1. Family: Poaceae Barnhart
    1. Genus: Oryza L.
      1. Oryza sativa L.

        Rice is the most widely grown tropical cereal, and over 400 million tonnes of milled rice is produced each year. The importance of rice has been recognised for many centuries - in India it was once known as 'dhanya' meaning 'the sustainer of the human race'. Rice is a staple food of South Asia and a vast number of people are employed in its cultivation.

    [KSP]

    Kew Species Profiles

    General Description

    One of the world's most important staple crops and a major part in the diet of more than half the world’s population, rice also has many medicinal uses.

    Rice is the most widely grown tropical cereal, and over 400 million tonnes of milled rice is produced each year. The importance of rice has been recognised for many centuries - in India it was once known as 'dhanya' meaning 'the sustainer of the human race'. Rice is a staple food of South Asia and a vast number of people are employed in its cultivation.

    Not only is rice used in a variety of ways as a foodstuff, but it is also an ingredient in medicines and cosmetics, and has a role in crafts and religious ceremonies.

    Species Profile
    Geography and distribution

    Oryza sativa is cultivated in Europe, Africa, tropical and temperate Asia, Australia, and North and South America.

    Domestication of rice

    The history of rice domestication is not fully understood. Its wild ancestor, Oryza rufipogon , grows throughout south and southeast Asia, and finds of rice at early sites in the region may derive from harvesting of wild grain, rather than cultivation.

    The earliest records of domesticated rice are probably those from the Lower Yangtze river valley of southern China, dating from about 6000 BC. Archaeological and historical evidence suggests that rice spread slower than most crops, in part owing to its specialised need for abundant water. For example, rice did not become an important crop in North America until the late 17th century.

    Description

    Overview: A grass which can grow to over 1 m tall, or to 5 m long in deep water.

    Stem and leaves: The stem is upright and composed of a series of joint-like nodes, with a leaf growing from each node.

    Seeds: The seeds (or grain) grow on branch-like spikes which arch over. The grain is the most economically important part of the rice plant, and its endosperm is the final product consumed.

    There are many cultivar groups of Oryza sativa of which the two most important are O. sativa ‘Indica’ and O. sativa ‘Japonica’.

    O. sativa ‘Indica’ produces long-grain rice and is grown in tropical areas such as southeast Asia and the Philippines, whilst the short-grained O.sativa ‘Japonica’ is cultivated in temperate areas including Japan and northern China. Another species, O. glaberrima , is cultivated on a much smaller scale in Africa.

    ‘Wild rice’ is produced from an entirely different species of grass, Zizania palustris , and is harvested from wild plants in North America.

    Uses

    Food

    After being harvested, rice is de-husked to remove the inedible hull. The resulting grains are usually eaten as white, polished rice from which the bran has been removed. Whole 'brown' rice is mainly popular as a 'health food' in western countries.

    Rice is most often consumed as whole grains, boiled or steamed in water. Rice flour lacks gluten and so is usually consumed as noodles, as the absence of gluten results in poor quality bread.

    Rice cultivars with starch that is low in amylose are waxy or glutinous, and are used industrially as a thickening agent for sauces and puddings, and in eastern Asia for snack foods, such as rice crackers and cakes.

    Traditional medicine

    The main rice-products used as medicines are made from brown rice and rice oil from rice bran. Some of the traditional medicinal uses of rice are supported by scientific studies.

    Rice can be used to treat skin conditions. The rice is boiled, drained, allowed to cool and then mashed. The rice is made into a paste or moulded into balls and these can be applied to boils, sores, swellings and skin blemishes. Other herbs are sometimes added to the rice balls to increase their medicinal effects.

    Sticky glutinous rice is often taken to treat stomach upsets, heart-burn and indigestion. Extracts from brown rice have been used to treat breast and stomach cancer and warts. They have also been used to treat indigestion, nausea and diarrhoea.

    Western medicine

    Laboratory studies have shown that rice products may have anti-cancer properties and the potential to treat other conditions such as diabetes, kidney stones and heart disease.

    The medicinal properties of rice vary depending on the types used. Many of the beneficial compounds present in brown rice are absent from highly-refined white rice. Rice bran can contain up to about 25% fibre, which is known to assist the absorption of fats in the gut. It also decreases levels of cholesterol in the blood, aids digestion and can be used as a mild laxative. The oil from rice bran contains vitamin E and minerals. The vitamin E group of compounds in rice have antioxidant properties, and these compounds could explain some of the traditional medicinal uses of rice, particularly to treat cancer.

    Cosmetics and other uses

    Rice extracts, such as starch and oil, are used in a range of cosmetic and hygiene products. Rice starch can be mixed with honey to nourish the skin and can be used in cosmetics to reduce facial 'shine'. The oil is used in sun-care products to absorb UV-rays, as well as in conditioners for hair-care and in shower and shampoo products. It is also reported to have moisturising and anti-ageing properties. Extracts containing rice protein are added to hair products to give a feeling of volume and thickness to the hair.

    In some parts of the world, the husks and grains of rice are used for bedding, fuels and building board. Rice can be charred as filtration material or for charcoal briquettes. Bran oil is used in cooking, and has anti-corrosive properties. It is also used as a textile and leather finisher. India is one of the main rice bran processors. Rice straw is used for animal feed and bedding, and can be made into paper and board pulp. It is also used in horticulture as a mushroom growing medium, organic manure and a mulch. More rarely it has been used for rope and thatch.

    Millennium Seed Bank: Seed storage

    The Millennium Seed Bank Partnership aims to save plant life worldwide, focusing on plants under threat and those of most use in the future. Seeds are dried, packaged and stored at a sub-zero temperature in our seed bank vault.

    Four collections of Oryza sativa seeds are held in Kew’s Millennium Seed Bank based at Wakehurst in West Sussex.

    Cultivation

    To grow rice from seed at Kew, the seed is collected in August when it is brown and dry. It is then cleaned, with the husk retained, and used within one year. It has been observed that the rate of seed germination drops rapidly as the seed ages. In the Tropical Nursery at Kew, the seed is sown onto a mix of loam, coir and Silvafibre and covered with vermiculite. The seed can be sown quite thickly. After this, the pot is placed in a water-bath at 22°C. The application of bottom heat at 24°C speeds up germination. Germination then takes about a week, after which the plants can be thinned out if necessary.

    Fleece should be placed over the seedlings if it is known that spider mites are present in the glasshouse, as young seedlings are particularly prone to attack by them. The young plants can be fast-growing and benefit from large amounts of fertiliser. Chicken manure pellets can be pushed into the compost or broken up into the water-bath.

    About three weeks to a month after germination, the young plants are planted into their final large display pots in loam. The pots are placed in water that is 10–25 cm deep, and the water is kept at 22°C.

    Cultivation around the world

    Different methods of rice cultivation have evolved in different regions according to their climate and geography. In dry or upland cultivation, rice is grown on hillsides as a rain-fed crop, similar to other cereals. Dry cultivation is mainly important in South America and Africa. In wet or lowland systems, most important in Asia, rice is grown on irrigated or flooded paddies. The seeds are often sown in a nursery and then transplanted into paddies. Deep-water rice is grown in water 50 cm or more deep, and is important in Bangladesh and other areas with deeply flooded river valleys. The rice plant has fast-growing stems that grow in pace with the rising water, up to a maximum of 4 m. Much of the nutrition for deep-water rice is provided by the silt deposits borne by the flood water.

    This species at Kew

    Oryza sativa can be seen growing in Kew's Waterlily House, where it is usually on display for most of the summer.

    Pressed and dried specimens of rice are held in Kew's Herbarium, where they are available to researchers by appointment. Details, including images, of some of these specimens can be seen online in Kew's Herbarium Catalogue.

    There are over one hundred specimens of O. sativa in Kew's Economic Botany Collection, including paper, brushes, starch, flour, seed, toasted rice and medicines produced from rice.

    Ecology
    Commonly in river valleys and other areas where water is abundant, but also cultivated in some dryland areas.
    Conservation
    Widespread in cultivation.
    Hazards

    Rice can accumulate arsenic if this is present in high levels in irrigation water.

    [GB]
    Habit
    Annual. Culms erect, or geniculately ascending; 45-180 cm long; 3-20 -noded. Leaf-sheaths smooth; glabrous on surface. Leaf-sheath auricles erect. Ligule an eciliate membrane; 15-30 mm long; entire, or lacerate; acute. Leaf-blades 12-65 cm long; 4-18 mm wide. Leaf-blade surface scaberulous; rough adaxially; glabrous, or pubescent. Leaf-blade margins scabrous. Leaf-blade apex acute.
    Inflorescences
    Inflorescence a panicle. Panicle open; lanceolate; equilateral, or nodding; 20-50 cm long. Primary panicle branches appressed, or ascending, or spreading. Panicle branches angular; scaberulous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear; angular; 2-4 mm long; scaberulous; tip cupuliform; bibracteate.
    Spikelets
    Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or oblong; laterally compressed; 8-11 mm long; 2.5-3.5 mm wide; persistent on plant. Spikelet callus glabrous; base truncate; attached obliquely.
    Fertile
    Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or oblong; laterally compressed; 8-11 mm long; 2.5-3.5 mm wide; persistent on plant. Spikelet callus glabrous; base truncate; attached obliquely.
    Glume
    Glumes both absent or obscure.
    Florets
    Basal sterile florets similar; barren; without significant palea. Lemma of lower sterile floret lanceolate; 2-3 mm long; 0.25(-0.5) length of spikelet; membranous; without lateral veins; emarginate. Lemma of upper sterile floret lanceolate; 2-3 mm long; 1 length of lower sterile floret; membranous. Fertile lemma elliptic; laterally compressed; 8-11 mm long; coriaceous; keeled; 5 -veined. Lemma midvein ciliate; hairy above. Lemma surface reticulate; glabrous, or hispid. Lemma margins involute. Lemma apex rostrate; muticous, or awned; 1 -awned. Principal lemma awn 0-160 mm long overall; limb scabrous. Palea elliptic; 1 length of lemma; coriaceous; 3 -veined; 1-keeled. Palea keels scabrous. Palea apex acute.
    Flowers
    Lodicules 2; lanceolate; membranous. Anthers 6. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp. Disseminule comprising a floret.
    Distribution
    Europe: central, southwestern, southeastern, and eastern. Africa: north, Macaronesia, west tropical, west-central tropical, northeast tropical, east tropical, southern tropical, south, and western Indian ocean. Asia-temperate: Soviet far east, Soviet Middle Asia, Caucasus, western Asia, Arabia, China, Mongolia, and eastern Asia. Asia-tropical: India, Indo-China, Malesia, and Papuasia. Australasia: Australia. Pacific: southwestern, northwestern, and north-central. North America: southwest USA, south-central USA, southeast USA, and Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, Brazil, and southern South America.
    Reference
    Oryzeae. FZ.
    [FZ]

    Gramineae, E. Launert. Flora Zambesiaca 10:1. 1971

    Habit
    An annual or rarely short-lived perennial of variable habit.
    Culms
    Culms 45-180 cm. tall, 3-many-noded (up to 20), 6-8 mm. in diam., erect or ascending from a geniculate base, terete, hollow, smooth, glabrous.
    Leaf sheaths
    Leaf-sheath coarsely striate, tight when young, later somewhat loose, often somewhat spongy, green or sometimes tinged with brown or purple, smooth, glabrous; the lowest usually longer, the upper shorter than the internodes.
    Ligules
    Ligule (1·25)1·5-3 cm. long, triangular, acute, entire or split, usually glabrous, sometimes tinged with pink, purple or brown in some varieties or strains.
    Leaf lamina
    Leaf-laminae 12-65 x 0·4 — 1·75 cm., linear, tapering to an acute point, bright green to glaucous, rather flaccid, glabrous or puberulous, rarely scattered with short hairs, smooth on the lower, asperulous on the upper surface; midrib usually distinct.
    Inflorescences
    Panicle up to 50 cm. long, erect, curved or drooping, very variable in density; rhachis obtusely angular, smooth, glabrous or scattered hairy; branches solitary or clustered, forming a variable angle with the rhachis (from being nearly erect to spreading), angular, scabrous.
    Pedicel
    Pedicels up to 4 mm. long, stout, scabrous.
    Spikelets
    Spikelets 8-11 x 2·5-3·5 mm., not deciduous (the articulation to the pedicel is usually completely solidified but there are, however, some strains in which the spikelets fall off at maturity), obliquely attached to the pedicel, very variable in shape, asymmetrically oblong to elliptic-oblong in lateral view.
    Glume
    Glumes (the narrow rim at the base of the spikelet) varying in colour from pale white to yellow, purple or black.
    Lemma
    Sterile lemmas about equal in shape and size, usually 2-3 mm. long (very rarely up to 1/2 the length of the spikelet in certain forms “winged varieties”), lanceolate, acute, glossy. Fertile lemma as described for O. barthii, sometimes coloured, usually awnless, sometimes awned (the awn often purple-pink, more rarely colourless).
    Sterile
    Sterile lemmas about equal in shape and size, usually 2-3 mm. long (very rarely up to 1/2 the length of the spikelet in certain forms “winged varieties”), lanceolate, acute, glossy.
    Fertile
    Fertile lemma as described for O. barthii, sometimes coloured, usually awnless, sometimes awned (the awn often purple-pink, more rarely colourless).
    Palea
    Paleas as described for O. barthii.
    Note
    Sexual organs and caryopsis similar to those of O. barthii.
    [FWTA]

    Gramineae, W. D. Clayton. Flora of West Tropical Africa 3:2. 1972

    Note
    Widely cultivated on river flood-plains in W. Africa, and in a few localities grown as an upland crop.
    [KSP]
    Use
    Food, medicine, cosmetics, crafts.

    Images

    Distribution

    Found In:

    China North-Central, China South-Central, China Southeast

    Introduced Into:

    Afghanistan, Alabama, Albania, Algeria, Andaman Is., Arkansas, Assam, Bangladesh, Belize, Benin, Bolivia, Borneo, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Bulgaria, Burkina, Burundi, California, Cambodia, Cameroon, Central African Repu, Chad, Chile Central, Colombia, Comoros, Costa Rica, Cuba, Cyprus, Czechoslovakia, Dominican Republic, East Himalaya, Ecuador, Egypt, El Salvador, Equatorial Guinea, France, Gambia, Georgia, Greece, Guatemala, Guinea, Guinea-Bissau, Gulf of Guinea Is., Hainan, Haiti, Honduras, Hungary, Illinois, India, Inner Mongolia, Iran, Iraq, Italy, Ivory Coast, Jamaica, Japan, Jawa, Kazakhstan, Khabarovsk, Korea, Krym, Laos, Leeward Is., Lesser Sunda Is., Louisiana, Madagascar, Malaya, Mali, Manchuria, Mauritania, Mauritius, Mexico Gulf, Mexico Southeast, Mexico Southwest, Mississippi, Missouri, Morocco, Mozambique, Myanmar, Nansei-shoto, Nepal, New Guinea, New South Wales, Nicaragua, Nicobar Is., Niger, North Carolina, Northern Territory, Oklahoma, Pakistan, Palestine, Panamá, Peru, Philippines, Portugal, Primorye, Puerto Rico, Qinghai, Queensland, Romania, Rwanda, Santa Cruz Is., Saudi Arabia, Senegal, Seychelles, South Carolina, South European Russi, Spain, Sri Lanka, Sumatera, Tadzhikistan, Taiwan, Tennessee, Texas, Thailand, Togo, Trinidad-Tobago, Turkey, Turkey-in-Europe, Turkmenistan, Ukraine, Uzbekistan, Venezuela, Vietnam, Virginia, West Himalaya, Western Australia, Windward Is., Xinjiang, Yemen, Yugoslavia

    Common Names

    English
    Rice

    Oryza sativa L. appears in other Kew resources:

    Date Identified Reference Herbarium Specimen Type Status
    Jan 1, 2014 Glaziou, A. [22402], Brazil K001055142
    Jan 1, 2014 Addison, G.O.N. [s.n.], Brazil K001055146
    Jan 1, 2014 Burchell [3626], Brazil K001055150
    May 1, 1998 Nascimento, M.S.B. [1237], Brazil K001055140
    Jan 1, 1986 Balée, W.L. [915], Brazil K001055139
    Carauta, J.P.P. [815], Brazil K001055136
    Philcox, D. [3688], Brazil K001055137
    Philcox, D. [3913], Brazil K001055138
    s.coll. [Cat. no. 8632] K001131029
    s.coll. [Cat. no. 8632] K001131030
    Black, G.A. [50-9743], Brazil K001055141
    s.coll. [Cat. no. 8632] K001131031
    Gerard, P. [Cat. no. 8632], India K001131032
    Butler, T. [s.n.] K001055143
    s.coll. [Cat. no. 8632] K001131033
    Black, G.A. [50-9741a], Brazil K001055144
    s.coll. [Cat. no. 8632] K001131034
    Black, G.A. [50-9741a], Brazil K001055145
    s.coll. [Cat. no. 8632] K001131035
    Wallich, N. [Cat. no. 8632], Myanmar K001131036
    Glaziou, A. [8700], Brazil K001055147
    De Silva, F. [Cat. no. 8632] K001131037
    Strang, H. [910], Brazil K001055148
    s.coll. [Cat. no. 8632] K001131038
    Clayton, W.D. [4704], Brazil K001055149
    Traill, J.W.H. [1210], Brazil K001055151
    Riedel [74], Brazil K001055152
    Sharma, S.D. [152], Madhya Pradesh K000032067
    Kerr, A.F.G. [3419], Thailand K000631573
    Kerr, A.F.G. [3420], Thailand K000631574
    Kerr, A.F.G. [3421], Thailand K000631575
    Kerr, A.F.G. [3422], Thailand K000631576
    Niyomdham, C. [1281], Thailand K000682192
    Kerr, A.F.G. [3454], Thailand K000631577
    Niyomdham, C. [1795], Thailand K000682193
    Kerr, A.F.G. [3456], Thailand K000631578
    Niyomdham, C. [1795], Thailand K000682194
    Kerr, A.F.G. [3457], Thailand K000631579
    Niyomdham, C. [1795], Thailand K000682195
    Kerr, A.F.G. [3460], Thailand K000631580
    Lazarides, M. [7460], Thailand K000682196
    Put [1979], Thailand K000631581
    Chantaranothai [90/675], Thailand K000682197
    Put [1979], Thailand K000631582

    First published in Sp. Pl.: 333 (1753)

    Accepted in:

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    • [10] (2009) Indian Journal of Forestry 32: 657-668
    • [11] (2009) Scripta Botanica Belgica 41: 1-517
    • [12] (2008) Encyclopedia of Flora and Fauna of Bangladesh 12: 1-505. Asiatic Society of Bangladesh
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    Flora of West Tropical Africa
    [A] http://creativecommons.org/licenses/by-nc-sa/3.0

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

    GrassBase - The Online World Grass Flora
    [C] http://creativecommons.org/licenses/by-nc-sa/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families (2017). Published on the internet at http://www.ipni.org and http://apps.kew.org/wcsp
    [D] See http://kew.org/about-kew/website-information/legal-notices/index.htm You may use data on these Terms and Conditions and on further condition that: The data is not used for commercial purposes; You may copy and retain data solely for scholarly, educational or research purposes; You may not publish our data, except for small extracts provided for illustrative purposes and duly acknowledged; You acknowledge the source of the data by the words "With the permission of the Trustees of the Royal Botanic Gardens, Kew" in a position which is reasonably prominent in view of your use of the data; Any other use of data or any other content from this website may only be made with our prior written agreement. http://creativecommons.org/licenses/by-nc-sa/3.0
    [E] © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Species Profiles
    Kew Species Profiles
    [F]
    [G] http://creativecommons.org/licenses/by-nc-sa/3.0

    Kew Library Art and Archives
    [H] Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/