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Pellegriniodendron diphyllum (Harms) J.Léonard

Protologue
Bull. Jard. Bot. Etat 25(2): 203 (1955).
Family
Caesalpiniaceae (Leguminosae - Caesalpinioideae)
Synonyms
Macrolobium diphyllum Harms (1901).
Vernacular names
Faux copalier (Fr).
Origin and geographic distribution
Pellegriniodendron diphyllum occurs in Liberia, Côte d’Ivoire, Ghana, Cameroon, Equatorial Guinea and Gabon.
Uses
In Ghana the wood is used for door frames and in Gabon for joinery. It is suitable for cabinet work.
Properties
The heartwood is brown to reddish brown, often marbled. The texture is moderately fine. The wood is quite heavy and hard.
Botany
Small to medium-sized tree up to 25 m tall; bole often low branching, up to at least 30 cm in diameter, often with adventitious shoots at base; bark surface smooth, finely fissured, with lenticels, greyish brown, inner bark fibrous, reddish; crown rounded, with drooping branches. Leaves alternate, paripinnately compound with 1 pair of leaflets; stipules triangular, c. 3 mm long; petiole 3–5 mm long; petiolules 2–3 mm long, with short stipels at base; leaflets elliptical to oblong or obovate, 10–24 cm × 3–10 cm, asymmetrical at base, short-acuminate at apex with acumen often contorted or rolled up, leathery, glabrous, with some glands near margins, pinnately veined with c. 10 pairs of lateral veins. Inflorescence a terminal, drooping panicle up to 10 cm long, with raceme-like, densely flowered side branches 2–3 cm long, with conspicuous scars of fallen flowers and bracts, usually glabrous. Flowers bisexual, zygomorphic, with 2 pinkish bracteoles up to 1 cm long at base; pedicel 6–8 mm long; sepals 5, lanceolate, 3–4.5 mm long, slightly fused at base; petals 5, free, unequal, upper one up to 1.5 cm long, 2-lobed, whitish, other ones resembling the sepals; stamens 3, free, 1–2 cm long, reddish, with a collar of small rudimentary stamens at base; ovary superior, oblong, hairy at margins, 1-celled, style c. 1.5 cm long. Fruit an elliptical to obovoid, flattened pod c. 10 cm × 4 cm, pointed at apex, smooth, glabrous, reddish brown, dehiscing with 2 spiralling thinly woody valves, 1–3-seeded. Seeds rectangular to elliptical, flattened, up to 3 cm × 2 cm, glossy brown, seed coat thin. Seedling with epigeal germination; hypocotyl 1.5–4 cm long, epicotyl 3.5–7 cm long; cotyledons thick and fleshy, rectangular-elliptical, 2–2.5 cm long; first 2 leaves strongly reduced to opposite scales, subsequent leaves alternate, with 1 pair of leaflets.
Young leaves are often bright pink. In West Africa Pellegriniodendron diphyllum flowers in September–December and fruits mature about 5 months after flowering. The presence of ectomycorrhizae has been recorded.
Pellegriniodendron comprises a single species and seems to be related to Gilbertiodendron.
Ecology
Pellegriniodendron diphyllum usually occurs in the understorey of lowland rainforest, often on humid localities along streams and in moist gullies.
Management
Natural regeneration is often abundant, and the seedlings are shade tolerant. Germination starts 1.5–4 weeks after sowing, with a germination rate of 70–80%. Mature trees are often found in small, dense groups.
Genetic resources and breeding
Pellegriniodendron diphyllum is not threatened because it is fairly widespread and locally common with abundant regeneration. However, in Ghana it has been rated as a gold star species, meaning that there is some inescapable responsibility for maintaining this species because it has a very restricted distribution in Ghana.
Prospects
Pellegriniodendron diphyllum will remain of little importance as a timber tree because the logs are usually too small and too poorly shaped.
Major references
• Aubréville, A., 1959. La flore forestière de la Côte d’Ivoire. Deuxième édition révisée. Tome premier. Publication No 15. Centre Technique Forestier Tropical, Nogent-sur-Marne, France. 369 pp.
• Aubréville, A., 1970. Légumineuses - Césalpinioidées (Leguminosae - Caesalpinioideae). Flore du Cameroun. Volume 9. Muséum National d’Histoire Naturelle, Paris, France. 339 pp.
• de Koning, J., 1983. La forêt de Banco. Part 2: La Flore. Mededelingen Landbouwhogeschool Wageningen 83–1. Wageningen, Netherlands. 921 pp.
• Irvine, F.R., 1961. Woody plants of Ghana, with special reference to their uses. Oxford University Press, London, United Kingdom. 868 pp.
• Raponda-Walker, A. & Sillans, R., 1961. Les plantes utiles du Gabon. Paul Lechevalier, Paris, France. 614 pp.
Other references
• Aubréville, A., 1968. Légumineuses - Caesalpinioidées (Leguminosae - Caesalpinioideae). Flore du Gabon. Volume 15. Muséum National d’Histoire Naturelle, Paris, France. 362 pp.
• 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.
• Diabate, M., Munive, A., Miana de Faria, S., Ba, A., Dreyfus, B. & Galiana, A., 2005. Occurrence of nodulation in unexplored leguminous trees native to the West African tropical rainforest and inoculation response of native species useful in reforestation. New Phytologist 166(1): 231–239.
• Hawthorne, W.D., 1995. Ecological profiles of Ghanaian forest trees. Tropical Forestry Papers 29. Oxford Forestry Institute, Department of Plant Sciences, University of Oxford, United Kingdom. 345 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.
• 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.
• Voorhoeve, A.G., 1979. Liberian high forest trees. A systematic botanical study of the 75 most important or frequent high forest trees, with reference to numerous related species. Agricultural Research Reports 652, 2nd Impression. Centre for Agricultural Publishing and Documentation, Wageningen, Netherlands. 416 pp.
• White, L. & Abernethy, K., 1997. A guide to the vegetation of the Lopé Reserve, Gabon. 2nd edition. Wildlife Conservation Society, New York, United States. 224 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
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. Pellegriniodendron diphyllum (Harms) J.Léonard. 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.
Pellegriniodendron diphyllum


Pellegriniodendron diphyllum