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Rambutan (; taxonomic name: ''Nephelium lappaceum'') is a medium-sized tropical tree in the family Sapindaceae. The name also refers to the edible fruit produced by this tree. The rambutan is native to Southeast Asia. It is closely related to several other edible
tropical fruits A tropical fruit one that typically grows in warm climates, or equatorial areas. Tropical fruits Varieties of tropical fruit include: *Acerola ( West Indian Cherry or Barbados Cherry) *Ackee *Banana *Barbadine (granadilla; maracujá-açu in ...
including the
lychee Lychee (US: ; UK: ; ''Litchi chinensis''; ) is a monotypic taxon and the sole member in the genus ''Litchi'' in the soapberry family, ''Sapindaceae''. It is a tropical tree native to Southeast and Southwest China (the Guangdong, Fujian, Yun ...
,
longan ''Dimocarpus longan'', commonly known as the longan () and dragon's eye, is a tropical tree species that produces edible fruit. It is one of the better-known tropical members of the soapberry family Sapindaceae, to which the lychee and rambu ...
,
pulasan ''Nephelium ramboutan-ake'', the pulasan, is a tropical fruit in the soapberry family Sapindaceae. It is closely related to the rambutan and sometimes confused with it. Other related soapberry family fruits include lychee and longan. Usually ...
and
guinep ''Melicoccus bijugatus'' is a fruit-bearing tree in the soapberry family Sapindaceae, native or naturalized across the New World tropics including South and Central America, and parts of the Caribbean. Its stone-bearing fruits are edible. It is ...
.


Etymology

The name "rambutan" is derived from the
Malay Malay may refer to: Languages * Malay language or Bahasa Melayu, a major Austronesian language spoken in Indonesia, Malaysia, Brunei and Singapore ** History of the Malay language, the Malay language from the 4th to the 14th century ** Indonesi ...
word ''rambut'' meaning 'hair' referring to the numerous hairy protuberances of the fruits, together with the noun-building suffix ''-an''. Similarly, in
Vietnam Vietnam or Viet Nam ( vi, Việt Nam, ), officially the Socialist Republic of Vietnam,., group="n" is a country in Southeast Asia, at the eastern edge of mainland Southeast Asia, with an area of and population of 96 million, making i ...
, they are called ''chôm chôm'' (meaning 'messy hair').


Origin and distribution

The center of genetic diversity for rambutans is the
Malaysia Malaysia ( ; ) is a country in Southeast Asia. The federation, federal constitutional monarchy consists of States and federal territories of Malaysia, thirteen states and three federal territories, separated by the South China Sea into two r ...
n−
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...
n region. They have been widely cultivated in
southeast Asia Southeast Asia, also spelled South East Asia and South-East Asia, and also known as Southeastern Asia, South-eastern Asia or SEA, is the geographical United Nations geoscheme for Asia#South-eastern Asia, south-eastern region of Asia, consistin ...
areas, such as
Malaysia Malaysia ( ; ) is a country in Southeast Asia. The federation, federal constitutional monarchy consists of States and federal territories of Malaysia, thirteen states and three federal territories, separated by the South China Sea into two r ...
,
Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is bo ...
,
Myanmar Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John C. Wells, Joh ...
,
Sri Lanka Sri Lanka (, ; si, ශ්‍රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...
,
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...
,
Singapore Singapore (), officially the Republic of Singapore, is a sovereign island country and city-state in maritime Southeast Asia. It lies about one degree of latitude () north of the equator, off the southern tip of the Malay Peninsula, borde ...
, and
the Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...
. It has spread from there to parts of Asia, Africa, Oceania and Central America. Around the 13th to 15th centuries, Arab traders, who played a major role in
Indian Ocean trade Indian Ocean trade has been a key factor in East–West exchanges throughout history. Long-distance trade in dhows and proas made it a dynamic zone of interaction between peoples, cultures, and civilizations stretching from Southeast Asia to Eas ...
, introduced rambutans to
Zanzibar Zanzibar (; ; ) is an insular semi-autonomous province which united with Tanganyika in 1964 to form the United Republic of Tanzania. It is an archipelago in the Indian Ocean, off the coast of the mainland, and consists of many small islands ...
and
Pemba Pemba may refer to: __NOTOC__ Places * Pemba Island, in Tanzania * Pemba, Mozambique, the capital of Cabo Delgado Province * Pemba, Zambia, a small town Individuals * George Pemba, South African painter * Pemba (panda), a red panda * Tsewang Yishe ...
of
East Africa East Africa, Eastern Africa, or East of Africa, is the eastern subregion of the African continent. In the United Nations Statistics Division scheme of geographic regions, 10-11-(16*) territories make up Eastern Africa: Due to the historical ...
. There are limited rambutan plantings in some parts of India. In the 19th century, the Dutch introduced rambutans from their colony in Southeast Asia to
Suriname Suriname (; srn, Sranankondre or ), officially the Republic of Suriname ( nl, Republiek Suriname , srn, Ripolik fu Sranan), is a country on the northeastern Atlantic coast of South America. It is bordered by the Atlantic Ocean to the north ...
in South America. Subsequently, the plants spread to tropical Americas, planted in the coastal lowlands of Colombia, Ecuador, Honduras, Costa Rica, Trinidad and Cuba. In 1912, rambutans were introduced to the Philippines from Indonesia. Further introductions were made in 1920 (from Indonesia) and 1930 (from Malaya), but until the 1950s its distribution was limited. There was an attempt to introduce rambutans to the Southeastern United States, with seeds imported from
Java Java (; id, Jawa, ; jv, ꦗꦮ; su, ) is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 151.6 million people, Java is the world's List ...
in 1906, but the species proved to be unsuccessful, except in
Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and Unincorporated ...
.


Description

It is an
evergreen In botany, an evergreen is a plant which has foliage that remains green and functional through more than one growing season. This also pertains to plants that retain their foliage only in warm climates, and contrasts with deciduous plants, which ...
tree growing to a height of . The leaves are alternate, 14–30 cm long,
pinnate Pinnation (also called pennation) is the arrangement of feather-like or multi-divided features arising from both sides of a common axis. Pinnation occurs in biological morphology, in crystals, such as some forms of ice or metal crystals, and in ...
, with three to 11 leaflets, each leaflet 5–15 cm wide and 3–10 cm broad, with an entire margin. The flowers are small, 2.5–5 mm,
apetalous Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators. All of the petals of a flower are collectively known as the ''corolla''. Petals are usually ...
,
discoidal In embryology, cleavage is the division of cells in the early development of the embryo, following fertilization. The zygotes of many species undergo rapid cell cycles with no significant overall growth, producing a cluster of cells the same size ...
and borne in erect terminal
panicle A panicle is a much-branched inflorescence. (softcover ). Some authors distinguish it from a compound spike inflorescence, by requiring that the flowers (and fruit) be pedicellate (having a single stem per flower). The branches of a panicle are of ...
s 15–30 cm wide. Rambutan trees can be male (producing only
staminate The stamen (plural ''stamina'' or ''stamens'') is the pollen-producing reproductive organ of a flower. Collectively the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filam ...
flowers and, hence, produce no fruit), female (producing flowers that are only functionally female) or
hermaphroditic In reproductive biology, a hermaphrodite () is an organism that has both kinds of reproductive organs and can produce both gametes associated with male and female sexes. Many taxonomic groups of animals (mostly invertebrates) do not have separ ...
(producing flowers that are female with a small percentage of male flowers).


Fruit

The fruit is a round to oval single-seeded
drupe In botany, a drupe (or stone fruit) is an indehiscent fruit in which an outer fleshy part (exocarp, or skin, and mesocarp, or flesh) surrounds a single shell (the ''pit'', ''stone'', or '' pyrena'') of hardened endocarp with a seed (''kernel'') ...
, 3–6 cm (rarely to 8 cm) long and 3–4 cm broad, borne in a loose pendant cluster of 10–20 together. The leathery skin is reddish (rarely orange or yellow) and covered with fleshy pliable spines, hence the name, which means 'hairs'. The spines (also known as "spinterns") contribute to the
transpiration Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants but only a small amount of water taken up by the roots is used for growth a ...
of the fruit, which can affect the fruit's quality. The fruit flesh, the
aril An aril (pronounced ), also called an arillus, is a specialized outgrowth from a seed that partly or completely covers the seed. An arillode or false aril is sometimes distinguished: whereas an aril grows from the attachment point of the see ...
, is translucent, whitish or very pale pink, with a sweet, mildly acidic flavor reminiscent of
grapes A grape is a fruit, botanically a berry, of the deciduous woody vines of the flowering plant genus ''Vitis''. Grapes are a non- climacteric type of fruit, generally occurring in clusters. The cultivation of grapes began perhaps 8,000 years ago ...
. The single seed is glossy brown, 1–1.3 cm, with a white basal scar. Soft and containing equal portions of
saturated Saturation, saturated, unsaturation or unsaturated may refer to: Chemistry * Saturation, a property of organic compounds referring to carbon-carbon bonds ** Saturated and unsaturated compounds **Degree of unsaturation ** Saturated fat or fatty ac ...
and
unsaturated fats In nutrition, biology, and chemistry, fat usually means any ester of fatty acids, or a mixture of such compounds, most commonly those that occur in living beings or in food. The term often refers specifically to triglycerides (triple est ...
, the seed may be cooked and eaten, but is bitter and has
narcotic The term narcotic (, from ancient Greek ναρκῶ ''narkō'', "to make numb") originally referred medically to any psychoactive compound with numbing or paralyzing properties. In the United States, it has since become associated with opiates ...
properties.


Pollination

Aromatic rambutan flowers are highly attractive to many insects, especially bees. Flies (Diptera), bees (
Hymenoptera Hymenoptera is a large order (biology), order of insects, comprising the sawfly, sawflies, wasps, bees, and ants. Over 150,000 living species of Hymenoptera have been described, in addition to over 2,000 extinct ones. Many of the species are Par ...
) and ants ('' Solenopsis'') are the main pollinators. Among the Diptera, '' Lucilia'' spp. are abundant and among the Hymenoptera,
honey bee A honey bee (also spelled honeybee) is a eusocial flying insect within the genus ''Apis'' of the bee clade, all native to Afro-Eurasia. After bees spread naturally throughout Africa and Eurasia, humans became responsible for the current co ...
s (''
Apis dorsata ''Apis dorsata'', the giant honey bee, सिङ्गुस in Nepali, is a honey bee of South and Southeast Asia, found mainly in forested areas such as the Terai of Nepal. They are typically around long. Nests are mainly built in exposed pla ...
'' and '' A. cerana'') and the
stingless bee Stingless bees, sometimes called stingless honey bees or simply meliponines, are a large group of bees (about 550 described species), comprising the tribe Meliponini (or subtribe Meliponina according to other authors). They belong in the family A ...
genus ''
Trigona ''Trigona'' is one of the largest genera of stingless bees, comprising about 32 species, exclusively occurring in the New World, and formerly including many more subgenera than the present assemblage; many of these former subgenera have been el ...
'' are the major visitors. ''A. cerana'' colonies foraging on rambutan flowers produce large quantities of
honey Honey is a sweet and viscous substance made by several bees, the best-known of which are honey bees. Honey is made and stored to nourish bee colonies. Bees produce honey by gathering and then refining the sugary secretions of plants (primar ...
. Bees foraging for nectar routinely contact the stigma of female flowers and gather significant quantities of the sticky pollen from male blossoms. Little pollen has been seen on bees foraging female flowers. Although male flowers open at 06:00, foraging by ''A. cerana'' is most intense between 07:00 and 11:00, tapering off rather abruptly thereafter. In Thailand, ''A. cerana'' is the preferred species for small-scale pollination of rambutan. Its hair is also helpful in pollination where pollen can be hooked on and transported to female flowers.


Production

Rambutan is a fruit tree cultivated in humid tropical Southeast Asia. It is a common garden fruit tree and propagated commercially in small
orchard An orchard is an intentional plantation of trees or shrubs that is maintained for food production. Orchards comprise fruit- or nut-producing trees which are generally grown for commercial production. Orchards are also sometimes a feature of larg ...
s. It is one of the best-known fruits of Southeast Asia and is also widely cultivated elsewhere in the tropics including Africa, southern Mexico, the Caribbean islands, Costa Rica, Honduras, Panama, India, Vietnam, Philippines, and Sri Lanka. It is also produced in Ecuador where it is known as ''achotillo,'' and on the island of
Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and Unincorporated ...
. , Thailand was the largest producer of rambutans ( th, เงาะ, ), growing 450,000
tonne The tonne ( or ; symbol: t) is a unit of mass equal to 1000  kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton to distinguish it from the non-metric units of the short ton ( United State ...
s, followed by Indonesia at 100,000 tonnes, and Malaysia, 60,000 tonnes. In Thailand, major cultivation centers are Chanthaburi Province, followed by Chumphon Province and Surat Thani Province. In Indonesia, the production center of rambutan is in the western parts of Indonesia, which includes
Java Java (; id, Jawa, ; jv, ꦗꦮ; su, ) is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 151.6 million people, Java is the world's List ...
,
Sumatra Sumatra is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 473,481 km2 (182,812 mi.2), not including adjacent i ...
, and
Kalimantan Kalimantan () is the Indonesian portion of the island of Borneo. It constitutes 73% of the island's area. The non-Indonesian parts of Borneo are Brunei and East Malaysia. In Indonesia, "Kalimantan" refers to the whole island of Borneo. In 2019, ...
. In Java, the orchards and ''pekarangan'' (habitation yards) in the villages of
Greater Jakarta The Jakarta metropolitan area or Greater Jakarta, known locally as Jabodetabek (an acronym of Jakarta–Bogor–Depok–Tangerang–Bekasi), and sometimes extended to Jabodetabekjur (with the acronym extended to include part of Cianjur Regency) ...
and
West Java West Java ( id, Jawa Barat, su, ᮏᮝ ᮊᮥᮜᮧᮔ᮪, romanized ''Jawa Kulon'') is a province of Indonesia on the western part of the island of Java, with its provincial capital in Bandung. West Java is bordered by the province of Banten ...
have been known as rambutan production centers since colonial era, with a trading center in
Pasar Minggu Pasar Minggu is a district of South Jakarta, Jakarta, Indonesia. The area is known for its traditional Sunday market, famous for the fruit market. Historically, Pasar Minggu is a fruit cultivation area developed by the Dutch government during the ...
, South Jakarta. During 2017 and years before, imports of rambutan to the
European Union The European Union (EU) is a supranational political and economic union of member states that are located primarily in Europe. The union has a total area of and an estimated total population of about 447million. The EU has often been des ...
were about 1,000
tonne The tonne ( or ; symbol: t) is a unit of mass equal to 1000  kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton to distinguish it from the non-metric units of the short ton ( United State ...
s annually, enabling a year-round supply from numerous tropical suppliers. The fruits are usually sold fresh and have a short shelf-life, and are commonly used in making jams and jellies, or canned. Evergreen rambutan trees with their abundant colored fruit make attractive landscape specimens. In India, rambutan is imported from Thailand, as well as grown in
Pathanamthitta District Pathanamthitta District (), is one of the 14 districts in the Indian state of Kerala. The district headquarters is in the town of Pathanamthitta. There are four municipalities in Pathanamthitta: Adoor, Pandalam, Pathanamthitta and Thiruval ...
of the southern state of
Kerala Kerala ( ; ) is a state on the Malabar Coast of India. It was formed on 1 November 1956, following the passage of the States Reorganisation Act, by combining Malayalam-speaking regions of the erstwhile regions of Cochin, Malabar, South ...
. Rambutans are not a climacteric fruit — that is, they ripen only on the tree and appear not to produce a ripening agent, such as the
plant hormone Plant hormone (or phytohormones) are signal molecules, produced within plants, that occur in extremely low concentrations. Plant hormones control all aspects of plant growth and development, from embryogenesis, the regulation of organ size, pa ...
ethylene Ethylene (IUPAC name: ethene) is a hydrocarbon which has the formula or . It is a colourless, flammable gas with a faint "sweet and musky" odour when pure. It is the simplest alkene (a hydrocarbon with carbon-carbon double bonds). Ethylene i ...
, after being harvested. However, at post-harvest, the quality of the fruit is affected by storage factors. Low humidity levels, storage time, and incidences of mechanical damage can severely affect the quality of the fruit which would negatively affect the demand for such. In general, the fruit has a short shelf life in ambient conditions but implementing methods that can extend such is a productional advantage. Certain treatments like irradiation and the use of hot-forced air can help in fruit preservation although the former has seen more success.


Cultivation

Rambutans are adapted to warm tropical climates, around 22–30 °C, and are sensitive to temperatures below 10 °C. It is grown commercially within 12–15° of the equator. The trees grows well at elevations up to above sea level, and does best in deep soil, clay loam or sandy loam rich in organic matter. They grow on hilly terrain where there is good drainage. Rambutans are propagated by
grafting Grafting or graftage is a horticultural technique whereby tissues of plants are joined so as to continue their growth together. The upper part of the combined plant is called the scion () while the lower part is called the rootstock. The succ ...
,
air-layering Layering has evolved as a common means of vegetative propagation of numerous species in natural environments. Layering is also utilized by horticulturists to propagate desirable plants. Natural layering typically occurs when a branch touches ...
, and
budding Budding or blastogenesis is a type of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division at one particular site. For example, the small bulb-like projection coming out from the yeast cell is know ...
. Budded trees may fruit after two to three years with optimum production occurring after eight to 10 years. Trees grown from seed bear after five to six years. The aril is attached to the seed in some commercial cultivars, but "freestone"
cultivar A cultivar is a type of cultivated plant that people have selected for desired traits and when propagated retain those traits. Methods used to propagate cultivars include: division, root and stem cuttings, offsets, grafting, tissue culture, ...
s are available and in high demand. Usually, a single light brown seed is found, which is high in certain fats and oils (primarily
oleic acid Oleic acid is a fatty acid that occurs naturally in various animal and vegetable fats and oils. It is an odorless, colorless oil, although commercial samples may be yellowish. In chemical terms, oleic acid is classified as a monounsaturated omega ...
and
arachidic acid Arachidic acid, also known as icosanoic acid, is a saturated fatty acid with a 20-carbon chain. It is a minor constituent of cupuaçu butter (7%), perilla oil (0–1%), peanut oil (1.1–1.7%), corn oil (3%),U.S. Department of Agriculture, Agricul ...
) valuable to industry, and used in cooking and the manufacture of
soap Soap is a salt of a fatty acid used in a variety of cleansing and lubricating products. In a domestic setting, soaps are surfactants usually used for washing, bathing, and other types of housekeeping. In industrial settings, soaps are use ...
. Rambutan roots, bark, and leaves have various uses in
traditional medicine Traditional medicine (also known as indigenous medicine or folk medicine) comprises medical aspects of traditional knowledge that developed over generations within the folk beliefs of various societies, including indigenous peoples, before the ...
and in the production of dyes. In some areas, rambutan trees can bear fruit twice annually, once in late fall and early winter, with a shorter season in late spring and early summer. Other areas, such as Costa Rica, have a single fruit season, with the start of the rainy season in April stimulating flowering, and the fruit is usually ripe in August and September. The fragile fruit must ripen on the tree, then they are harvested over a four- to seven-week period. The fresh fruit are easily bruised and have a limited shelf life. An average tree may produce 5,000–6,000 or more fruit (60–70 kg or 130–155 lb per tree). Yields begin at 1.2 tonnes per hectare (0.5 tons/acre) in young orchards and may reach 20 tonnes per hectare (8 tons per acre) on mature trees. In
Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ...
, 24 of 38 cultivated hectares (60 of 95 acres) were harvested producing 120 tonnes of fruit in 1997. Yields could be increased by improved orchard management, including pollination, and by planting high-yielding compact cultivars. Most commercial cultivars are hermaphroditic; cultivars that produce only functionally female flowers require the presence of male trees. Male trees are seldom found, as vegetative selection has favored hermaphroditic clones that produce a high proportion of functionally female flowers and a much lower number of flowers that produce
pollen Pollen is a powdery substance produced by seed plants. It consists of pollen grains (highly reduced microgametophytes), which produce male gametes (sperm cells). Pollen grains have a hard coat made of sporopollenin that protects the gametophyt ...
. Over 3,000 greenish-white flowers occur in male panicles, each with five to seven anthers and a nonfunctional ovary. Male flowers have yellow nectaries and five to seven stamens. About 500 greenish-yellow flowers occur in each hermaphroditic panicle. Each flower has six anthers, usually a bilobed stigma, and one ovule in each of its two sections (
locule A locule (plural locules) or loculus (plural loculi) (meaning "little place" in Latin) is a small cavity or compartment within an organ or part of an organism (animal, plant, or fungus). In angiosperms (flowering plants), the term ''locule'' usu ...
s). The flowers are receptive for about one day, but may persist if pollinators are excluded. In Thailand, rambutan trees were first planted in
Surat Thani Surat Thani ( th, สุราษฎร์ธานี, ) is a city in Amphoe Mueang Surat Thani, Surat Thani Province, southern Thailand. It lies south of Bangkok. It is the capital of Surat Thani Province. The city has a population of 1 ...
in 1926 by the Chinese Malay K. Vong in
Ban Na San Ban, or BAN, may refer to: Law * Ban (law), a decree that prohibits something, sometimes a form of censorship, being denied from entering or using the place/item ** Imperial ban (''Reichsacht''), a form of outlawry in the medieval Holy Roman ...
. An annual rambutan fair is held during August harvest time. In Malaysia, rambutan flowers from March to July and again between June and November, usually in response to rain following a dry period. Flowering periods differ for other localities. Most, but not all, flowers open early in the day. Up to 100 flowers in each female panicle may be open each day during peak bloom. Initial fruit set may approach 25 percent, but a high abortion level contributes to a much lower level of production at harvest (1 to 3 percent). The fruit matures 15–18 weeks after flowering. Rambutan cultivation in Sri Lanka mainly consists of small home gardens.
Malwana Malwana ( si, මල්වාන ta, மல்வான) is a town of 36,050 (estimate as of 2011) inhabitants in the Western Province of Sri Lanka. It is situated on the banks of the Kelani River, 14 km north-east of Colombo. It is part of ...
, a village in the
Kelani River The Kelani River ( si, කැළණි ගඟ) is a river in Sri Lanka. Ranking as the fourth-longest river in the country, it stretches from the Sri Pada Mountain Range to Colombo. It flows through or borders the Sri Lankan districts of Nuwara ...
Valley, is popular for its rambutan orchards. Their production comes to market in May, June, and July, when it is very common to observe seasonal traders along the streets of
Colombo Colombo ( ; si, කොළඹ, translit=Koḷam̆ba, ; ta, கொழும்பு, translit=Koḻumpu, ) is the executive and judicial capital and largest city of Sri Lanka by population. According to the Brookings Institution, Colombo me ...
. Sri Lanka also has some off-season rambutan production in January and February in areas such as
Bibile Bibile (also spelled:Bibila) is a town located in Monaragala District, Uva Province of Sri Lanka. Bibile's land is important to Sri Lankan agriculture. It was well known for oranges An orange is a fruit of various citrus species in the fa ...
,
Medagama Medagama ( si, මැදගම) is a village, located within the Uva Province, Sri Lanka, Uva Province, Sri Lanka. It is situated in the middle of a mountain range, hence the origin of its name: 'Meda' means middle and 'Gama' is village. Soci ...
, and
Monaragala Monaragala ( si, මොනරාගල, translit=Monarāgala; ta, மொணராகலை, translit=Moṇarākalai) is a town located in Monaragala District, Uva Province, Sri Lanka. It is the largest town in Monaragala District and is located ...
. Both male and female flowers are faintly sweet-scented and have functional nectaries at the ovary base. Female flowers produce two to three times more
nectar Nectar is a sugar-rich liquid produced by plants in glands called nectaries or nectarines, either within the flowers with which it attracts pollinating animals, or by extrafloral nectaries, which provide a nutrient source to animal mutualists ...
than male flowers. Nectar sugar concentration ranges between 18–47 percent and is similar between the flower types. Rambutans are an important
nectar source A nectar source is a flowering plant that produces nectar as part of its reproductive strategy. These plants create nectar, which attract pollinating insects and sometimes other animals such as birds. Nectar source plants are important for beekee ...
for bees in Malaysia. Cross-pollination is a necessity because the anther is absent in most functionally female flowers. Although
apomixis In botany, apomixis is asexual reproduction without fertilization. Its etymology is Greek for "away from" + "mixing". This definition notably does not mention meiosis. Thus "normal asexual reproduction" of plants, such as propagation from cuttin ...
may occur in some cultivars, rambutans, like lychee, are dependent upon insects for pollination. In Malaysia, where only about one percent of the female flowers set fruit, no fruit is set on bagged flowers while hand pollination resulted in a 13 percent fruit set. Pollinators may maintain a fidelity to either male or hermaphroditic flowers (trees), thus limiting pollination and fruit set under natural conditions where crossing between male and female flowers is required.


Cultivars

Well over 200
cultivar A cultivar is a type of cultivated plant that people have selected for desired traits and when propagated retain those traits. Methods used to propagate cultivars include: division, root and stem cuttings, offsets, grafting, tissue culture, ...
s were developed from selected clones available throughout tropical Asia. Most of the cultivars are also selected for compact growth, reaching a height of only 3–5 m for easier harvesting. Compared to propagated rambutan clones, rambutans taken from the wild have a higher acidity and potential for various food purposes. In Indonesia, 22 rambutan cultivars were identified with good quality, with five as leading commercial cultivars: 'Binjai', 'Lebak Bulus', 'Rapiah', 'Cimacan' and 'Sinyonya', with other popular cultivars including 'Simacan', 'Silengkeng', 'Sikonto' and 'Aceh kuning'. In the
Malay peninsula The Malay Peninsula (Malay: ''Semenanjung Tanah Melayu'') is a peninsula in Mainland Southeast Asia. The landmass runs approximately north–south, and at its terminus, it is the southernmost point of the Asian continental mainland. The area ...
, commercial varieties include 'Chooi Ang', 'Peng Thing Bee', 'Ya Tow', 'Azimat', and 'Ayer Mas'. In Nicaragua, a joint World Relief–European Union team distributed seedlings to organizations such as Ascociación Pueblos en Acción Comunitaria in 2001 to more than 100 farmers. Some of these farmers saw the first production of rambutans from their trees in 2005–2006 with development directed at the local market. In the Philippines, two cultivars of rambutans are distinguished by their seed. The common rambutan seed and fruit are difficult to separate, while the 'Maharlika Rambutan' fruit separates cleanly from its seed. The fruit taste and size of these two cultivars are identical, but the 'Maharlika Rambutan' is more popular with a higher price.


Nutrients and phytochemicals

Rambutan fruit is 78% water, 21%
carbohydrate In organic chemistry, a carbohydrate () is a biomolecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen–oxygen atom ratio of 2:1 (as in water) and thus with the empirical formula (where ''m'' may or ma ...
s, 1%
protein Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, respo ...
, and has negligible
fat In nutrition science, nutrition, biology, and chemistry, fat usually means any ester of fatty acids, or a mixture of such chemical compound, compounds, most commonly those that occur in living beings or in food. The term often refers spec ...
(table; data are for canned fruit in syrup; raw fruit data are unpublished). In terms of nutritional content, the canned fruit contains only
manganese Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese is a transition metal with a multifaceted array of industrial alloy use ...
at a moderate level (16% of the
Daily Value The Reference Daily Intake (RDI) used in nutrition labeling on food and dietary supplement products in the U.S. and Canada is the daily intake level of a nutrient that is considered to be sufficient to meet the requirements of 97–98% of health ...
), while providing 82
calorie The calorie is a unit of energy. For historical reasons, two main definitions of "calorie" are in wide use. The large calorie, food calorie, or kilogram calorie was originally defined as the amount of heat needed to raise the temperature of on ...
s in a 100 gram reference amount (table). Other
micronutrient Micronutrients are nutrient, essential dietary elements required by organisms in varying quantities throughout life to orchestrate a range of physiological functions to maintain health. Micronutrient requirements differ between organisms; for exam ...
s are at a low level. As an un
pigment A pigment is a colored material that is completely or nearly insoluble in water. In contrast, dyes are typically soluble, at least at some stage in their use. Generally dyes are often organic compounds whereas pigments are often inorganic compo ...
ed fruit
flesh Flesh is any aggregation of soft tissues of an organism. Various multicellular organisms have soft tissues that may be called "flesh". In mammals, including humans, ''flesh'' encompasses muscle Skeletal muscles (commonly referred to as mu ...
, rambutan does not contain significant
polyphenol Polyphenols () are a large family of naturally occurring organic compounds characterized by multiples of phenol units. They are abundant in plants and structurally diverse. Polyphenols include flavonoids, tannic acid, and ellagitannin, some of ...
content, but its colorful rind displays diverse
phenolic acid Phenolic acids or phenolcarboxylic acids are types of aromatic acid compounds. Included in that class are substances containing a phenolic ring and an organic carboxylic acid function (C6-C1 skeleton). Two important naturally occurring types of ...
s, such as syringic, coumaric, gallic, caffeic, and ellagic acids. Rambutan seeds contain equal proportions of
saturated Saturation, saturated, unsaturation or unsaturated may refer to: Chemistry * Saturation, a property of organic compounds referring to carbon-carbon bonds ** Saturated and unsaturated compounds **Degree of unsaturation ** Saturated fat or fatty ac ...
and unsaturated
fatty acids In chemistry, particularly in biochemistry, a fatty acid is a carboxylic acid with an aliphatic chain, which is either saturated or unsaturated. Most naturally occurring fatty acids have an unbranched chain of an even number of carbon atoms, f ...
, where arachidic (34%) and oleic (42%) acids, respectively, are highest in fat content. The pleasant
fragrance An aroma compound, also known as an odorant, aroma, fragrance or flavoring, is a chemical compound that has a smell or odor. For an individual chemical or class of chemical compounds to impart a smell or fragrance, it must be sufficiently vol ...
of rambutan fruit derives from numerous
volatile organic compounds Volatile organic compounds (VOCs) are organic compounds that have a high vapour pressure at room temperature Colloquially, "room temperature" is a range of air temperatures that most people prefer for indoor settings. It feels comfortable to a ...
, including beta-damascenone,
vanillin Vanillin is an organic compound with the molecular formula . It is a phenolic aldehyde. Its functional groups include aldehyde, hydroxyl, and ether. It is the primary component of the extract of the vanilla bean. Synthetic vanillin is now used ...
,
phenylacetic acid Phenylacetic acid (PAA; conjugate base phenylacetate), also known by various synonyms, is an organic compound containing a phenyl functional group and a carboxylic acid functional group. It is a white solid with a strong honey-like odor. Endogen ...
, and
cinnamic acid Cinnamic acid is an organic compound with the formula C6H5-CH=CH- COOH. It is a white crystalline compound that is slightly soluble in water, and freely soluble in many organic solvents. Classified as an unsaturated carboxylic acid, it occurs n ...
.


Gallery

File:Rambutan Muda.jpg, Young rambutan fruit in Malaysia File:RambutanKuning.jpg, Ripe yellow rambutan fruit in Malaysia File:LakeSampalocjf7542 08.JPG, Unripe rambutan fruits in the Philippines File:Rambutan Binjai Pasar Baru Jakarta.JPG, 'Rambutan Binjai', one of the leading cultivars in Indonesia File:Three rambutan colors.jpg, Three colors of rambutan


See also

*
List of culinary fruits This list contains the names of Fruit, fruits that are considered Eating, edible either raw or in some Cuisine, cuisines. The word "fruit" is used in several different ways. The definition of fruit for this list is a culinary fruit, that is, "Any ...
*
Pomology Pomology (from Latin , “fruit,” + ) is a branch of botany that studies fruit and its cultivation. The term fruticulture—introduced from Romance languages (all of whose incarnations of the term descend from Latin and )—is also used. Pomol ...
*
Pulasan ''Nephelium ramboutan-ake'', the pulasan, is a tropical fruit in the soapberry family Sapindaceae. It is closely related to the rambutan and sometimes confused with it. Other related soapberry family fruits include lychee and longan. Usually ...


References

{{Authority control Edible fruits Fruits originating in Asia Medicinal plants Trees of Thailand Trees of Malesia Tropical fruit Nephelium Fruit trees