PROTA homepage Prota 7(2): Timbers/Bois d’œuvre 2
Record display


Elaeodendron buchananii (Loes.) Loes.

Protologue
Engl. & Prantl, Nat. Pflanzenfam., II–IV Nachtr. 1: 223 (1987).
Family
Celastraceae
Synonyms
Cassine buchananii Loes. (1893).
Vernacular names
Elaeodendron (En).
Origin and geographic distribution
Elaeodendron buchananii is widespread, from Sierra Leone east to Kenya and south to Malawi, Zambia and Angola.
Uses
The wood is used for joinery and furniture. It is suitable for heavy construction, heavy flooring, interior trim, ship building, vehicle bodies, mine props, handles, ladders, sporting goods, toys, novelties, turnery, pattern making, veneer and plywood. The wood is also used as firewood and for charcoal production.
Leaf extracts are taken as abortifacient, oxytocic, tonic and vermifuge, and to treat fever. Leaves are chewed against diarrhoea. Root decoctions are drunk to treat digestive upsets, coughing with blood, excessive uterine bleeding and infertility. Root powder is taken to treat syphilis, and it is applied to wounds.
Properties
The heartwood is pale brown to reddish brown and distinctly demarcated from the whitish sapwood. The grain is straight or interlocked, texture moderately fine.
The wood is heavy, with a density of about 800 kg/m³ at 12% moisture content. It has a slight tendency of surface and end checking in drying. Once dry, it is stable in service. At 12% moisture content, the modulus of rupture is 128–135 N/mm², modulus of elasticity 14, 800–15,680 N/mm², compression parallel to grain 66–69 N/mm², shear 16–18 N/mm², cleavage 18 N/mm, Janka side hardness 7650 N and Janka end hardness 9065 N. The wood is fairly easy to saw, although it is hard and tough. It planes well and can be polished to a nice surface. It turns well. The wood is moderately durable. The heartwood is difficult to impregnate with preservatives, the sapwood moderately difficult.
Feeding on the leaves may cause death in livestock after dyspnoea, loss of coordination and diarrhoea. Leaves and fruits are also very poisonous to humans.
A methanol extract of the bark showed cytotoxic activity against L-1210 leukaemic cells, with elabunin, a dammarane-type triterpene, as active principle. A steroidal glycoside, buchaninoside, was isolated from the fruits; it exhibited antifeedant activity against African armyworm (Spodoptera exempta) larvae. Mutangin, a sesquiterpene of the eudesmane type, was isolated from unripe fruits and exhibited moderate antifeedant activity against larvae of the stem borer Chilo partellus.
Botany
Shrub or small to medium-sized tree up to 30 m tall; bole often irregular, up to 60 cm in diameter; bark surface becoming fissured, with many lenticels, dark grey to purplish brown; crown rounded, dense; twigs flattened to quadrangular and pale grey when young, becoming rounded and red-brown, glabrous. Leaves usually opposite, but sometimes alternate, simple; stipules small, free, caducous; petiole 0.5–1.5 cm long; blade elliptical to obovate, (5–)6.5–14(–18) cm × 2–8(–10) cm, cuneate at base, shortly acuminate to acute or obtuse at apex, margins toothed with incurved or appressed teeth, leathery, glabrous, pinnately veined with few lateral veins. Inflorescence an axillary cyme on specialized, 3–5 cm long shoots, glabrous. Flowers unisexual, regular, 4–5-merous, sweet-scented; pedicel c. 1 mm long; sepals rounded, c. 1 mm long; petals free, ovate to oblong, 1.5–2.5 mm long, spreading, white to green or yellow; stamens alternating with petals, c. 1 mm long, free; disk slightly lobed; ovary superior, ovoid-conical, c. 1 mm long, 2–3-celled, style short. Fruit an ellipsoid to globose, fleshy drupe 1.5–2 cm long, usually smooth, pale yellow to pale brown when ripe, 1-seeded.
Elaeodendron buchananii grows slowly. It has been reported that in Kenya young trees are often covered by webs made by caterpillars. The tree is evergreen and may attract livestock in the dry season, which can be problematic because of the risk of poisoning.
Elaeodendron comprises about 40 species and occurs in Asia, Australia, Central America and Africa, where 8 species are found.
The wood of Elaeodendron matabelicum Loes. (synonym: Cassine matabelica (Loes.) Steedman), a shrub or small tree up to 7(–20) m tall occurring in eastern Botswana, Zimbabwe and southern Mozambique, is used for carving utensils such as spoons. Bark and root infusions or decoctions are taken to treat excessive uterine bleeding, bloody diarrhoea and pains, and as aphrodisiac. The roots produce a yellow dye.
The whitish wood of Elaeodendron transvaalense (Burtt Davy) R.H.Archer (synonym: Cassine transvaalensis (Burtt Davy) Codd), a shrub or small tree up to 10(–15) m tall from southern Zambia, southern Angola, northern Namibia, Botswana, Zimbabwe, southern Mozambique, eastern South Africa and Swaziland, is used for implements and utensils. Bark infusions and decoctions are popular for the treatment of stomach complaints, fever, venereal diseases, kidney and bladder complaints, skin diseases, swellings, haemorrhoids, and to improve appetite. Root extracts are sometimes used for similar complaints. Leaves are chewed to treat throat problems, and a leaf decoction is drunk against poisoning. The bark has been used for tanning. The fruits are edible. Elaeodendron transvaalense is sometimes planted as ornamental tree in gardens. Extracts showed in-vitro activity against Trichomonas vaginalis, an important cause of urogenital infections.
In South Africa the brownish wood of Elaeodendron zeyheri Spreng. ex Turcz., a small tree up to 13 m tall, is used for beams and furniture. The wood has rather similar properties as that of Elaeodendron buchananii and is suitable for similar purposes. The bark has been used for tanning and dyeing, and in traditional medicine to treat snakebites. A root decoction has been used as emetic and ordeal poison. Elaeodendron zeyheri has been recorded from southern Mozambique, but is more widespread in eastern South Africa. In the literature it has been much confused with Elaeodendron croceum (Thunb.) DC. (synonym: Cassine papillosa (Hochst.) Kuntze), a shrub or small tree up to 10 m tall occurring in eastern Zimbabwe and eastern South Africa, of which the wood is probably used for similar purposes. Elaeodendron croceum is better known as a medicinal plant.
Ecology
Elaeodendron buchananii occurs in dry evergreen forest, gallery forest and wooded grassland up to 2250 m altitude.
Management
Only seeds are used for propagation. The tree can be managed by pollarding, lopping and pruning.
Genetic resources and breeding
Elaeodendron buchananii is widespread and locally common, and there are no indications that it is threatened by genetic erosion. However, local collection of the bark for medicinal purposes may threaten populations.
Prospects
Elaeodendron buchananii will probably remain of some importance for its timber in areas where it is common, e.g. locally in Kenya. It is not well suited for agroforestry systems because of its slow growth and dense foliage that is poisonous to livestock.
Major references
• Bolza, E. & Keating, W.G., 1972. African timbers: the properties, uses and characteristics of 700 species. Division of Building Research, CSIRO, Melbourne, Australia. 710 pp.
• Chikamai, B.N., Githiomi, J.K., Gachathi, F.N. & Njenga, M.G., undated. Commercial timber resources of Kenya. Kenya Forestry Research Institute (KEFRI), Nairobi, Kenya. 164 pp.
• Coates Palgrave, K., 1983. Trees of southern Africa. 2nd Edition. Struik Publishers, Cape Town, South Africa. 959 pp.
• Maundu, P. & Tengnäs, B. (Editors), 2005. Useful trees and shrubs for Kenya. World Agroforestry Centre - East and Central Africa Regional Programme (ICRAF-ECA), Technical Handbook 35, Nairobi, Kenya. 484 pp.
• Takahashi, A., 1978. Compilation of data on the mechanical properties of foreign woods (part 3) Africa. Shimane University, Matsue, Japan, 248 pp.
Other references
• Beentje, H.J., 1994. Kenya trees, shrubs and lianas. National Museums of Kenya, Nairobi, Kenya. 722 pp.
• Burkill, H.M., 1985. The useful plants of West Tropical Africa. 2nd Edition. Volume 1, Families A–D. Royal Botanic Gardens, Kew, Richmond, United Kingdom. 960 pp.
• Fernandes, L., van Rensburg, C.E.J., Hoosen, A.A. & Steenkamp, V., 2008. In vitro activity of medicinal plants of the Venda region, South Africa, against Trichomonas vaginalis. Southern African Journal of Epidemiology and Infection 23(2): 26–28.
• Kubo, I. & Fukuhara, K., 1990. Elabunin, a new cytotoxic triterpene from an East African medicinal plant, Elaeodendron buchananii. Journal of Natural Products 53(4): 968–971.
• Neuwinger, H.D., 2000. African traditional medicine: a dictionary of plant use and applications. Medpharm Scientific, Stuttgart, Germany. 589 pp.
• Palmer, E. & Pitman, N., 1972–1974. Trees of southern Africa, covering all known indigenous species in the Republic of South Africa, South-West Africa, Botswana, Lesotho and Swaziland. 3 volumes. Balkema, Cape Town, South Africa. 2235 pp.
• Robson, N.K.B., Hallé, N., Mathew, B. & Blakelock, R., 1994. Celastraceae. In: Polhill, R.M. (Editor). Flora of Tropical East Africa. A.A. Balkema, Rotterdam, Netherlands. 78 pp.
• Tsanuo, M.K., Hassanali, A., Jondiko, I.J.O. & Torto, B., 1993. Mutangin, a dihydroagarofuranoid sesquiterpene insect antifeedant from Elaeodendron buchananii. Phytochemistry 34(3): 665–667.
• Tsujino, Y., Ogoche, I.J., Tazaki, H., Fujimori, T. & Mori, K., 1995. Buchaninoside, a steroidal glycoside from Elaeodendron buchananii. Phytochemistry 40(3): 753–756.
• van Wyk, B. & van Wyk, P., 1997. Field guide to trees of southern Africa. Struik Publishers, Cape Town, South Africa. 536 pp.
Author(s)
R.H.M.J. Lemmens
PROTA Network Office Europe, Wageningen University, P.O. Box 341, 6700 AH Wageningen, Netherlands


Editors
R.H.M.J. Lemmens
PROTA Network Office Europe, Wageningen University, P.O. Box 341, 6700 AH Wageningen, Netherlands
D. Louppe
CIRAD, Département Environnements et Sociétés, Cirad es-dir, Campus international de Baillarguet, TA C-DIR / B (Bât. C, Bur. 113), 34398 Montpellier Cedex 5, France
A.A. Oteng-Amoako
Forestry Research Institute of Ghana (FORIG), University P.O. Box 63, KNUST, Kumasi, Ghana
Associate editors
E.A. Obeng
Forestry Research Institute of Ghana (FORIG), University P.O. Box 63, KNUST, Kumasi, Ghana

Correct citation of this article:
Lemmens, R.H.M.J., 2010. Elaeodendron buchananii (Loes.) Loes. In: Lemmens, R.H.M.J., Louppe, D. & Oteng-Amoako, A.A. (Editors). Prota 7(2): Timbers/Bois d’œuvre 2. [CD-Rom]. PROTA, Wageningen, Netherlands.