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This species is accepted, and its native range is Eritrea to S. Africa, Madagascar.
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

Morphology Reproductive morphology Flowers Gynoecium Style
Style-base persistent, 2.5–2.7 mm long, 0.6–0.7 mm wide, minutely papillose
Figures
Fig. 38, p258
Ecology
Streamsides, ditches, seasonal pools in up to 20 cm of water, often on black cotton soil or in rocky areas; 250–2100 m
Conservation
Least Concern (LC) due to its wide distribution and common habitat.
Note
This species is easy recognized by its yellowish green colour, which is visible even from a distance. When dried the spikelets tend to fall off easily. It can be distinguished from C. cyperoides (Roxb.) Soják by its less congested spikes of spikelets, and having several-flowered spikelets.
Type
Types *: Ethiopia, Gapdia, Schimper 1252 (syntype seen by C.B. Clarke but not seen by Lye) & Schimper 1208 (P, lecto.; HAL, K!, UPS, isolecto) (Note: Steudel’s original collections are now in Paris; the lectotype was chosen by Lye.)
Morphology General Habit
Annual, slender to fairly robust with a minute root system, up to 55 cm tall.
Morphology Culms
Culms tufted, 8–45 cm long, 1.6–3.2 mm wide, trigonous, almost smooth
Morphology Leaves
Leaf blade linear, flat, flaccid, 10–36 cm long, 3.2–6 mm wide, scabrid on margins and primary vein, apex acuminate Leaf sheath green to brown, 3–6.5 cm long. Leaves up to 48 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, spreading to somewhat erect, 2–4, lowermost 12–25 cm long, 3–5.5 mm wide
Morphology Reproductive morphology Inflorescences
Inflorescence a simple to compound anthela, primary branches 5–7, 1.5–7 cm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets in loosely digitate spikes, sessile and at the end of primary and secondary branches, 5–9 per spike, ovoid, several-flowered, strongly flattened, falling off entirely when mature, 4.4–11 mm long, 1–2.4 mm wide, rachis straight.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes loosely imbricate, (yellowish-)brown, lanceolate, winged, 3.1–4.3 mm long, 1.9–2 mm wide, keel green, acute to excurrent, apex with a slightly recurved mucro
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 2.9–3.7 mm long
Morphology Reproductive morphology Fruits
Nutlet reddish-brown, linear-oblong, trigonous, base cuneate.
Distribution
Flora districts: U1 U2 U3 U4 K3 K4 K6 K7 T1 T2 T3 T4 T5 T6 T7 Range: Rwanda, Congo-Kinshasa, Ethiopia, Malawi, Zimbabwe, Botswana, Namibia, South Africa

Native to:

Angola, Botswana, Cape Provinces, Congo, Eritrea, Ethiopia, Free State, Kenya, Madagascar, Namibia, Northern Provinces, Rwanda, Tanzania, Uganda, Zambia, Zaïre, Zimbabwe

Cyperus assimilis Steud. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Schimper [1252], Ethiopia Courtoisina assimilis K000416367 syntype
Dillon, Q., Petit [s.n.], Ethiopia Courtoisina assimilis K000416369
Schimper [1074], Ethiopia Courtoisina assimilis K000416370 Unknown type material
Schimper [1074], Ethiopia Courtoisina assimilis K000416371 Unknown type material
Bidgood, S. [5322], Tanzania Courtoisina assimilis K000190552
Schimper [1252], Ethiopia Courtoisina assimilis K000416368 syntype

First published in Flora 25: 584 (1842)

Accepted by

  • Larridon, I., Reynders, M., Huygh, W., Bauters, K., Vrijdaghs, A., Leroux, O., Muasya, A.M., Simpson, D.A. & Goetghebeur, P. (2011). Taxonomic changes in C3 Cyperus (Cyperaceae) supported by molecular phylogenetic data, morphology, embryology, ontogeny and anatomy Plant ecology and evolution 144: 327-356.

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 Courtoisina assimilis.]
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Courtoisina assimilis.]

Literature

Kew Backbone Distributions

  • Browning, J. & al. (2020). Flora Zambesiaca 14: 1-455. Royal Botanic Gardens, Kew.
  • Edwards, S., Demissew, S., & Hedberg, I. (eds.) (1997). Flora of Ethiopia and Eritrea 6: i-xxviii, 1-586. The National Herbarium, Addis Ababa University, Ethiopia & The Department of Systematic Botany, Upps.
  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • Sita, P. & Moutsambote, J.-M. (2005). Catalogue des plantes vasculaires du Congo, ed. sept. 2005: 1-158. ORSTOM, Centre de Brazzaville.

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