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This genus is accepted, and its native range is Tanzania, W. Indian Ocean to Pacific, Tropical America.
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 General Habit
Perennials with creeping rhizomes or stolons
Morphology Culms
Culms scapose or with a few nodes, compressed or terete
Morphology Leaves
Leaves distichous, blade ensiform to terete; ligule 0
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like
Morphology Reproductive morphology Inflorescences
Inflorescence paniculate with many spikelets
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets with 2–10 distichous persistent glumes.
Morphology Reproductive morphology Inflorescences Bracts Glume
Lower glumes sterile, the larger subtending 1–2 bisexual flowers, the upper 1–2 flowers functionally male
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3
Morphology Reproductive morphology Flowers Gynoecium Style
Style 3-fid, base not distinct, thickened
Morphology Reproductive morphology Fruits
Nutlet beaked, 3-ribbed/winged.
Note
50 species; Old and New World tropics and subtropics.

Native to:

Assam, Bangladesh, Bismarck Archipelago, Borneo, Brazil South, Brazil Southeast, Caroline Is., Chatham Is., China South-Central, China Southeast, Comoros, Cuba, Dominican Republic, Fiji, Guyana, Hainan, Haiti, Hawaii, Jawa, Juan Fernández Is., Leeward Is., Madagascar, Malaya, Maluku, Marianas, Marquesas, Mauritius, Nansei-shoto, New Caledonia, New Guinea, New South Wales, New Zealand North, New Zealand South, Norfolk Is., Northern Territory, Ogasawara-shoto, Philippines, Puerto Rico, Queensland, Réunion, Samoa, Seychelles, Society Is., Solomon Is., South Australia, Sulawesi, Sumatera, Tanzania, Tasmania, Tubuai Is., Vanuatu, Victoria, Vietnam, Western Australia, Windward Is.

Extinct in:

Sri Lanka

Machaerina Vahl appears in other Kew resources:

First published in Enum. Pl. Obs. 2: 238 (1805)

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.
  • Govaerts, R. (2004). World Checklist of Monocotyledons Database in ACCESS: 1-54382. The Board of Trustees of the Royal Botanic Gardens, Kew.

Literature

Flora of Tropical East Africa

  • Enum. Pl. 2: 238 (1805)

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