''Coula edulis'' is a

tree In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, e.g., including only woody plants with secondary growth, only ...

in the genus '' Coula'', native to tropical western

Africa Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac ...

from

Sierra Leone Sierra Leone, officially the Republic of Sierra Leone, is a country on the southwest coast of West Africa. It is bordered to the southeast by Liberia and by Guinea to the north. Sierra Leone's land area is . It has a tropical climate and envi ...

Angola Angola, officially the Republic of Angola, is a country on the west-Central Africa, central coast of Southern Africa. It is the second-largest Portuguese-speaking world, Portuguese-speaking (Lusophone) country in both total area and List of c ...

. Both the timber and nuts have a number of uses.

Description

It is an

evergreen In botany, an evergreen is a plant which has Leaf, foliage that remains green and functional throughout the year. This contrasts with deciduous plants, which lose their foliage completely during the winter or dry season. Consisting of many diffe ...

tree growing to a height of , and has a dense crown that can cast deep shade. The

leaves A leaf (: leaves) is a principal appendage of the stem of a vascular plant, usually borne laterally above ground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, stem, ...

are arranged alternately, simple, long and 4 cm broad, with an entire margin and an acuminate apex. The

flower Flowers, also known as blooms and blossoms, are the reproductive structures of flowering plants ( angiosperms). Typically, they are structured in four circular levels, called whorls, around the end of a stalk. These whorls include: calyx, m ...

s are produced from April to June, and are greenish yellow, with either four or five petals. The nut is an ellipsoidal drupe available from August to January, 3–4 cm long, with flesh surrounding the kernel, 5–6 mm thick, smooth in texture and can be red or green. The kernel shell is extremely hard and makes germination difficult. The nuts are usually found under the mother trees. Common names include Gabon nut and African walnut. It is not related to the

walnut A walnut is the edible seed of any tree of the genus '' Juglans'' (family Juglandaceae), particularly the Persian or English walnut, '' Juglans regia''. They are accessory fruit because the outer covering of the fruit is technically an i ...

, being so named because its nuts bear a superficial resemblance to the walnut. ;Local names *Anamemila, Apopo, Sida, in

Nigeria Nigeria, officially the Federal Republic of Nigeria, is a country in West Africa. It is situated between the Sahel to the north and the Gulf of Guinea in the Atlantic Ocean to the south. It covers an area of . With Demographics of Nigeria, ...

*Bombulu in

Zaire Zaire, officially the Republic of Zaire, was the name of the Democratic Republic of the Congo from 1971 to 18 May 1997. Located in Central Africa, it was, by area, the third-largest country in Africa after Sudan and Algeria, and the 11th-la ...

*Dibetou in

Gabon Gabon ( ; ), officially the Gabonese Republic (), is a country on the Atlantic coast of Central Africa, on the equator, bordered by Equatorial Guinea to the northwest, Cameroon to the north, the Republic of the Congo to the east and south, and ...

and

Ivory Coast Ivory Coast, also known as Côte d'Ivoire and officially the Republic of Côte d'Ivoire, is a country on the southern coast of West Africa. Its capital city of Yamoussoukro is located in the centre of the country, while its largest List of ci ...

*Mpengwa in

Ghana Ghana, officially the Republic of Ghana, is a country in West Africa. It is situated along the Gulf of Guinea and the Atlantic Ocean to the south, and shares borders with Côte d’Ivoire to the west, Burkina Faso to the north, and Togo to t ...

;Dialect names *Akiouhia in

Tchaman The Tchaman or Ébrié are an Akan people living in the Abidjan region of Côte d'Ivoire. Originally called the "Tchaman/Kyama/Gyama" or "Achan" (both of which mean "the chosen ones" in the Ebrié language), the name Ébrié was given to them by ...

*Atsan in Atié *Bogüe in

Agni Agni ( ) is the Deva (Hinduism), Hindu god of fire. As the Guardians of the directions#Aṣṭa-Dikpāla ("Guardians of Eight Directions"), guardian deity of the southeast direction, he is typically found in southeast corners of Hindu temples. ...

*Howôtou in Oubi *Ouatou in Kroumen *Séatou or Sratou in Guéré The plant is a source of minquartynoic acid, a rare fatty acid.

Distribution and habitat

The species is native to tropical western

from

. It is plentiful in the

Democratic Republic of Congo The Democratic Republic of the Congo (DRC), also known as the DR Congo, Congo-Kinshasa, or simply the Congo (the last ambiguously also referring to the neighbouring Republic of the Congo), is a country in Central Africa. By land area, it is t ...

and

. It prefers tropical regions and is tolerant of light shade. It can be found in the top canopy of forest as well as the lower story and has no special soil requirements.

Uses

Every part of the tree is used in both raw and finished states. Its timber and nuts are used extensively. The bark is used locally to produce rinses or enemas for loin pains or kidney problems. The wood is used to make pilings for bridges and railway ties in addition to charcoal and standard construction.

Nuts

The nut is 50% fat of which 87% is

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 due to the presence of impurities. In chemical terms, oleic acid is cl ...

. The flavour is mild and is said to be between the flavour of

hazelnuts The hazelnut is the nut (fruit), fruit of the hazel, hazel tree and therefore includes any of the nuts deriving from species of the genus ''Corylus'', especially the nuts of the species ''Corylus avellana''. They are also known as cobnuts or fil ...

and chestnuts. Used in a variety of ways it can be boiled, roasted and fermented before being eaten. The nuts can be used in recipes and mixed with meats. It is also a source of cooking oil and ground flour. The nut is a favoured food item of chimpanzees, though the tough shell necessitates the use of a rock as hammer to gain access to the kernel.

References

*Davidson, Alan. Oxford Companion to Food (1999). Gabon Nut, p. 328.
Agro Forestry Database: ''Coula edulis''
{{Taxonbar, from=Q2998754 Olacaceae Edible nuts and seeds Flora of West Tropical Africa Trees of Africa Taxa named by Henri Ernest Baillon Plants described in 1862