1. Family: Malvaceae Juss.
    1. Genus: Theobroma L.
      1. Theobroma cacao L.

        The edible properties of Theobroma cacao were discovered over 2,000 years ago by the local people of Central America living deep in the tropical rainforests. In the year 2008-2009 world cocoa production was 3,515,000 tonnes. This is equivalent to the weight of a line of double-decker buses stretching more than three times the length of Britain!

    [KSP]

    Kew Species Profiles

    General Description
    Cocoa tree is the source of one of the world's most delicious and familiar products... chocolate.

    The edible properties of Theobroma cacao were discovered over 2,000 years ago by the local people of Central America living deep in the tropical rainforests. In the year 2008-2009 world cocoa production was 3,515,000 tonnes. This is equivalent to the weight of a line of double-decker buses stretching more than three times the length of Britain!

    The scientific name Theobroma cacao was given to the species by the Swedish botanist Carl Linnaeus in 1753, when he published it in his famous book Species Plantarum. Theobroma means 'food of the gods' in Latin, and cacao is derived from the Nahuatl (Aztec language) word xocolatl, from xococ (bitter) and atl (water).

    Chocolate is more than just a delicacy; evidence suggests that eating between 46 and 105g chocolate a day can have a moderate effect on lowering blood pressure. Cocoa has been used for an array of medicinal purposes. Unfermented cocoa seeds and the seed coat are used to treat a variety of ailments, including diabetes, digestive and chest complaints. Cocoa powder, prepared from fermented cocoa seeds, is used to prevent heart disease. Cocoa butter is taken to lower cholesterol levels, although its efficacy is unclear.

    It is also used widely in foods and pharmaceutical preparations, as well as being used as a rich moisturiser for the skin.

    Species Profile
    Geography and distribution

    Cocoa is native to Mexico, Central America and northern South America (Colombia, Ecuador, Venezuela, Brazil, Guyana, Surinam and French Guiana). It has also been introduced as a crop plant into many tropical African and Asian countries.

    In its natural habitat, cocoa grows in the understorey of evergreen tropical rainforest. It often grows in clumps along river banks, where the roots may be flooded for long periods of the year. Cocoa grows at low elevations, usually below 300 metres above sea level, in areas with 1,000 to 3,000 mm rainfall per year.

    Description Overview:Cocoa is a spindly, evergreen tree 5 to 8 m tall, found growing in the shade of giant trees occupying the top layer of the rain forest. It has a taproot, which penetrates far below the soil surface.

    Leaves: Its dark green leaves are shiny, leathery, egg-shaped or elliptic in shape and 20 to 35 cm long and 7 to 8 cm wide. The leaf surfaces are hairless or covered in scattered star-shaped hairs. The base of the leaf is rounded or heart-shaped, and the tip is long and drawn out allowing water to drip from it.

    Flowers: Cocoa flowers are small, yellowish white to pale pink, and grouped together in clusters arising directly from the trunk (cauliflory). Flowers are produced throughout the year.

    Fruit: In the wild, cocoa trees are pollinated by midges, and only about 5% of flowers receive enough pollen to start fruit development. When they are pollinated there is a dramatic change as the tiny flowers develop into massive fruits.

    Cocoa pods

    The fruit is an egg-shaped red to brown berry (commonly referred to as a 'cocoa pod'), 15 to 25 cm long, with a more or less knobbly surface and lines from top to bottom. The 'pod' contains 30 to 40 seeds, each of which is surrounded by a bitter-sweet white pulp. In the wild the seeds are dispersed and eaten by different mammals like agutis and monkies. When the seeds are dried and fermented in the sun they are brownish red, and known as cocoa beans.

    The genus Theobroma

    The genus (the cocoa species and its siblings) Theobroma consists of 22 species, including the Brazilian species Theobroma cupuacu, which provides a bitter-sweet pulp widely used in juice drinks in the Amazon. The Malvaceae family, of which cocoa is a member, contains many economically useful plants. These include cotton ( Gossypium hirsutum), ornamental Hibiscusspecies, okra (ladies fingers, Hibiscus esculentus), Ceibaand Bombaxspecies (from which kapok fibre is derived), durian fruit ( Durio zibethinus) and balsawood ( Ochroma pyramidale).

    The history of chocolate

    The edible properties of Theobroma cacao were discovered over 2,000 years ago by the indigenous people of Central America living deep in the tropical rainforests.

    The Olmecs living in Mexico and Guatemala established their first cacao plantations around 400 BC, and by 250 AD the Mayans depicted cocoa in their elaborate hieroglyphic writings and on carvings and paintings.

    Historical accounts about also point to widespread use of chocolate in Maya and Aztec engagement and marriage ceremonies and religious rituals. In this respect chocolate occupied the same niche that expensive French wines and champagne do in European culture today.

    The Aztecs and Maya peoples had many ways of making food and drink from cocoa seeds (commonly referred to as 'cocoa beans'). They also used the beans as money, for example exchanging one turkey for 200 beans, or one slave for 100 beans.

    Cocoa beans were so precious that only the royals, warriors and the wealthy could afford to eat and drink chocolate. The hieroglyphs tell us that the Aztecs and Maya peoples drank cocoa powder suspended in water, and used flavourings such as chillies ( Capsicum annuum), vanilla ( Vanilla planifolia), achiote ( Bixa orellana), aromatic herbs and honey.

    From Columbus to Cadbury

    Chocolate was seen in Mexico by Christopher Colombus in August 1502. It is said that he came across a large canoe loaded with some small beans that looked to him like goat droppings, and that he paid them little attention! However, once Spanish explorers discovered its decadent delights in the 1520s, they brought cocoa beans home, sweetened the water-based recipe and spread this delicacy throughout Europe. By the middle of the 17th century sweetened hot chocolate was very popular throughout Europe, especially among the elite.

    Cocoa arrived in the British Isles in the 1650s, which was more or less at the same time as coffee. With Cromwell’s forces Britain took over the control of Jamaica from the Spanish. At the time cacao plantations were already flourishing there, and these became the main source of British chocolate.

    The story goes that the first person to dissolve cocoa in milk was the British medical doctor and avid collector, Sir Hans Sloane. As a young man, he was stationed as a doctor in Jamaica where he collected the very chocolate plant that Carl Linnaeus used to give chocolate its scientific name. Hans Sloane, also a clever businessman, later sold the idea to the Cadbury family. Hans Sloane’s collections later founded the British Museum, and his chocolate specimen can be seen on display in the Darwin Centre in the Natural History Museum in London.

    What a cocoa bean is made ofCocoa beans (dried and fermented cocoa seeds) possess 45-53.2% fat in the form of cocoa butter (also known as theobroma oil) which is made up of a variety of fatty acids.

    Cocoa beans contain up to10% of phenols and flavenoids which are antioxidants potentially inhibiting cancer or cardiovascular diseases, as well as potassium, magnesium, calcium and iron. Additionally, they contain 1-3% theobromine and caffeine, alkaloids that stimulate the central nervous system. Caffeine has a positive effect on mental alertness, for instance when taken in caffeinated drinks.

    The ingredients for chocolate – cocoa powder and cocoa butter (solids) – are prepared from fermented and roasted cocoa seeds. A typical bar of milk chocolate contains around 15% cocoa liquor and 20% cocoa powder. The distinctive flavour of chocolate develops during the fermentation process.

    Alternative to peat mulch

    The crushed shells of cocoa beans are used as an alternative to peat mulch. Mulches are layered on to the soil surface to suppress weeds, conserve moisture, improve its visual appearance and minimize erosion. Not only does this make good use of cocoa-shell, which is a by-product of the chocolate industry, but it also helps reduce the use of peat.

    Peat bogs are important sites for wildlife and also help to protect the earth from global warming. In Great Britain, over 94% of the 69,700 hectares of peat bogs have been damaged or destroyed. Most of this damage has occurred in the last 50 or so years, since the promotion of large-scale use of peat for the horticultural industry, which now discourages this.

    Known hazards

    Cocoa is known to have minor or moderate interactions with certain drugs, and it may cause adverse reactions when eaten or applied to the skin. Chocolate is considered a delicacy for humans, but cocoa solids contain the alkaloid theobromine, which is toxic to pets such as cats and dogs. Excessive amounts of chocolate and cocoa may be harmful during pregnancy and breastfeeding.

    Millennium Seed Bank: Seed storageKew's 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.

    As the seeds of the cocoa tree are recalcitrant (meaning that the seeds are not amenable to long term frozen storage as they would not survive drying to the required levels in the seed bank), it is not possible store this kind of seed in a seed bank. Conservation of cocoa varieties therefore rely entirely on live trees in plantations and in the wild.

    Cultivation

    Theobroma cacao grows best under tropical conditions, with strong light and high humidity. A loam-based compost with plenty of organic matter (such as coir) should be used. The tree should be kept moist and the foliage damped-over daily, except during sunny weather when scorching may occur. Soft water should be used to prevent limescale deposits on the leaves. Mulching around the base of the tree with well-rotted compost will help the soil to retain moisture and prevent weeds. A balanced liquid of leaves should be given during the summer and high potash during the winter, once a week. Pruning should be carried out to maintain the required shape.

    Cocoa can be propagated by seed, using a propagator set to a temperature of 22 to 23 ˚C. Germination should take between 10 and 14 days. The seedlings grow very quickly and require regular potting up. Flowers are borne on the old wood of the tree, and are pollinated by ants at Kew, although hand-pollination using a paintbrush is possible. Once the tiny flowers are fertilised, the fruit grows into the familiar 'cocoa pod' (the fruit is actually a berry). Growing-on temperatures in a glasshouse should be 22 to 24 ˚C during the day and 18 ˚C during the night. Cocoa is prone to glasshouse pests, such as mealy bug and scale insect. These can be kept in check by using biological controls or systemic insecticides. Small infestations can be dealt with using alcohol and a paint brush.

    Commercial cocoa cultivation

    In 2008-2009 the world cocoa production was 3,515,000 tonnes. This is equivalent to the weight of a line of double-decker buses stretching more than three times the length of Britain! Despite the fact that cocoa is native to tropical America, world production (2008-2009) is spread as follows: West Africa 71%, Central and South America 13%, Southeast Asia 16%.

    A number of different cocoa cultivars are grown commercially, and these have historically been divided into three main groups:

    • The Forestero group is cultivated in West Africa and Brazil and represents 80 to 90% of the world’s cocoa plantations. In these cultivars the fruit is rounded and almost smooth, and the pod husks are hard and green with 30 or more seeds per pod.
    • The Criollo group represents about 10% of the world’s cocoa plantations. Its importance is on the wane, but it is still grown in the Caribbean, Venezuela, Ecuador and Papua New Guinea. It is, however, the most highly appreciated and the Criollo beans have always been used for the best quality chocolates. The yellow or red pod husks are soft and thin and there are 30 or more seeds per pod.
    • The Trinitario group is a good quality hybrid between Criollo and Forestero, with a good, but less intense, aroma than Criollo beans. Trinitario husks are hard and thick, and variable in colour, with 30 or more seeds per pod.
    Cocoa at Kew

    Theobroma cacao can be seen in Kew’s Princess of Wales Conservatory, and also in the Palm House, which displays plants from tropical rainforests, including those of economic value such as banana ( Musa), rubber ( Hevea), cotton ( Gossypium) and coffee ( Coffea).

    There are over a hundred specimens of Theobroma cacao in Kew's Economic Botany Collection. These include samples of bark, shells, seeds ('beans'), cocoa butter, cocoa liquor, nibs (the dried and roasted kernel of the cocoa bean that remains after the husk has been removed), powder, fruit ('pods'), paste, leaves, flowers and even a carved wooden elephant. These items are available to researchers on request. To view a selection of this collection and to discover more about the chocolate tree, visit the Plants+People exhibition in Museum No.1.

    Kew's Herbarium contains both dried and alcohol-preserved specimens of Theobroma cacao. Details of some of these can be viewed in the Herbarium Catalogue. These include images of specimens from the herbaria of George Bentham (1800-1884, author of the classic Handbook of the British Flora) and William Hooker (1785-1865, Kew’s first official Director).

    Distribution
    Brazil, Ecuador, Mexico, Venezuela
    Ecology
    Evergreen tropical rainforest.
    Conservation
    Not of conservation concern.
    [KSP]
    Use
    Food, medicinal, cosmetics, peat mulch alternative.

    Images

    Distribution

    Found In:

    Brazil North, Colombia, Ecuador, French Guiana, Peru, Venezuela

    Introduced Into:

    Andaman Is., Belize, Cameroon, Cayman Is., Central American Pac, China South-Central, Cook Is., Cuba, Dominican Republic, El Salvador, Fiji, Ghana, Guatemala, Guinea, Gulf of Guinea Is., Hainan, Haiti, Honduras, Ivory Coast, Jamaica, Leeward Is., Mexico Southeast, Mexico Southwest, Nicobar Is., Nigeria, Puerto Rico, Seychelles, Togo, Trinidad-Tobago, Windward Is., Zaïre

    Common Names

    English
    Cocoa tree

    Theobroma cacao L. appears in other Kew resources:

    Date Identified Reference Herbarium Specimen Type Status
    Jan 1, 1991 Lowrie, S.R. [521], Brazil K000731712
    Jan 1, 1991 Flores [341], Peru K000731718
    Jan 1, 1990 Alexiades, M. [958], Peru K000731716
    Jan 1, 1990 Flores [77], Peru K000731719
    May 24, 1986 Cid Ferreira, C.A. [7236], Brazil K000731714
    Jan 1, 1964 Saltzmann [s.n.], Bahia K000381047
    Irvine, D. [D1 418], Ecuador 51211.000
    s.coll. [Cat. no. s.n.] K001132315
    Bahia K000381048
    Anderson [s.n.], St. Lucia K000381049
    s.coll [4736], Brazil K000731710
    Milliken, W. [1816], Brazil K000731711
    Dorr, L.J. [DORR7864], Venezuela K000731713
    Little, E.L Jr. [6483], Ecuador K000731715
    Graham, J. [253], Peru K000731717
    Milliken, W. [1816], Brazil 29047.884
    Hinton, G.B. [7531], Mexico K000661171
    Hinton, G.B. [7531], Mexico K000661172
    Sasaki, D. [1884], Mato Grosso K000447917
    Cazalet, P. [7653], Ecuador 18968.000
    Silva, L.A.M. [667], Brazil K001213351
    Hostmann [440], Suriname K001213352
    Forbes, J. [34], Brazil K001213353
    Prance, G.T. [8079], Brazil K001213354
    Anderson, A.B. [1129], Brazil K001213355
    Ule, E. [5032], Brazil K001213356
    Trail, J.W.H. [63], Brazil K001213357
    Trail, J.W.H. [58], Brazil K001213358
    Cid Ferreira, C.A. [3102], Brazil K001213359

    First published in Sp. Pl.: 782 (1753)

    Accepted in:

    • [1] (2016) Englera 29(3): 1-356
    • [2] Sykes, W.R. (2016) Flora of the Cook Islands . National Tropical Botanical Garden, Hawaii
    • [3] (2014) Phytotaxa 171: 1-78
    • [4] (2012) Smithsonian Contributions to Botany 98: 1-1192
    • [5] Garcia-Mendoza, A.J. & Meave, J.A. (eds.) (2012) Diversidad florística de Oaxaca: de musgos a angiospermas (colecciones y listas de especies) , ed. 2: 1-351. Instituto de Biología, Universidad Nacional Autónoma de México
    • [6] (2011) Bothalia, A Journal of Botanical Research 41: 41-82
    • [7] Idárraga-Piedrahita, A., Ortiz, R.D.C., Callejas Posada, R. & Merello, M. (eds.) (2011) Flora de Antioquia: Catálogo de las Plantas Vasculares 2: 1-939. Universidad de Antioquia, Medellín
    • [8] Onana, J.M. (2011) The vascular plants of Cameroon a taxonomic checklist with IUCN assessments . National herbarium of Cameroon, Yaoundé
    • [9] (2010) Taxonomania 29: 1-41
    • [10] (2009) Scripta Botanica Belgica 41: 1-517
    • [11] (2008) Journal of Economic and Taxonomic Botany 32: 403-500
    • [12] Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008) Nuevo Catálogo de la Flora Vascular de Venezuela . Fundación Instituto Botánico de Venezuela
    • [13] Nelson Sutherland, C.H. (2008) Catálogo de las plantes vasculares de Honduras. Espermatofitas . SERNA/Guaymuras, Tegucigalpa, Honduras
    • [15] Flora of China Editorial Committee (2007) Flora of China 12: 1-534. Science Press (Beijing) & Missouri Botanical Garden Press (St. Louis)
    • [17] (2006) Proceedings of the California Academy of Sciences , ser. 4, 57: 247-355
    • [24] Smith, A.C. (1981) Flora Vitiensis Nova. A new flora for Fiji (Spermatophytes only) 2: 1-810. Pacific Tropical Botanical Garden, Lawai
    • [25] (1948-1963) Flore du Congo Belge et du Ruanda-Urundi 1-10: null

    Literature

    • [14] Coe, S. D. & Coe, M. D. (2007). The True Story of Chocolate. 2nd Edition. Thames & Hudson Ltd., London.
    • [16] Young, A. M. (2007). The Chocolate Tree: Natural History of Cacao. Florida University Press, Gainsville.

    • [18] Simpson, B. B. & Ogorzaly, M. C. (2001). Economic Botany. Plants in Our World. 3rd Edition. McGraw-Hill Higher Education, New York.
    • [19] Foster, N. & Cordell, L. S. (eds) (1996). Chillies to Chocolate. The Food the Americas Gave the World. University of Arizona Press, Tucson.
    • [20] Smart, J. & Simmonds, N. W. (1995). The Evolution of Crop Plants. 2nd Edition. Longman Group UK Ltd., Harlow.
    • [21] (1994) Flore des Seychelles Dicotylédones: 1-663. Orstom Editions
    • [22] Coe, S. D. (1994). America’s First Cuisines. University of Texas Press, Austin.
    • [23] Schultes, R. E. & Raffauf, R. F. (1990). The Healing Forest. Dioscorides Press, Portland, Oregon.

    Sources

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checkist of Selected Plant Families (2017). Published on the internet at http://www.ipni.org and http://apps.kew.org/wcsp
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    [B] © Copyright 2017 International Plant Names Index and World Checkist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

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

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

    Neotropikey
    Milliken, W., Klitgard, B. and Baracat, A. (2009 onwards), Neotropikey - Interactive key and information resources for flowering plants of the Neotropics.
    [F] http://creativecommons.org/licenses/by/3.0