Parkia biglobosa | |
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Inflorescences | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Fabales |
Family: | Fabaceae |
Subfamily: | Caesalpinioideae |
Clade: | Mimosoid clade |
Genus: | Parkia |
Species: | P. biglobosa |
Binomial name | |
Parkia biglobosa | |
Synonyms [2] | |
List
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Parkia biglobosa, known in English as the African locust bean, [3] is a perennial deciduous tree in the family Fabaceae. It is found in a wide range of environments in Africa and is primarily grown for its pods that contain both a sweet pulp and valuable seeds. Where the tree is grown, the crushing and fermenting of these seeds constitutes an important economic activity. Various parts of the locust bean tree are used for medicinal and food purposes. As a standing tree, locust bean may have a positive effect on the yield of other nearby crops.
Parkia biglobosa is a dicotyledonous angiosperm belonging to the family Fabaceae (Caesalpinioideae - Mimosoid clade). It is categorized under spermatophytes, vascular plants. [4] It is a deciduous perennial that grows to between 7 and 20 metres high, [5] in some cases up to 30 metres. [6] The tree is a fire-resistant heliophyte characterized by a thick dark gray-brown bark. [5] The pods of the tree, commonly referred to as locust beans, are pink in the beginning and turn dark brown when fully mature. They are 30-40 centimetres long on average, with some reaching lengths of about 45 centimetres. Each pod can contain up to 30 seeds; [5] the seeds are embedded in a sweet, powdery yellow pulp.
In West Africa the bark, roots, leaves, flowers, fruits and seeds are commonly used in traditional medicine to treat a wide diversity of complaints, both internally and externally, sometimes in combination with other medicinal plants. The bark is most important for medicinal uses, followed by the leaves. Medicinal applications include the treatment of parasitic infections, circulatory system disorders, such as arterial hypertension, and disorders of the respiratory system, digestive system and skin. In veterinary medicine, a root decoction is used to treat coccidiosis in poultry. Green pods are crushed and added to rivers to kill fish.
The tree locust bean (also known as "arbre à farine, fern leaf, irú, monkey cutlass tree, two ball nitta-tree, nété and néré") was first written of by Michael Adamson in 1757's West Africa. [7] The use of fermented locust beans in Africa, however, dates as far back as the 14th century. [8]
Geographically, Parkia biglobosa can be found in a belt stretching from the Atlantic coast in Senegal to southern Sudan and northern Uganda. [8] The tree currently exists within a wide range of natural communities but is most abundant in anthropic communities – places where cultivation is semi-permanent. [5]
Annual production of seeds in northern Nigeria is estimated at around 200,000 t. [8] While the products of the tree are not common in international trade, they form an important part of local and regional trade in West Africa. [8] The seeds are especially prized, and much trade occurs locally in the Sahel region where they are transferred between borders. [8]
There are two types of seed within each pod – reddish-dark and dark (black). The ratio between these seeds varies from 1:20 to 1:5, with darker seeds outnumbering lighter seeds. Reddish-dark seeds have a thinner coat and they germinate earlier than black seeds that have not first been acid treated. “Dark seeds have a harder seed coat and require various pretreatments to ensure good germination rates.” [5]
Although the seeds’ usual germination rate has been reported at 75%, germination can be improved by scalding for about 7 minutes, then soaking seeds in hot water overnight prior to planting. [5] Locust tree seedlings “can be established vegetatively in nursery beds by grafting or budding, or by rooting adult cuttings.” [5] These methods have shown good results in 11- to 25-year-old trees in Burkina Faso and Nigeria. [8]
After the initial sowing into seed beds, seedlings at 3 days old can be transplanted into pots. [8] Seedlings typically reach 20-25 centimetres tall after 20 weeks in the nursery, at which point they can be planted out into the field; direct sowing is possible, but its viability largely depends on soil moisture and the degree of insect/rodent threats. [8] Preliminary ploughing “contributes to proper establishment of seedlings in the field with a success rate of 82% four years” in some cases after planting. Seeds can be treated with concentrated sulphuric acid “in a concentration of 97% for 10 minutes and then immersed in water for 24 hours to break their dormancy period.” [9]
Seedlings grow comparatively fast – they can reach a height of 1 metre in just 1 year. [8] They will begin to flower at 5–7 years during the dry season in the Sahel (December to April), while occurring slightly earlier in less dry regions. [8] The tree is pollinated primarily by bats, but can also occur by way of “honeybees, flies, wasps, ants, tenebrionid beetles and tettigometid bugs.” [5] Fruiting can occur at anywhere from 5–10 years, and they will start to ripen just before the first rains and continue over most of the season. [5]
Foliage of locust bean has been found to contribute to soil fertility improvement. In one experiment, the isolated relative effect of locust bean in the third year of the experiment was 86%, compared to 138% for neem, a related tree. [10] The relative index of soil productivity during this time clearly appreciated for locust bean, as well as the accumulation of P and organic C compared with neem. [10]
Shade tolerance of other crops planted the near locust bean tree may present additional problems. In a 2-year experiment on shading, Parkia biglobosa was “found to have suppressive effects on vegetative growth and yield of pearl millet in both years.” [11] Eggplant yields were also suppressed by trees to between one third and one tenth of the yield in controlled plots, which themselves were damaged by rain. [11] Despite this, chilli pepper yields (which were also affected by rain in the controlled plots) increased by up to 150% under the canopy of the locust bean tree. [11]
The tree of the African locust bean requires “between 0-300 metres of altitude, a mean annual rainfall of between 400-700 millimetres and a mean annual temperature of about 24-28°C.” [5] It prefers well-drained, thick clay soils but can also be found on shallow, thin sandy soils. [5]
The yellow pulp, which contains the seeds, is naturally sweet “and is processed into a valuable carbohydrate food. The seeds are processed into a seasoning, known as dawadawa among Hausa and Northern tribes of Ghana. It is known as sikomu among the Igbo people, nune among the Tiv people and irú amongst the Yoruba people of Nigeria.” [12] The pulp is also used to make beverages. [13]
The seeds of the locust bean are the most valuable part of the plant. They are high in lipids (29%), protein (35%), carbohydrates (16%), and are a good source of fat and calcium for rural dwellers. [6] The seed is first cooked to remove the seed coat and then fermented to produce the desired result. Seeds can then be pounded into powder, then formed into cakes. In a study conducted on the fermentation of dawadawa, it was found that Gmelina arborea and banana leaves accelerated fermentation of seeds, while increasing fat, protein and moisture content, but also decreasing carbohydrate content. [14]
The fruit pulp, the leaves and the seeds are also used to feed livestock and poultry. The flowers are attractive to bees and a good source of nectar. [15]
The cultivation of this tree is an important economic activity for many in Africa, including many women. Néré fruits are highly commercialized in Burkina Faso; “over 50% of respondents in a nation-wide survey said they participated in its trade.” [16] In general, women are wholly responsible for the sale of fermented seeds (dawadawa) even though both men and women are equally responsible for the sale of dry seeds. [16]
Indigenous healers in Africa use different parts of the locust bean tree for health benefits. In a survey conducted on healers in Togo, Parkia biglobosa was one of the highest cited plants used for treating hypertension. [17] The tree was also one of two plants “listed as having real wound-healing properties in South-Western Nigeria, influencing the proliferation of dermal fibroblasts significantly.” [18] In a similar survey conducted in Guinea relating to their use of antimalarial plants, Parkia biglobosa was cited among those most often successfully used. [19] In an analysis on the antibacterial properties of the plant, another study found that “these properties compare favourably with those of streptomycin, making it a potential source of compounds used in the management of bacterial infections.” [20]
The cocoa bean or simply cocoa, also called cacao, is the dried and fully fermented seed of Theobroma cacao, from which cocoa solids and cocoa butter can be extracted. Cocoa beans native to the Amazon rainforest are the basis of chocolate, and Mesoamerican foods including tejate, an indigenous Mexican drink.
The honey locust, also known as the thorny locust or thorny honeylocust, is a deciduous tree in the family Fabaceae, native to central North America where it is mostly found in the moist soil of river valleys. Honey locust is highly adaptable to different environments, has been introduced worldwide, and can be an aggressive, invasive species outside of its native range.
Locusts are the swarming phase of certain species of short-horned grasshoppers in the family Acridida.
The Kentucky coffeetree, also known as American coffee berry, Kentucky mahogany, nicker tree, and stump tree, is a tree in the subfamily Caesalpinioideae of the legume family Fabaceae, native to the Midwest, Upper South, Appalachia, and small pockets of New York in the United States and Ontario in Canada. The seed may be roasted and used as a substitute for coffee beans; however, unroasted pods and seeds are toxic. The wood from the tree is used by cabinetmakers and carpenters. It is also planted as a street tree.
Locust tree can mean:
Parkia speciosa, the bitter bean, twisted cluster bean, sator bean, or stink bean, is a plant of the genus Parkia in the family Fabaceae. It bears long, flat edible beans with bright green seeds the size and shape of plump almonds which have a rather peculiar smell, similar to, but stronger than that of the shiitake mushroom, due to sulfur-containing compounds also found in shiitake, truffles and cabbage.
Parkia biglobosa, also known as the African locust bean tree or néré tree.
Acacia mangium is a species of flowering tree in the pea family, Fabaceae, that is native to northeastern Queensland in Australia, the Western Province of Papua New Guinea, Papua, and the eastern Maluku Islands. Common names include black wattle, hickory wattle, mangium, and forest mangrove. Its uses include environmental management and wood.
Dalbergia sissoo, known commonly as North Indian rosewood or shisham, is a fast-growing, hardy, deciduous rosewood tree native to the Indian subcontinent and southern Iran. D. sissoo is a large, crooked tree with long, leathery leaves and whitish or pink flowers.
Inga edulis, known as ice-cream bean, ice-cream-bean, joaquiniquil, cuaniquil, guama or guaba, is a fruit native to South America. It is in the mimosoid tribe of the legume family Fabaceae. It is widely grown, especially by Indigenous Amazonians, for shade, food, timber, medicine, and production of the alcoholic beverage cachiri. It is popular in Peru, Ecuador, Pernambuco-Brazil, Venezuela and Colombia. The taxonomic name Inga is derived from its name with the Tupí people of South America, while the species name edulis is Latin for "edible". The common name "ice-cream bean" alludes to the sweet flavor and smooth texture of the pulp.
Afzelia africana, the African mahogany, afzelia, lenke, lengue, apa, or doussi, is a tree species in the family Fabaceae.
Boscia senegalensis, commonly known as hanza, is a member of the family Capparaceae.
Piscidia piscipula, commonly named Florida fishpoison tree, Jamaican dogwood, or fishfuddle, is a medium-sized, deciduous, tropical tree in the Fabaceae family. It is native to the Greater Antilles, extreme southern Florida and the Bahamas, and the coastal region from Panama northward to the vicinity of Ocampo, Tamaulipas, Mexico. The native Taino of the West Indies discovered that extracts from the tree could sedate fish, allowing them to be caught by hand. This practice led to the tree's common names—fishpoison and fishfuddle. The tree has medicinal value as an analgesic and sedative.
Balanites aegyptiaca is a species of tree, classified as a member of either the Zygophyllaceae or the Balanitaceae. This tree is native to much of Africa and parts of the Middle East.
Treculia africana is a tree species in the genus Treculia which can be used as a food plant and for various other traditional uses. The fruits are hard and fibrous, can be the size of a volleyball and weight up to 8.5 kg (19 lb). Chimpanzees have been observed to use tools to break the fruits into small pieces that they can eat. The fruits contain polyphenols.
Combretum glutinosum is a shrub species of the genus Combretum, found in the Sahel belt in parts of Senegal, Burkina Faso, Ghana, Mali, the Gambia, Niger, Nigeria and Cameroon, across to parts of Sudan. It is known as dooki in Pulaar, Kantakara in Hausa, rat in Wolof and jambakatan kè in Maninka. Its synonyms are Combretum cordofanum Engl. & Diels, C. passargei Engl. & Diels, C. leonense Engl. & Diels.
The environmental impact of cocoa production includes deforestation, soil contamination, and herbicide resistance. The majority of cocoa farms are now located in Côte d'Ivoire and Ghana.
Detarium microcarpum, commonly known as sweet detar, sweet dattock or tallow tree, is an underutilized species of tree legume that grows naturally in the drier regions of West and Central Africa. It has a wide range of uses due to its medicinal properties, edible fruit and hardwood, which is used as fuel. This makes it valuable and appreciated by local communities, but further research and effort are needed for its domestication.
Parkia filicoidea, or African locust bean, is a large, spreading flat-crowned tree to 30 metres tall, the bole of which may be narrowly buttressed to a height of about 3 metres, and up to 120 cm DBH. It occurs in wet evergreen or semi-deciduous forest, sometimes on forest fringes, riverbanks and lakes, termite mounds, at elevations up to 1000 metres from Côte d’Ivoire, east to Sudan and Somalia, Uganda, Kenya, Malawi and south to Angola, Zambia, Zimbabwe and Mozambique. Bark on trunk scaly or smooth, grey to yellow-brown, branchlets glabrous to puberulous.
Parkia bicolor, the African locust-bean, is a species of flowering plant, a tree in the family Fabaceae. It is native to tropical West and Central Africa. Its natural habitats are tropical moist lowland forests, swampland, woodland and savannah.