Cyperus tenuiculmis

Cyperus tenuiculmis Boeckeler, Linnaea 36: 286 1870. (syn: Cyperus bracteatus Steud.; Cyperus hemadrii M.R.Almeida [Illegitimate]; Cyperus hexastachyus Nees [Illegitimate]; Cyperus tenuiculmis var. tenuiculmis ; Cyperus wightii Hance [Illegitimate]; Cyperus zollingeri var. condensatus Kük.; Cyperus zollingeri f. levicaulis C.B.Clarke; Cyperus zollingeri var. livingstonii Kük.; Cyperus zollingeri var. longiramulosus Kük.; Cyperus zollingeri var. parvus C.B.Clarke);

Trop. Africa to N. Australia as per WCSP;

Angola; Assam; Bangladesh; Benin; Bismarck Archipelago; Borneo; Burkina; Burundi; Cambodia; Cameroon; Caroline Is.; Central African Repu; Chad; China
South-Central; China Southeast; Congo; East Himalaya; Equatorial Guinea; Gabon; Gambia; Ghana; Guinea; Guinea-Bissau; Gulf of Guinea Is.; Hainan; India; Ivory Coast; Jawa; Kenya; Laos; Lesser Sunda Is.; Liberia; Malawi; Malaya; Mali; Maluku; Myanmar; Nepal; New Guinea; Nigeria; Northern Territory; Philippines; Queensland; Rwanda; Senegal; Sierra Leone; Socotra; Sri Lanka; Sudan; Sulawesi; Sumatera; Taiwan; Tanzania; Thailand; Togo; Uganda; Vietnam; Zare as per Catalogue of Life;

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Culm solitary, to 45 cm, 3-quetrous, ribbed, base incrassate. Leaves as long as culm, or shorter, to 0.25 cm wide, acute, nerves prominent. Inflorescence compound, open, to 6 cm; involucral rays 3, overtopping, the longest to 20 cm; primary rays 3-5. Spikelets 2-10, spicate or racemose, at right angles to rachis. Spikelets narrow-oblong, to 1.5 x 0.1 cm, yellow, compressed, 10-15-flowered; rachilla persistent, wing to 0.1 cm. Glumes imbricate, ovate, 0.25 cm, mucronulate, sides 4-6-nerved, margin hyaline; keel 3-nerved. Stamens 3. Nut ellipsoid, 3-quetrous, 0.1 cm, apiculate, stalked.

(Attributions- Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi from India Biodiversity Portal);
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SK1389 28 AUG 2018 : 9 posts by 3 authors. Attachments (6)- around 500 kb each.

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Please check Cyperus haspan L.

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Cyperus haspan L. is not listed in Nepal.

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It can be Cyperus tenuiculmis, but I need a specimen to confirm the identity

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SK 4002 July 2024 – Grass: 6 very high res. images.
Location: Shivapuri, Kathmandu, Nepal.
Date: 13 July 2024
Altitude: 1851m.
Habitat : Wild
Cyperus corymbosus Rottb. ??

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Who has suggested Cyperus corymbosus?

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Myself !

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Difficult for me to say as per images at
https://powo.science.kew.org/names:304212-1
https://www.gbif.org/species/2713778
https://en.wikipedia.org/wiki/Cyperus_corymbosus
https://www.gbif.org/occurrence/3457221210
https://flora.org.il/en/plants/CYPCOR/
https://tropical.theferns.info/id=Cyperus+corymbosus
Maybe something else.

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Cyperus tenuiculmis Boeckeler ??

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Yes, it seems a much better option as per your earlier identified images at
https://efloraofindia.com/2018/09/29/cyperus-tenuiculmis/

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References:
The Plant List Ver.1.1  WCSP  IPNI  Catalogue of Life  GBIF (with type specimens) BSI Flora of India checklist  Flora of China FOC illustration  Annotated checklist of Flowering plants of Nepal  India Biodiversity Portal  IUCN Red List (LC)  Flora of Zambia  African Plants