Cymbopogon citratus (DC.) Stapf (S. India, Sri Lanka; Introduced into: Aldabra, Algeria, Angola, Argentina Northeast, Bahamas, Bangladesh, Belize, Benin, Bolivia, Borneo, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Cambodia, Cameroon, Caroline Is., Central African Repu, Chile North, China South-Central, China Southeast, Colombia, Comoros, Cook Is., Costa Rica, Cuba, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Fiji, Florida, French Guiana, Galápagos, Gambia, Ghana, Guatemala, Guinea, Guinea-Bissau, Gulf of Guinea Is., Guyana, Hainan, Haiti, Hawaii, Honduras, Ivory Coast, Jamaica, Jawa, Kazan-retto, Laos, Leeward Is., Lesser Sunda Is., Liberia, Madagascar, Malaya, Marianas, Marshall Is., Mauritius, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Morocco, Myanmar, Netherlands Antilles, New Caledonia, New Guinea, Nicaragua, Panamá, Peru, Philippines, Puerto Rico, Rodrigues, Rwanda, Réunion, Samoa, Senegal, Seychelles, Sierra Leone, Society Is., Sulawesi, Sumatera, Suriname, Taiwan, Tanzania, Thailand, Tonga, Trinidad-Tobago, Vanuatu, Vietnam, Windward Is., Zaïre as per POWO)

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Cymbopogon coloratus (Hook.f.) Stapf (S. India, Indo-China: India, Myanmar, Vietnam as per POWO)

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Cymbopogon distans (Nees ex Steud.) W.Watson (Pakistan to Central China: China North-Central, China South-Central, Nepal, Pakistan, Tibet, West Himalaya as per POWO)

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Cymbopogon flexuosus (Nees ex Steud.) W.Watson (Indian Subcontinent to Indo-China: Assam, Bangladesh, East Himalaya, India, Myanmar, Nepal, Thailand, Vietnam, West Himalaya; Introduced into: Andaman Is., Bahamas, China South-Central, Egypt, Florida, Jawa, Lesser Sunda Is., Madagascar, Malaya, Mauritius, New Guinea, Seychelles, Sumatera as per POWO)

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Cymbopogon iwarancusa (Jones) Schult. (In C.jwarancusa, the leaves are linear, long and parallel at the base, whereas in C.martinii, the leaves are lanceolate and cordate at the base. C.martinii is seen as individual culms or in small clumps whereas C.j is found as a thick clump)
(Türkiye to Socotra and S. Central China: Afghanistan, Assam, China South-Central, East Himalaya, Gulf States, India, Iran, Iraq, Lebanon-Syria, Nepal, Oman, Pakistan, Socotra, Tibet, Turkey, Vietnam, West Himalaya, Yemen as per POWO)

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Cymbopogon martini (Roxb.) W.Watson (In C.jwarancusa, the leaves are linear, long and parallel at the base, whereas in C.martinii, the leaves are lanceolate and cordate at the base. C.martinii is seen as individual culms or in small clumps whereas C.j is found as a thick clump)
(Indian Subcontinent to Indo-China: Bangladesh, East Himalaya, India, Myanmar, Nepal, Pakistan, Vietnam, West Himalaya; Introduced into: Andaman Is., Brazil Southeast, Central African Repu, China South-Central, Egypt, Jawa, Madagascar, Malaya, Seychelles as per POWO)

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Cymbopogon nardus (L.) Rendle ? (South Sudan to S. Africa and Indo-China: Angola, Assam, Bangladesh, Botswana, Burundi, Cambodia, Cape Provinces, East Himalaya, Free State, India, Kenya, KwaZulu-Natal, Laos, Lesotho, Madagascar, Mozambique, Myanmar, Northern Provinces, Rwanda, Seychelles, Sri Lanka, Sudan, Swaziland, Tanzania, Uganda, Vietnam, West Himalaya, Zaïre, Zimbabwe; Introduced into: Andaman Is., Bahamas, Bismarck Archipelago, Borneo, Brazil Northeast, Brazil West-Central, Caroline Is., China South-Central, China Southeast, Colombia, Cuba, Dominican Republic, Egypt, Fiji, Florida, Hainan, Haiti, Honduras, Jamaica, Jawa, Leeward Is., Lesser Sunda Is., Malaya, Maldives, Maluku, Marianas, Mexico Northeast, Mexico Southeast, Mexico Southwest, Nansei-shoto, New Guinea, Nicobar Is., Nigeria, Niue, Philippines, Puerto Rico, Sumatera, Taiwan, Trinidad-Tobago as per POWO)

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Cymbopogon (Poaceae) with comparative images:
Pl. go through‎ Cymbopogon (Poaceae) page with comparative images of species in efloraofindia.
I request you to pl. go through & point out mistakes, if any. I hope this will aid in identification in future. If anybody can send images of other species of this genus (for incorporation in the website), if any, or can identify unidentified images, it will be really nice. Pl. circulate it widely, for the benefit of all concerned.
Most of the identifications have been done by Sh. Manoj Chandran ji.