As per efi thread:
There are various species of Setaria in India having such plicate leaves.

Some of the distinguishingly visible characters are as follows:
1. Setaria barbata – The actual Setaria barbata does not have plicate leaves, though sometimes the basal portion may be plicate. Most Setaria barbata in herbaria are misidentified and actual Setaria barbata is a rare plant.
2. Setaria poiretiana – This is an ornamental plant that has escaped into the wild whereby the original dense panicled nature as shown in the Holotype at Kew has got lost and is represented by several short and spaced horizontal racemes with densely packed spikelets with subtending bristles visible among a few spikelets and hairy sheath and rachis. It is now invasive and found all over roadsides and gardens in coastal areas with high rainfall areas like Kerala, Assam, WB, etc. Hence, the photographs in this thread are those of this species. It matches with K000281854 and K000281855 with respect to the spaced racemes and densely packed spikelets but probably broken down in its hybrid vigour as it escaped into the wild.
3. Setaria homonyma – This is a rather common plant in North India with short and spaced horizontal racemes but with loosely scattered spikelets each with a subtending bristle.
4. Setaria palmifolia – This is usually found only in forest areas with dense shade and is a taller plant with a long raceme, with scattered ascending racemes of spikelets with short and occasional bristles.
5. Setaria paniculifera – This is also found in densely shaded forest areas and are giant grasses having giant panicles with occasional but long subtending bristles.
6. Setaria megaphylla – This is a garden plant having very large plicate leaves
7. Setaria plicata – This is a very dwarf perennial plant with small plicate leaves and short panicles. It is rather rare and found from only a few collections in India, Srilanka and Myanmar.
Other Setaria species with plain leaves (not plicate) in India:
8. Setaria verticillata – dense cylindrical panicle with sticky bristles (due to retrorse barbs)
9. Setaria intermedia/ tomentosa – dwarf plant with narrow panicle
10. Setaria italica – dense heavy drooping panicle due to weight of seeds – found in cultivation
11. Setaria pumila/pallide-fusca – small cylindrical short spike like panicle with small spikelets (mostly in peninsular india)
12. Setaria glauca – small to medium length spike like panicle with larger spikelets and glaucous nature of stem. (mostly in northern India)
13. Setaria viridis – similar to glauca, but with larger green panicles and bristles (in higher altitudes and trans-himalayas)
14. Setaria sphacelata – tall grass with very long spike like cylindrical inflorescence – usually grown as fodder grass
15. Setaria forbesiana – similar to viridis but more open and drooping panicle
16. Setaria geniculata – similar to pumila, but with several geniculate branches from the base
If seen under a microscope, one can observe the differences in comparative sizes of the floral parts and the rugose nature of the upper lemmas, stamens, ligule, hairyness, leaf surface, venation pattern, indumentum of basal portion of stem, etc.
However, it should be noted that a “species” is just an artificial system of classification and the actual ability to naturally interbreed to produce fertile offsprings has not been tested, though various observations of intermediate forms may be visible. Rarity of a species is actually the measure of our ignorance about the species. The various ‘species’ presently reported may also be a result of hybridisation, polyploidy and other genetic reasons and may not be true ‘species’. One need to go deep to find that out by repeated field and lab experiments. Even genetic experiments (genome sequencing) only tells the amount of difference in genetic character, but may not always clearly amount to describing or distinguishing species. Characters also depend on the expression of gene due to environmental factors including effects of other gene and their expressions, silencing of genes, etc. So, a mixture of morphological characters, anatomical characters, genetics and biogeography needs to be considered for assigning species status to a taxa. Until then, one needs to respect the variations observed by various taxonomists and put all those information in one place to capture all variations across all populations.

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Setaria barbata (Lam.) Kunth (Tropical & Subtropical Old World: Andaman Is., Assam, Bangladesh, Benin, Borneo, Burkina, Cameroon, Cape Verde, Central African Repu, Chad, Comoros, Congo, Djibouti, East Himalaya, Eritrea, Ethiopia, Gambia, Ghana, Guinea, Guinea-Bissau, Gulf of Guinea Is., India, Ivory Coast, Jawa, Kenya, Lesser Sunda Is., Madagascar, Malaya, Mali, Mozambique, Myanmar, New Guinea, Niger, Nigeria, Philippines, Senegal, Seychelles, Sierra Leone, Solomon Is., Sri Lanka, Sudan, Sumatera, Tanzania, Thailand, Togo, Uganda, Vietnam, West Himalaya, Yemen, Zambia, Zaïre; Introduced into: Brazil North, Brazil Northeast, Colombia, Cuba, Dominican Republic, Fiji, Florida, French Guiana, Haiti, Jamaica, Kazan-retto, Leeward Is., Mauritius, Mississippi, Nansei-shoto, New Caledonia, Ogasawara-shoto, Panamá, Puerto Rico, Rodrigues, Réunion, Taiwan, Trinidad-Tobago, Venezuela, Windward Is. as per POWO)

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Setaria glauca (L.) P.Beauv. (From efi thread: Setaria pumila is similar to S.glaucabut has smaller spikelets (upto 2.25mm long) than S.glauca (3mm long). The wrinlkes on the upper glume are fine in S.pumila and coarse in S.glauca. S.glauca is also considered a polyploid form of S.pumila, with 2n=18 for pumila and 2n=36 for glaucaThough both the species are found throughout India, S.pumila is the common grass out of the two in peninsular India whereas S.glauca is more common in the Gangetic plain and sub Himalayan tract)

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Setaria homonyma (Steud.) Chiov. (Cameroon to Ethiopia and S. Africa, Indian Subcontinent to Myanmar: Angola, Botswana, Burundi, Cameroon, Caprivi Strip, Congo, East Himalaya, Ethiopia, Gabon, India, Kenya, KwaZulu-Natal, Malawi, Mozambique, Myanmar, Namibia, Northern Provinces, Rwanda, Sudan, Tanzania, Uganda, West Himalaya, Zambia, Zaïre, Zimbabwe as per POWO)


Setaria intermedia Roem. & Schult. (Eritrea to Tanzania, Arabian Peninsula, Indian Subcontinent to China (Yunnan) and Indo-China: Andaman Is., Bangladesh, China South-Central, East Himalaya, Eritrea, India, Myanmar, Nepal, Oman, Pakistan, Réunion, Socotra, Sri Lanka, Tanzania, Thailand, West Himalaya, Yemen as per POWO)

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Setaria italica (L.) P.Beauv. (cultigen from China; Introduced into: Afghanistan, Alabama, Alberta, Algeria, Amur, Arizona, Arkansas, Assam, Austria, Bangladesh, Belgium, Borneo, Brazil South, Brazil Southeast, Brazil West-Central, British Columbia, Bulgaria, California, Cambodia, Cape Provinces, Cayman Is., Central European Rus, China South-Central, Colombia, Colorado, Connecticut, Cuba, Cyprus, Czechoslovakia, Delaware, District of Columbia, East European Russia, East Himalaya, Egypt, Florida, France, Free State, French Guiana, Georgia, Germany, Greece, Hainan, Hawaii, Hungary, Illinois, India, Indiana, Inner Mongolia, Iowa, Iran, Iraq, Italy, Japan, Jawa, Kansas, Kazakhstan, Kentucky, Khabarovsk, Kirgizstan, Korea, Kriti, Krym, KwaZulu-Natal, Laos, Lebanon-Syria, Leeward Is., Lesser Sunda Is., Libya, Louisiana, Maine, Malawi, Malaya, Maldives, Maluku, Manchuria, Manitoba, Maryland, Massachusetts, Mauritius, Mexico Central, Mexico Southeast, Michigan, Minnesota, Mississippi, Missouri, Montana, Mozambique, Myanmar, Nansei-shoto, Nebraska, Nepal, New Brunswick, New Guinea, New Hampshire, New Jersey, New Mexico, New York, New Zealand North, New Zealand South, North Carolina, North Caucasus, North Dakota, Northern Provinces, Nova Scotia, Ohio, Oklahoma, Oman, Ontario, Oregon, Pakistan, Palestine, Pennsylvania, Philippines, Poland, Primorye, Québec, Rhode I., Romania, Réunion, Sardegna, Saudi Arabia, South Carolina, South Dakota, South European Russi, Spain, Sri Lanka, Sumatera, Switzerland, Tadzhikistan, Taiwan, Tasmania, Tennessee, Texas, Thailand, Tibet, Transcaucasus, Turkey, Turkey-in-Europe, Turkmenistan, Ukraine, Uzbekistan, Vermont, Vietnam, Virginia, Washington, West Himalaya, West Virginia, Windward Is., Wisconsin, Wyoming, Xinjiang, Yemen, Yugoslavia, Zimbabwe as per POWO)

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Setaria palmifolia (J.Koenig) Stapf (Tropical & Subtropical Asia to E. Australia: Andaman Is., Assam, Bangladesh, Borneo, China South-Central, China Southeast, East Himalaya, Hainan, India, Japan, Jawa, Laos, Lesser Sunda Is., Malaya, Maluku, Myanmar, Nansei-shoto, Nepal, New Guinea, New South Wales, Nicobar Is., Philippines, Queensland, Solomon Is., Sri Lanka, Sulawesi, Sumatera, Taiwan, Thailand, Tibet, Vietnam, West Himalaya; Introduced into: Belize, Brazil North, Brazil South, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Equatorial Guinea, Fiji, Florida, Guatemala, Haiti, Hawaii, Honduras, Jamaica, Leeward Is., Madeira, Marquesas, Mexico Gulf, Mexico Northwest, Mexico Southeast, Mexico Southwest, Morocco, New Zealand North, Nicaragua, Norfolk Is., Pakistan, Panamá, Puerto Rico, Samoa, South Australia, Trinidad-Tobago, Venezuela, Western Australia, Windward Is. as per POWO)

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Setaria poiretiana (Schult.) Kunth (Nigeria to Ethiopia and Zambia, India to Myanmar, SE. Mexico to S. Tropical America, Trinidad: Bolivia, Brazil South, Brazil Southeast, Brazil West-Central, Burundi, Cameroon, Congo, Costa Rica, Ecuador, Ethiopia, French Guiana, Gulf of Guinea Is., Guyana, Honduras, India, Kenya, Mexico Southeast, Myanmar, Nicaragua, Nigeria, Peru, Rwanda, Sudan, Suriname, Tanzania, Trinidad-Tobago, Uganda, Venezuela, Zambia, Zaïre as per POWO)

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Setaria pumila (Poir.) Roem. & Schult. (From efi thread: Setaria pumila is similar to S.glauca, but has smaller spikelets (upto 2.25mm long) than S.glauca (3mm long). The wrinlkes on the upper glume are fine in S.pumila and coarse in S.glauca. S.glauca is also considered a polyploid form of S.pumila, with 2n=18 for pumila and 2n=36 for glauca. Though both the species are found throughout India, S.pumila is the common grass out of the two in peninsular India whereas S.glauca is more common in the Gangetic plain and sub Himalayan tracts)
(Old World: Afghanistan, Albania, Algeria, Altay, Andaman Is., Angola, Assam, Austria, Azores, Baleares, Bangladesh, Benin, Bismarck Archipelago, Botswana, Bulgaria, Burkina, Burundi, Cameroon, Canary Is., Cape Provinces, Cape Verde, Central African Repu, Central European Rus, Chad, China North-Central, China South-Central, China Southeast, Chita, Corse, Cyprus, Czechoslovakia, Djibouti, East European Russia, East Himalaya, Egypt, Eritrea, Ethiopia, France, Free State, Gambia, Ghana, Greece, Guinea, Guinea-Bissau, Hainan, Hungary, India, Inner Mongolia, Italy, Ivory Coast, Japan, Jawa, Kenya, Korea, Krasnoyarsk, Kriti, Krym, Kuwait, KwaZulu-Natal, Laos, Lebanon-Syria, Lesotho, Lesser Sunda Is., Libya, Madagascar, Madeira, Malawi, Malaya, Mali, Maluku, Manchuria, Mauritania, Mauritius, Morocco, Mozambique, Myanmar, Namibia, Nansei-shoto, Nepal, New Guinea, Nicobar Is., Niger, Nigeria, North Caucasus, Northern Provinces, Northwest European R, Oman, Pakistan, Palestine, Philippines, Portugal, Primorye, Romania, Rwanda, Réunion, Sardegna, Saudi Arabia, Senegal, Sicilia, Sierra Leone, Sinai, Socotra, Solomon Is., Somalia, South European Russi, Spain, Sri Lanka, Sudan, Sulawesi, Sumatera, Swaziland, Tadzhikistan, Taiwan, Tanzania, Thailand, Tibet, Togo, Transcaucasus, Tunisia, Turkey-in-Europe, Uganda, Ukraine, Vietnam, West Himalaya, Xinjiang, Yemen, Yugoslavia, Zambia, Zaïre, Zimbabwe; Introduced into: Alabama, Alberta, Amur, Arizona, Arkansas, Baltic States, Belgium, Brazil Northeast, Brazil Southeast, British Columbia, California, Caroline Is., Colombia, Colorado, Connecticut, Cook Is., Delaware, District of Columbia, Dominican Republic, East Aegean Is., Fiji, Florida, Georgia, Germany, Great Britain, Haiti, Hawaii, Idaho, Illinois, Indiana, Iowa, Jamaica, Kansas, Kentucky, Kermadec Is., Louisiana, Maine, Manitoba, Marcus I., Marianas, Marshall Is., Maryland, Massachusetts, Mexico Central, Mexico Northeast, Mexico Northwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Netherlands, Nevada, New Brunswick, New Caledonia, New Hampshire, New Jersey, New Mexico, New York, New Zealand North, New Zealand South, Newfoundland, Norfolk Is., North Carolina, North Dakota, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Peru, Pitcairn Is., Poland, Prince Edward I., Puerto Rico, Québec, Rhode I., Samoa, Saskatchewan, Society Is., South Carolina, South Dakota, St.Helena, Sweden, Switzerland, Tennessee, Texas, Tonga, Tubuai Is., Utah, Vanuatu, Venezuelan Antilles, Vermont, Virginia, Washington, West Virginia, Windward Is., Wisconsin, Wyoming as per POWO)

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Setaria sphacelata (Schumach.) Stapf & C.E.Hubb. ex Moss (Introduced) (Tropical & S. Africa, Madagascar: Angola, Benin, Botswana, Burkina, Burundi, Cameroon, Cape Provinces, Caprivi Strip, Central African Repu, Chad, Congo, Eritrea, Ethiopia, Free State, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Kenya, KwaZulu-Natal, Lesotho, Madagascar, Malawi, Mali, Mauritania, Mozambique, Namibia, Niger, Nigeria, Northern Provinces, Rwanda, Senegal, Sierra Leone, Somalia, Sudan, Swaziland, Tanzania, Togo, Uganda, Zambia, Zaïre, Zimbabwe; Introduced into: Alabama, Andaman Is., Argentina Northeast, Argentina Northwest, Bangladesh, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, California, Cambodia, Caroline Is., Cook Is., Costa Rica, East Himalaya, Easter Is., Ecuador, Fiji, Florida, Hawaii, Honduras, India, Japan, Jawa, Laos, Marianas, Mauritius, Mexico Central, Mexico Southeast, Mexico Southwest, Mississippi, Myanmar, New Guinea, Nicaragua, Paraguay, Philippines, Réunion, Saudi Arabia, Society Is., Solomon Is., Sri Lanka, St.Helena, Taiwan, Thailand, Uruguay, Vietnam, West Himalaya, Yemen as per POWO)

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Setaria verticillata (L.) P.Beauv.
(Setaria verticillata, commonly found in waste places. You can identify it from other species of Setaria from its retrose barbs on the bristles. For this try running your fingers from bottom to top of the inflorescence. If your fingers cannot run smooth, then the barbs are retrose (backward curved). In all other species, you can run your fingers smoothly without any hurdle;

Setaria palmifolia, S.paniculifera, S.poiretiana, S.plicata, S.barbata, S.megaphylla, S.homonyma are species not only having plicate leaves, but also has a branched, spreading inflorescence rather than a contracted panicle. S.italica, S.geniculata, S.intermedia, S.verticillata and S.gracillima, S.forbesiana, have contracted panicles, but leaves are not plicate. S.glauca, S.pumila, S.sphacelata and S.viridis also are not plicate leaved, but have very contracted panicles such that they look like a cylindrical spike. Out of these, S.italica is cultivated as a millet and S.sphacelata is cultivated as a fodder grass. Other Setarias mentioned in Flora of China are not reported from India)
(Tropical & Subtropical Old World: Afghanistan, Albania, Algeria, Andaman Is., Angola, Azores, Baleares, Bangladesh, Belarus, Benin, Botswana, Bulgaria, Burkina, Burundi, Cambodia, Cameroon, Cape Provinces, Cape Verde, Central European Rus, Chad, China South-Central, Comoros, Corse, Cyprus, Djibouti, East Himalaya, Egypt, Eritrea, Ethiopia, France, Free State, Gambia, Ghana, Greece, Gulf States, India, Inner Mongolia, Iran, Iraq, Italy, Ivory Coast, Jawa, Kazakhstan, Kenya, Kirgizstan, Kriti, Krym, Kuwait, KwaZulu-Natal, Laccadive Is., Laos, Lebanon-Syria, Lesotho, Lesser Sunda Is., Libya, Madagascar, Malawi, Mali, Mauritania, Morocco, Mozambique, Myanmar, Namibia, Nepal, New South Wales, Nicobar Is., Niger, Nigeria, North Caucasus, Northern Provinces, Northern Territory, Oman, Pakistan, Philippines, Portugal, Queensland, Romania, Rwanda, Sardegna, Saudi Arabia, Senegal, Sicilia, Sinai, Socotra, Somalia, South Australia, South European Russi, Spain, Sri Lanka, Sudan, Sulawesi, Swaziland, Tadzhikistan, Taiwan, Tanzania, Tasmania, Thailand, Togo, Transcaucasus, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Uganda, Ukraine, Uzbekistan, Victoria, Vietnam, West Himalaya, Western Australia, Western Sahara, Yemen, Yugoslavia, Zambia, Zaïre, Zimbabwe; Introduced into: Alabama, Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Ascension, Austria, Bahamas, Baltic States, Belgium, Bermuda, Brazil Northeast, Brazil South, Brazil Southeast, British Columbia, California, Chatham Is., Chile Central, Chile North, Colombia, Colorado, Connecticut, Cuba, Czechoslovakia, Delaware, District of Columbia, Dominican Republic, East Aegean Is., Ecuador, Florida, Germany, Great Britain, Guatemala, Haiti, Hawaii, Hungary, Idaho, Illinois, Indiana, Iowa, Japan, Kansas, Kentucky, Korea, Krasnoyarsk, Louisiana, Madeira, Maine, Manitoba, Marianas, Marquesas, Marshall Is., Maryland, Massachusetts, Mauritius, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Missouri, Montana, Nansei-shoto, Nebraska, Netherlands, Netherlands Antilles, Nevada, New Caledonia, New Hampshire, New Jersey, New Mexico, New York, New Zealand North, New Zealand South, Norfolk Is., North Dakota, Northwest Territorie, Ohio, Oklahoma, Ontario, Oregon, Palestine, Paraguay, Pennsylvania, Peru, Pitcairn Is., Poland, Primorye, Québec, Rhode I., Réunion, South Dakota, St.Helena, Switzerland, Texas, Uruguay, Utah, Venezuela, Vermont, Virginia, Wake I., Washington, West Virginia, Wisconsin, Wyoming as per POWO)
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Setaria viridis (L.) P.Beauv. (Similar to S. pumila in compact spikes with antrorsely scabrid bristles, but differing in usually green bristles, and several spikelets per branch, as also upper glume being almost as long as spikelet or slightly shorter)
(Old World to Central & SE. Australia: Afghanistan, Albania, Algeria, Altay, Amur, Austria, Baleares, Bangladesh, Belgium, Bulgaria, Buryatiya, Cambodia, Canary Is., Chad, China North-Central, China South-Central, China Southeast, Chita, Corse, Cyprus, Czechoslovakia, East Aegean Is., East Himalaya, Egypt, France, Germany, Greece, Gulf States, Hungary, Inner Mongolia, Iran, Iraq, Irkutsk, Italy, Japan, Kazakhstan, Khabarovsk, Kirgizstan, Korea, Krasnoyarsk, Kriti, Krym, Kuril Is., Kuwait, Lebanon-Syria, Lesser Sunda Is., Libya, Madeira, Manchuria, Mauritania, Mongolia, Morocco, Myanmar, Nansei-shoto, Nepal, Netherlands, New Guinea, New South Wales, Niger, North Caucasus, Northern Territory, Oman, Pakistan, Palestine, Philippines, Poland, Portugal, Primorye, Qinghai, Queensland, Romania, Sakhalin, Sardegna, Saudi Arabia, Sicilia, Sinai, South Australia, South European Russi, Spain, Sudan, Sumatera, Switzerland, Tadzhikistan, Taiwan, Tasmania, Thailand, Tibet, Transcaucasus, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Tuva, Ukraine, Uzbekistan, Victoria, Vietnam, West Himalaya, West Siberia, Xinjiang, Yakutskiya, Yugoslavia; Introduced into: Alabama, Alberta, Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Azores, Baltic States, Belarus, Bermuda, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, British Columbia, California, Central European Rus, Chatham Is., Chile Central, Chile North, Colorado, Connecticut, Costa Rica, Delaware, Denmark, District of Columbia, East European Russia, Finland, Florida, Georgia, Great Britain, Idaho, Illinois, Indiana, Iowa, Jawa, Kansas, Kentucky, Louisiana, Maine, Manitoba, Maryland, Massachusetts, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, New Zealand North, New Zealand South, Newfoundland, North Carolina, North Dakota, North European Russi, Northwest European R, Northwest Territorie, Norway, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Panamá, Pennsylvania, Prince Edward I., Québec, Saskatchewan, South Carolina, South Dakota, Sweden, Tennessee, Texas, Uruguay, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, Yukon as per POWO)
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Setaria (Poaceae) page with comparative images:
Pl. go through‎ Setaria (Poaceae) page with comparative images of species in efloraofindia. On clicking the link of species, one can check the complete details.
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.
Thanks a lot, Manoj Chandran ji, for most of the identifications.