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Mildbraediodendron excelsum Harms

Protologue
Mildbr., Wiss. Erg. Deut. Zentr.-Afr. Exped., Bot. 3: 241, pl. 27 (1911).
Family
Caesalpiniaceae (Leguminosae - Caesalpinioideae)
Origin and geographic distribution
Mildbraediodendron excelsum is widespread from Ghana east to DR Congo, southern Sudan and western Uganda.
Uses
The wood, known as ‘muyati’ in Uganda, is used for heavy construction, flooring and railway sleepers, and also as firewood and for charcoal production. Mildbraediodendron excelsum is occasionally planted as a shade tree in coffee, cocoa and banana plantations, and as an ornamental tree.
Properties
The heartwood is whitish yellow to pinkish, turning pale brown to ochrous brown upon exposure, with attractive paler markings; it is clearly demarcated from the sapwood. The texture is moderately coarse. The wood is heavy. It is difficult to nail and has a tendency of splitting. It is durable.
Mildbraedin, a kaempferol tetraglycoside, has been isolated from an aqueous methanol extract of leaves.
Botany
Deciduous, medium-sized to large tree up to 50 m tall; bole branchless for up to 20 m, straight or slightly sinuous, cylindrical, up to 90 cm in diameter, with triangular buttresses up to 3 m high; bark surface scaly with rectangular scales or slightly longitudinally fissured, grey-brown, inner bark thick, fibrous, whitish to pinkish or pale orange, slightly streaked, with whitish exudate; crown large, with spreading branches; twigs sparsely short-hairy to glabrous. Leaves alternate, imparipinnately compound with 12–19 pairs of leaflets; stipules small, caducous; petiole and rachis together 25–45 cm long, grooved; petiolules 3–4 mm long, hairy; leaflets alternate to opposite, ovate-oblong to lanceolate-oblong, 2–8 cm × 1–2.5 cm, rounded at base, obtuse at apex, sparsely short-hairy, with numerous translucent dots, pinnately veined. Inflorescence a lateral raceme on young branches below the leaves, 1–7 cm long, short-hairy. Flowers bisexual or unisexual, yellowish green, with linear, caducous bracteoles at base; pedicel 0.5–1 cm long; calyx globular, 5–7 mm in diameter, splitting into (2–)3 lobes upon opening of the flower; petals absent; stamens 12–18, slightly fused at base; disk flattened, c. 3.5 mm in diameter; ovary superior, with long stipe, 1-celled, style awl-shaped. Fruit a globose pod 4–10 cm in diameter, greenish, indehiscent, with 1–3(–5) seeds embedded in soft, yellowish pulp. Seeds ellipsoid, 4–7 cm long, brown.
Mildbraediodendron excelsum trees grow slowly. The fruits are commonly eaten by elephants, which disperse the seeds. Leaves and fruits are eaten by chimpanzees.
Mildbraediodendron comprises a single species. In recent classifications it is usually placed in the tribes Swartzieae or Sophoreae of the family Papilionaceae (Leguminosae - Papilionoideae), and it is related to Aldina from tropical America and Cordyla from mainland Africa and Madagascar. Its flowers, lacking petals and with more than 10 stamens, do not have the characteristic papilionaceous structure, and therefore Mildbraediodendron was until recently usually classified within Caesalpiniaceae.
Ecology
Mildbraediodendron excelsum occurs in lowland rainforest up to 1000 m altitude. In Cameroon it occurs mainly in semi-deciduous forest.
Management
To obtain seed for propagation, ripe fruits should be collected and seeds extracted and gradually dried. The seeds can be stored for some time in a cool and dry place, but they are susceptible to insect attack; it is recommended to mix the seeds with ash. Wildlings are sometimes also collected for planting. In Uganda Mildbraediodendron excelsum has been planted in mixed plantations with Entandrophragma spp. and Maesopsis eminii Engl. The tree can be managed by lopping and pollarding.
Genetic resources and breeding
Although Mildbraediodendron excelsum is quite widespread, it is in part of its distribution area rare, especially in West Africa.
Prospects
It has been suggested more than once that Mildbraediodendron excelsum is a timber tree of potential commercial importance. This is certainly the case where it occurs abundantly, but for sustainable exploitation the low growth rate should be taken into consideration.
Major references
• Aubréville, A., 1970. Légumineuses - Césalpinioidées (Leguminosae - Caesalpinioideae). Flore du Cameroun. Volume 9. Muséum National d’Histoire Naturelle, Paris, France. 339 pp.
• Brenan, J.P.M., 1967. Leguminosae, subfamily Caesalpinioideae. In: Milne-Redhead, E. & Polhill, R.M. (Editors). Flora of Tropical East Africa. Crown Agents for Oversea Governments and Administrations, London, United Kingdom. 230 pp.
• Eggeling, W.J. & Dale, I.R., 1951. The indigenous trees of the Uganda Protectorate. Government Printer, Entebbe, Uganda. 491 pp.
• Katende, A.B., Birnie, A. & Tengnäs, B., 1995. Useful trees and shrubs for Uganda: identification, propagation and management for agricultural and pastoral communities. Technical Handbook 10. Regional Soil Conservation Unit, Nairobi, Kenya. 710 pp.
• Vivien, J. & Faure, J.J., 1985. Arbres des forêts denses d’Afrique Centrale. Agence de Coopération Culturelle et Technique, Paris, France. 565 pp.
Other references
• Burkill, H.M., 1995. The useful plants of West Tropical Africa. 2nd Edition. Volume 3, Families J–L. Royal Botanic Gardens, Kew, Richmond, United Kingdom. 857 pp.
• Hawthorne, W. & Jongkind, C., 2006. Woody plants of western African forests: a guide to the forest trees, shrubs and lianes from Senegal to Ghana. Kew Publishing, Royal Botanic Gardens, Kew, United Kingdom. 1023 pp.
• Keay, R.W.J., 1989. Trees of Nigeria. A revised version of Nigerian trees (1960, 1964) by Keay, R.W.J., Onochie, C.F.A. & Stanfield, D.P. Clarendon Press, Oxford, United Kingdom. 476 pp.
• Lewis, G., Schrire, B., MacKinder, B. & Lock, M., 2005. Legumes of the world. Royal Botanic Gardens, Kew, Richmond, United Kingdom. 577 pp.
• Normand, D. & Paquis, J., 1976. Manuel d’identification des bois commerciaux. Tome 2. Afrique guinéo-congolaise. Centre Technique Forestier Tropical, Nogent-sur-Marne, France. 335 pp.
• Richter, H.G. & Dallwitz, M.J., 2000. Commercial timbers: descriptions, illustrations, identification, and information retrieval. [Internet]. Version 16th April 2006. http://delta-intkey.com/wood/index.htm. Accessed April 2009.
• Sommerlatte, H. & Sommerlatte, M., 1990. A field guide to the trees and shrubs of the Imatong Mountains, southern Sudan. Deutsche Gesellschaft fur Technische Zusammmenarbeit (GTZ), Nairobi, Kenya. 372 pp.
• Tailfer, Y., 1989. La forêt dense d’Afrique centrale. Identification pratique des principaux arbres. Tome 2. CTA, Wageningen, Pays Bas. pp. 465–1271.
• Veitch, N.C., Bristow, J.M., Kite, G.C. & Lewis, G.P., 2005. Mildbraedin, a novel kaempferol tetraglycoside from the tropical forest legume Mildbraediodendron excelsum. Tetrahedron Letters 46(49): 8595–8598.
• Wilczek, R., Léonard, J., Hauman, L., Hoyle, A.C., Steyaert, R., Gilbert, G. & Boutique, R., 1952. Caesalpiniaceae. In: Robyns, W., Staner, P., Demaret, F., Germain, R., Gilbert, G., Hauman, L., Homès, M., Jurion, F., Lebrun, J., Vanden Abeele, M. & Boutique, R. (Editors). Flore du Congo belge et du Ruanda-Urundi. Spermatophytes. Volume 3. Institut National pour l’Étude Agronomique du Congo belge, Brussels, Belgium. pp. 234–554.
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
Photo editor
G.H. Schmelzer
PROTA Network Office Europe, Wageningen University, P.O. Box 341, 6700 AH Wageningen, Netherlands

Correct citation of this article:
Lemmens, R.H.M.J., 2010. Mildbraediodendron excelsum Harms. 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.
wood in transverse section


wood in tangential section