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This species is accepted, and its native range is S. Tanzania to S. 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: Tanzania, Iringa District: Lupembe, on rocks near Mpaponzi, Schlieben 436 (B, lecto.; BM, K!, isolecto., chosen by Lye)
Morphology General Habit
Perennial, slender, with minute swollen plant-base, up to 13 cm tall.
Morphology Culms
Culms tufted, 4–11.5 cm long, 0.4–0.6 mm wide, trigonous, smooth
Morphology Leaves
Leaves up to 13 cm long. Leaf blade linear, folded, linear, 4–11 cm long, 0.9–1.4 mm wide, glabrous, apex acute Leaf sheath pale brown, sometimes slightly breaking up into fibers, 1–2 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, spreading, 2, lowermost 2–4.5 cm long, 0.6–1 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence capitate.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets 3–5 per head, linear-lanceolate, 4.6–12.7 mm long, 1.4–1.6 mm wide, rachis straight to slightly curved, few to 10-flowered.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes reddish-brown, elliptic-lanceolate, 1.9–2.1 mm long, 0.9–1.1 mm wide, with 3–5 prominent but thin uncoloured veins on each side of the keel, keel greenish, apex mucronate, recurved
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 1–2
Morphology Reproductive morphology Fruits
Nutlet dark purplish-black, ellipsoid-obovoid, trigonous, 0.8–1.1 mm long, 0.5–0.8 mm wide, minutely papillose in longitudinal rows, apiculate.
Ecology
In temporarily wet habitats, on damp shallow soil over rocks; ± 1350 m
Conservation
DD; lacks information on threats
Note
C. tanganyicanus is closely related to C. kirkii but has smaller glumes without a pale margin and bigger nutlets.
Distribution
Range: Not known elsewhere Flora districts: T7

[FTEA]

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

Type
Type: Zambia, Lower Zambesi, near Lupata, Kirk 1 (K!, syn.); Zambia, Manganja Hills, Meller s.n. (K!, syn.)
Morphology General Habit
Perennial, slender, tussocky, the base of the plant slightly swollen and covered with some fibrous remains of old leaf sheaths, up to 21 cm tall.
Morphology Culms
Culms tufted, 10–19 cm long, 0.6–0.9 mm wide, trigonous, smooth
Morphology Leaves
Leaf sheath brown, 1–3 cm long. Leaves up to 21 cm long. Leaf blade linear, flat but strongly inrolled when dry, 6–18 cm long, 0.6–1 mm wide, glabrous, apex acuminate
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, spreading, 2, lowermost 2.5–6.5 cm long, 0.7–1 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence capitate.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets 4–15 per head, linear-lanceolate, 7–15 mm long, 1.9–2.4 mm wide, straight or slightly curved, with 20–40 glumes per spikelet.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes pale reddish-brown with an uncoloured margin, ovate, 1.9–2.4 mm long, 1–1.3 mm wide, 3–4 prominent ribs on either side of the keel, keel excurrent, apex acute to acuminate
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 1.8–2.4 mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 0.6–1.1 mm long
Morphology Reproductive morphology Fruits
Nutlet grey to almost black, obovoid to pear-shaped, trigonous, 0.8–0.9 mm long, 0.4–0.8 mm wide, papillose in longitudinal rows, apiculate.
Ecology
On shallow peaty soils in rock crevices and on rocky outcrops; 300–900 m
Conservation
Least concern (LC)
Note
" C. kirkii is closely related to C. tanganyinacus but has larger glumes with a pale margin, and smaller nutlets. It also is similar to C. boreobellus which has slightly larger glumes and only occurs in Kenya.
Distribution
Flora districts: T8 Range: Zambia, Malawi, Mozambique, Zimbabwe

Native to:

Angola, Botswana, Cape Provinces, Free State, KwaZulu-Natal, Lesotho, Malawi, Mozambique, Northern Provinces, Swaziland, Tanzania, Zambia, Zimbabwe

Cyperus semitrifidus Schrad. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Aug 1, 1892 South Africa K000362864
Aug 1, 1892 Drege [s.n.], South Africa K000362846
Zeyher, C.L.P. [4364], South Africa K000362845
Drege [s.n.], South Africa K000362863
Bidgood, S. [5543], Tanzania Cyperus tanganyicanus K000468881
Bidgood, S. [5437], Tanzania Cyperus tanganyicanus K000190667
Bidgood, S. [6014], Tanzania Cyperus tanganyicanus K000468411
Bidgood, S. [5243], Tanzania Cyperus tanganyicanus K000190471
Kirk, Dr J. [s.n.], Mozambique Cyperus kirkii K000362654
Meller, C.J. [s.n.], Zambia Cyperus kirkii K000362638

First published in Anal. Fl. Cap. 1: 6 (1832)

Accepted by

  • Browning, J. & al. (2020). Flora Zambesiaca 14: 1-455. 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.

Literature

Kew Backbone Distributions

  • Browning, J. & al. (2020). Flora Zambesiaca 14: 1-455. Royal Botanic Gardens, Kew.
  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.

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/