wide, keel rounded and pale green to yellow, apex obtuse, glabrous
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 0.9–1.4 mm long
Morphology Reproductive morphology Flowers Gynoecium Style
Style 2-branched
Morphology Reproductive morphology Fruits
Nutlet rounded to obovoid, 0.6–0.7 mm long, 0.5–0.6 mm wide, minutely papillose to ± wrinkled, greyish-black
Ecology
In seasonal pools and flooded plains; 1000–1400 m
Conservation
Data Deficient (DD). Very few collections throughout tropical Africa. Probably data deficient due to its habitat and also undercollected.
Note
This species is only partially submerged, and has its inflorescence and part of the leaves above the waterlevel. This is in contrast with P. waillyi Cherm., which is completely submerged except for its spikelets. P. waillyi also has only one spikelet per primary branch (therefore calling it a pedicel), whereas P. demangei can have 1 up to 4 spikelets per primary branch.
Distribution
Flora districts: T5 T7 T8 Range: Mali, Zambia

Native to:

Botswana, Chad, Mali, Tanzania, Zambia, Zimbabwe

Cyperus demangei (J.Raynal) Lye appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 1969 Davey, J.T. [168], Mali Pycreus demangei K000211661
Jan 1, 1969 Davey, J.T. [575], Mali Pycreus demangei K000211662
Demange, R. [3114], Mali Pycreus demangei K000362910 isotype
Demange, R. [3114], Mali Pycreus demangei K000362909 isotype
Demange, R. [3114], Mali Pycreus demangei K001096524 isotype

First published in Nordic J. Bot. 3: 231 (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 demangei.]
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Pycreus demangei.]

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

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/