According to Kew Species Profiles[KSP]
Kew Species Profiles
- General Description
A tall forest tree from west Central Africa, black hyedua is valued for its timber, which is used in general carpentry in Ghana as a substitute for rosewood ( Dalbergia spp.)
Black hyedua is a West African timber tree, common in its natural habitat where it generally grows in small stands in a variety of forest types, from closed rainforest to drier semi-deciduous forest. The papery pods contain a single seed and are dispersed intact, mainly by wind. The thin pod walls soon rot away on the ground leaving the seed free to germinate.
- Species Profile
Geography and distribution
Guibourtia ehiegrows in African lowland forest. It occurs in the upper Guinea forest block, in Côte d'Ivoire, Liberia and Ghana, is absent from the more arid and unforested Dahomey interval and then reappears in the lower Guinea forest block in Nigeria, Cameroon, Equatorial Guinea and Gabon.
Overview: Guibourtia ehie is a forest tree up to 45 m high with a trunk up to 1 m in diameter.
Leaves: The leaves are composed of two asymmetrical leaflets, each shaped like a half-moon. The outer side of each leaflet is at least three times as broad as the inner side, ending in a long, curved tip.
Flowers: The white flowers are scented and arranged along short axes, which in turn are combined with other flowering ‘spikes’ to form a branched flowering structure, which measures up to 25 cm long.
Fruits: The fruits (pods) are flat and papery, and their surfaces are covered with a network of fine veins. Each fruit contains a single seed.
Some species of Guibourtiahave resin in the leaves that appears as translucent yellow dots when the leaves are held to the light and/or seeds that bear an aril (a soft, fleshy and often colourful layer covering part or all of the external seed surface), but G. ehie has neither gland dots nor arils.
Study of the genus by Kew botanist
The leguminous genus Guibourtiais currently considered to comprise 14 species. Thirteen occur in tropical Africa, but G. hymenaeifolia is found only in the Neotropics. A group of organisms that are found on both sides of the Atlantic Ocean are said to have an amphi-Atlantic distribution. This distribution pattern is relatively unusual in legume tree genera and there has been some doubt as to whether the Neotropical and African Guibourtiaspecies belong together.
To explore this and other questions, Guibourtiais currently the subject of an MSc study by Kew botanist Frances Crawford (supervised by Reading University). Frances is using morphological and genetic (DNA) data to investigate the genus. Preliminary results indicate that the neotropical species is a true Guibourtia that arrived in the Neotropics from Africa by long distance dispersal.
Threats and conservation
Black hyedua is widespread in West Africa and several populations are known to occur within protected areas but its exploitation for timber could result in population decline. Based only on geographical range data from herbarium specimens, Guibourtia ehie is considered to be of Least Concern according to IUCN red list criteria (IUCN 2001).
However, it was previously assessed as Vulnerable (as a result of an assessment arising from an African regional workshop in 1996), and further research and fieldwork are required to verify its true conservation status.
Conservation assessments carried out by Kew
Guibortia ehieis being monitored as part of the 'Sampled Red List Index Project', which aims to produce conservation assessments for a representative sample of the world’s plant species. This information will then be used to monitor trends in extinction risk and help focus conservation efforts where they are needed most.
Guibourtia ehie is mainly used for timber production, which is a popular substitute for rosewood ( Dalbergiaspecies). It is used for fine furniture and cabinetwork, turnery, decorative veneers and flooring.
The bark exudes a gum if cut, but fresh gum is not produced in commercial quantities. However, ‘fossil’ resin (copal) is collected from the ground in parts of West Africa and made into sweet-smelling necklaces by local traders. In Nigeria, this resin is burnt for lighting.
This species at Kew
Pressed and dried specimens of Guibourtia ehie are held in Kew’s Herbarium, where they are available to researchers from around the world by appointment. The details, including an image (pictured above), of one of these specimens can be seen online in the Herbarium Catalogue.
Specimens of the wood and bark of black hyedua are held in Kew’s Economic Botany Collection, available to researchers by appointment.
- Cameroon, Gabon, Ghana
- Various forest types, from closed rainforest to drier semi-deciduous forest.
- Least Concern (LC) according to IUCN Red List criteria.
- Black hyedua
Guibourtia ehie (A.Chev.) J.Léonard appears in other Kew resources:
Herbarium Catalogue (7 records)
|Date Identified||Reference||Herbarium Specimen||Type Status|
|Apr 20, 1964||Punch, C. [s.n.], Nigeria||K000623007|
|Oct 1, 1950||Le Testu, M.G. , Gabon||K000623005|
|Mar 1, 1949||Chevalier, A. , Ivory Coast||K000417931||Unknown type material|
|Vigne, C. , Ghana||K000387209|
|Adam, J.G. , Liberia||K000623006|
|Catterall , Nigeria||K000623008|
|Latilo, M.G. , Nigeria||K000623009|
First published in Bull. Jard. Bot. État Bruxelles 19: 404 (1949)
-  (2009) Scripta Botanica Belgica 41: 1-517
-  Govaerts, R. (2003) World Checklist of Seed Plants Database in ACCESS G: 1-40325
-  Lock, J.M. (1989) Legumes of Africa a check-list . Royal Botanic Gardens, Kew.
-  Contu, S. (2010). Guibourtia ehie. Assessment using IUCN Categories and Criteria 3.1 (IUCN 2001). Royal Botanic Gardens, Kew.
-  Lewis, G., Schrire, B., Mackinder, B. & Lock, J.M. (eds) (2005). Legumes of the World. Royal Botanic Gardens, Kew.
-  Sita, P. & Moutsambote, J.-M. (2005) Catalogue des plantes vasculaires du Congo , ed. sept. 2005: 1-158. ORSTOM, Centre de Brazzaville.
-  Burkill, H.M. (1995). The Useful Plants of West Tropical Africa: Vol. 3 Families J – L: 129. Royal Botanic Gardens, Kew.
-  Publ. I.N.É.A.C., Ser. Sci. 45: 78.
-  in Bull. Jard. Bot. Brux. 19: 404 (1949)
Flora of West Tropical Africa
International Plant Names Index
The International Plant Names Index (2016). Published on the Internet http://www.ipni.org
[B] © Copyright 2016 International Plant Names Index. https://creativecommons.org/licenses/by/3.0
Kew Species Profiles
Kew Species Profiles
World Checklist of Selected Plant Families
World Checklist of Selected Plant Families(2016). Published on the Internet http://apps.kew.org/wcsp/
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[F] © Copyright 2016 International Plant Names Index and World Checkist of Selected Plant Families. https://creativecommons.org/licenses/by/3.0