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H. G. Richter and M. J. Dallwitz

Dalbergia madagascariensis Vatke (Madagascar rosewood)

Nomenclature etc. FABACEAE-FABOIDEAE. Not protected under CITES regulations.

Description based on 6 specimens. Tree. Geographic distribution: Madagascar & other islands.

General. Growth ring boundaries indistinct or absent. Heartwood basically brown and yellow, with streaks. Sapwood colour distinct from heartwood colour. Odour distinct.

Vessels. Vessels present. Wood diffuse-porous. Vessels arranged in no specific pattern, in multiples, commonly short (2–3 vessels) radial rows and in clusters. Vessel outline rounded. Two distinct vessel diameter classes absent. Average tangential vessel diameter 90–280–550 µm; diameter of vessel lumina: very large. Average number of vessels/mm² 2–5; vessels per square millimetre very few. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 10–13 µm, large, vestured. Vessel-ray pits with distinct borders, similar to intervessel pits, of uniform size or type, of the same type in adjacent elements, located throughout the ray. Helical thickenings absent. Tyloses in vessels absent. Other deposits in heartwood vessels present, vessels with amber or brown contents.

Tracheids and fibres. Vascular or vasicentric tracheids sporadic to absent. Fibres of medium wall thickness to very thick-walled. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Helical thickenings absent. Fibres non-septate. Yellow to brown organic organic deposits in fibres, of irregular distribution.

Axial parenchyma. Axial parenchyma present, banded. Axial parenchyma bands not marginal (or seemingly marginal), bands much wider than rays, fine, up to three cells wide and coarse, more than three cells wide. Parenchyma bands variable in width from 2 to 20 cells. Axial parenchyma paratracheal. Paratracheal axial parenchyma vasicentric and aliform. Aliform parenchyma lozenge. Axial parenchyma fusiform. Fusiform cells often subdivided (2 cells).

Rays. Rays present, 7–11 per tangential mm, multiseriate (also if only few), 1–2 cells wide, narrow (2–3 seriate). Rays with multiseriate portions as wide as uniseriate portions absent. Aggregate rays absent. Rays of one size. Height of large rays up to 500 µm. Rays composed of a single cell type (homocellular); homocellular ray cells procumbent. Sheath cells absent. Tile cells absent. Perforated ray cells absent. Disjunctive ray parenchyma end walls indistinct or absent.

Storied structures. Storied structure present, all rays storied, axial parenchyma storied, vessel elements storied, fibres storied. Arrangement of tiers regular (horizontal or straight). Number of ray tiers per axial millimetre 4–6.

Secretory structures. Oil and mucilage cells absent. Intercellular canals absent. Laticifers or tanniniferous tubes absent.

Cambial variants. Included phloem absent. Other cambial variants absent.

Mineral inclusions. Crystals present, prismatic, located in axial parenchyma cells. Crystal-containing axial parenchyma cells chambered. Number of crystals per cell or chamber one. Crystal containing cells of normal size. Cystoliths absent. Silica not observed.

Physical and chemical tests. Heartwood not fluorescent. Water extract fluorescent; basically colourless to brown or shade of brown. Heartwood extractives not leachable by water. Ethanol extract fluorescent. Colour of ethanol extract red or shade of red. Ethanol extract with greenish fluorescence. Chrome azurol-S test negative. Froth test negative. Splinter burns to partial ash. Ash bright white.

Illustrations. • Macro images. Dalbergia madagascariensis. Transverse. Tangential. • Transverse section. Dalbergia madagascariensis. • Tangential section. Dalbergia madagascariensis. • Radial section. Dalbergia madagascariensis.


The interactive key allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting specified attributes, summaries of attributes within groups of taxa, and geographical distribution.

Cite this publication as: ‘Richter, H.G., and Dallwitz, M.J. 2000 onwards. Commercial timbers: descriptions, illustrations, identification, and information retrieval. In English, French, German, Portuguese, and Spanish. Version: 25th June 2009. http://delta-intkey.com’.

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