PROTA homepage Prota 7(1): Timbers/Bois d’œuvre 1
Record display


Sakoanala madagascariensis R.Vig.

Protologue
Notul. Syst. (Paris) 14(3): 186 (1951).
Family
Papilionaceae (Leguminosae - Papilionoideae, Fabaceae)
Origin and geographic distribution
Sakoanala madagascariensis is endemic to eastern Madagascar, where it is restricted to the coastal zone around Toamasina.
Uses
The wood is highly valued for house construction.
Properties
The wood is yellowish, with a fine texture. It can be polished well.
Botany
Deciduous small to medium-sized tree up to 15 m tall; bole up to 50 cm in diameter; bark bronzed brown, smooth, with greyish surface cracks; twigs thick and succulent, shortly hairy when young. Leaves alternate, imparipinnate with 9–13 leaflets; petiole and rachis channelled, sparsely shortly hairy; leaflets opposite to slightly alternate, oblong-elliptical to ovate, (2.5–) 3–7.5 cm × (1–)1.5–3.5 cm, rounded to truncate at base, obtuse to shortly acuminate at apex, thinly leathery, glabrous except for the midrib and margins. Inflorescence a rather lax raceme 5–23 cm long, many-flowered. Flowers bisexual, papilionaceous; pedicel with small bract near the middle; calyx broadly cup-shaped, 5–7 mm long, with rounded lobes; corolla violet, with circular standard c. 2 cm in diameter, long-clawed at base, notched at apex, wings and keel oblong, shorter than standard; stamens 10 or 11, free; ovary superior, shortly stalked, glabrous, 1-celled, style slightly upcurved, stigma indistinct. Fruit an oblong pod (4–)6–14 cm × 1.5–3 cm, flattened, with slightly wing-like margins, glabrous, indehiscent, (1–)3–5-seeded. Seeds kidney-shaped, c. 7 mm long, flattened, chestnut-brown.
Sakoanala comprises 2 species, both restricted to Madagascar. The genus is related to Neoharmsia, which differs in the usually smaller number of leaflets per leaf, campanulate calyx and dehiscent pods.
Sakoanala madagascariensis is tardily deciduous. It usually flowers on leafless shoots just after the leaves have fallen. It is reported to fix atmospheric nitrogen.
Ecology
Sakoanala madagascariensis occurs in humid coastal forest on sandy soils.
Genetic resources and breeding
Sakoanala madagascariensis is classified as endangered in the 2006 IUCN Red list of threatened species. It is selectively felled for timber and the remaining fragments of coastal forest in its small distribution area are still declining.
Prospects
Protection of this threatened species is badly needed and harvesting should be stopped immediately to prevent its extinction.
Major references
• du Puy, D.J., Labat, J.N., Rabevohitra, R., Villiers, J.-F., Bosser, J. & Moat, J., 2002. The Leguminosae of Madagascar. Royal Botanic Gardens, Kew, Richmond, United Kingdom. 750 pp.
Other references
• du Puy, D. & Labat, H., 1998. Sakoanala madagascariensis. In: IUCN. 2006 Red list of threatened species. [Internet] http://www.iucnredlist.org. Accessed October 2006.
• Peltier, M., 1972. Les Sophorées de Madagascar. Adansonia, séries 2, 12(1): 137–154.
• Schatz, G.E., 2001. Generic tree flora of Madagascar. Royal Botanic Gardens, Kew, Richmond, United Kingdom. 477 pp.
Author(s)
R.H.M.J. Lemmens
PROTA Network Office Europe, Wageningen University, P.O. Box 341, 6700 AH Wageningen, Netherlands


Editors
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
M. Brink
PROTA Network Office Europe, Wageningen University, P.O. Box 341, 6700 AH Wageningen, Netherlands
General editors
R.H.M.J. Lemmens
PROTA Network Office Europe, Wageningen University, P.O. Box 341, 6700 AH Wageningen, Netherlands
L.P.A. Oyen
PROTA Network Office Europe, Wageningen University, P.O. Box 341, 6700 AH Wageningen, Netherlands
J.R. Cobbinah
Forestry Research Institute of Ghana (FORIG), University P.O. Box 63, KNUST, Kumasi, Ghana

Correct citation of this article:
Lemmens, R.H.M.J., 2007. Sakoanala madagascariensis R.Vig. In: Louppe, D., Oteng-Amoako, A.A. & Brink, M. (Editors). Prota 7(1): Timbers/Bois d’œuvre 1. [CD-Rom]. PROTA, Wageningen, Netherlands.