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This genus is accepted, and its native range is Tropics & Subtropics.
A specimen from Kew's Herbarium

[FZ]

Gramineae, T. A. Cope. Flora Zambesiaca 10:4. 2002

Morphology General Habit
Inflorescence a silky spiciform panicle bearing numerous racemes, but these much abbreviated and not easily distinguished; raceme rhachis tough with slender internodes.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets alike, paired, both pedicelled, terete, enveloped in long white hairs from the callus and glumes.
Morphology Reproductive morphology Flowers Florets
Inferior floret represented by a hyaline lemma. Superior floret entire, awnless; lodicules 0; stamens 1–2.

[GB]

nonem

Morphology General Habit
Perennial. Rhizomes absent (3), or elongated (8). Culms erect (9/10), or geniculately ascending (2/10), or decumbent (1/10); 10-87.59-200 cm long. Lateral branches lacking (6/6). Leaf-sheath auricles absent (10), or erect (2). Ligule an eciliate membrane (3), or a ciliolate membrane (6), or a ciliate membrane (2). Leaf-blades linear, or lanceolate (1); herbaceous (10), or coriaceous (1); stiff (8), or firm (3). Leaf-blade midrib conspicuous (1/2), or widened (1/2).
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle with branches tipped by a raceme; exserted (10), or embraced at base by subtending leaf (1). Panicle contracted (2), or spiciform (10). Racemes bearing few fertile spikelets. Rhachis subterete (10/10). Rhachis internodes filiform. Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels filiform (10), or clavate (1); tip widened (1/5), or discoid (4/5).
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (6), or elliptic (5), or oblong (1); subterete; 1.5-3.339-6 mm long; falling entire. Spikelet callus bearded; base truncate.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (6), or elliptic (5), or oblong (1); subterete; 1.5-3.339-6 mm long; falling entire. Spikelet callus bearded; base truncate.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate (9), or oblong (2); membranous; without keels; 3 -veined (5/10), or 4 -veined (3/10), or 5 -veined (7/10), or 6-7 -veined (1/10). Lower glume lateral veins obscure (1), or distinct (10). Lower glume surface smooth, or asperulous (1); glabrous (1), or pilose (1), or villous (9). Lower glume apex obtuse (2/3), or acuminate (1/3). Upper glume lanceolate (9), or oblong (2); membranous; with undifferentiated margins (10), or hyaline margins (1); without keels; 3 -veined (5/10), or 5 -veined (4/10), or 6 -veined (3/10), or 7 -veined (4/10). Upper glume surface smooth, or scabrous (1); glabrous (1), or pilose (1), or villous (9). Upper glume apex obtuse (1/3), or acute (1/3), or acuminate (1/3).
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret linear (1), or oblong (10); hyaline; 0 -veined (9/10), or 1 -veined (1/10); obtuse (8/9), or acuminate (1/9). Fertile lemma linear (1), or ovate (10); hyaline; without keel; 0 -veined (10), or 1 -veined (1). Lemma surface glabrous (10), or puberulous (1). Lemma margins eciliate (10), or ciliate (1). Lemma apex entire (7), or erose (2), or dentate (2); 3 -fid (2/2); obtuse (1/5), or acute (4/5). Palea 0.5 length of lemma; hyaline (9), or membranous (2); 0 -veined (9/9); without keels (9), or 2-keeled (2).
Morphology Reproductive morphology Flowers
Lodicules absent (10), or 2 (1). Anthers 1 (7/10), or 2 (3/10). Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp (2/2); obovoid (1/1).
Distribution
Europe (1), or Africa (1), or Temperate Asia (3), or Tropical Asia (2), or Australasia (2), or Pacific (2), or North America (4), or South America (6).

[FTEA]

Gramineae, W. D. Clayton, S. M. Phillips And S. A. Renvoize. Flora of Tropical East Africa. 1974

Morphology General Habit
Rhizomatous perennials with erect few-noded culms
Morphology Leaves
Leaves mostly basal, the blades narrow and erect; ligule scarious
Morphology Reproductive morphology Inflorescences
Inflorescence a narrow, often spiciform, panicle, its numerous primary branches bearing very short secondary racemes; raceme-rhachis not fracturing at maturity, bearing paired similar spikelets each supported on a slender pedicel
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets lanceolate to oblong, ± terete, enveloped in long silky hairs from callus and glumes; callus very short, truncate; glumes equal, as long as the spikelet, lanceolate to oblong, membranous; lower floret reduced to a lemma, this lanceolate to oblong, shorter than the spikelet, hyaline; upper floret hermaphrodite; lemma lanceolate to oblong, shorter than the spikelet, hyaline, awnless; stamens 1–2; caryopsis ellipsoid.

Native to:

Afghanistan, Albania, Algeria, Angola, Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Bahamas, Baleares, Belize, Benin, Bolivia, Botswana, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Bulgaria, Burkina, Burundi, California, Cameroon, Canary Is., Cape Provinces, Cape Verde, Caroline Is., Cayman Is., Central African Repu, Chad, Chile Central, Chile North, Chile South, Colombia, Comoros, Congo, Corse, Costa Rica, Cuba, Cyprus, Dominican Republic, East Aegean Is., Ecuador, Egypt, El Salvador, Equatorial Guinea, Ethiopia, Fiji, France, Free State, French Guiana, Gabon, Gambia, Ghana, Greece, Guatemala, Guinea, Guinea-Bissau, Gulf of Guinea Is., Guyana, Hainan, Haiti, Honduras, Iran, Iraq, Italy, Ivory Coast, Jamaica, Jawa, Kenya, Kermadec Is., Kriti, Kuwait, KwaZulu-Natal, Lebanon-Syria, Leeward Is., Lesotho, Lesser Sunda Is., Liberia, Libya, Madagascar, Madeira, Malawi, Malaya, Mali, Marianas, Mauritius, Mexico Gulf, Mexico Southeast, Mexico Southwest, Morocco, Mozambique, Myanmar, Namibia, Nevada, New Caledonia, New Guinea, New Mexico, Nicaragua, Niger, Nigeria, Northern Provinces, Oman, Palestine, Panamá, Paraguay, Peru, Philippines, Portugal, Puerto Rico, Rwanda, Samoa, Sardegna, Saudi Arabia, Senegal, Sicilia, Sierra Leone, Sinai, Socotra, Solomon Is., Spain, Sudan, Suriname, Swaziland, Tanzania, Texas, Thailand, Togo, Tonga, Trinidad-Tobago, Tunisia, Turkey, Turkey-in-Europe, Uganda, Uruguay, Utah, Vanuatu, Venezuela, Vietnam, Windward Is., Yemen, Yugoslavia, Zambia, Zaïre, Zimbabwe

Introduced into:

Alabama, Andaman Is., Assam, Bangladesh, Bismarck Archipelago, Borneo, Cambodia, China North-Central, China South-Central, China Southeast, Christmas I., Cocos (Keeling) Is., East Himalaya, Florida, Georgia, India, Inner Mongolia, Japan, Kazakhstan, Kirgizstan, Korea, Laos, Louisiana, Maluku, Manchuria, Mississippi, Nansei-shoto, Nepal, New Zealand North, Nicobar Is., Norfolk Is., North Caucasus, Ogasawara-shoto, Oregon, Pakistan, South Carolina, South China Sea, Sri Lanka, Sulawesi, Sumatera, Tadzhikistan, Taiwan, Tibet, Transcaucasus, Turkmenistan, Uzbekistan, Virginia, Wallis-Futuna Is., West Himalaya, Xinjiang

Imperata Cirillo appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Longhi-Wagner, H.M. [6015], Brazil K001106141
Longhi-Wagner, H.M. [6015], Brazil K001106142

First published in Pl. Rar. Neapol. 2: XXVI (1792)

Accepted by

  • (2020). oi: https://doi.org/10.1101/2020.07.29.226753 epublication.
  • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

Literature

Flora of West Tropical Africa

  • F.T.A. 9: 87 (1917).
  • Pl. Rar. Neap. 2: 26 (1792)

Flora Zambesiaca

  • Pl. Rar. Neapol. 2: 26 (1792).

Flora of Tropical East Africa

  • Pl. Rar. Neap. 2: 26 (1792)

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

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

GrassBase - The Online World Grass Flora
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