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| Commercial timbers |
Nomenclature etc. FABACEAE-FABOIDEAE. Trade and local names: jacarandá do Pará, saboarana (BR). Not protected under CITES regulations.
Tree. Geographic distribution: tropical South America (Amazon basin (Brazil, Peru), south to Bolivia).
General. Growth ring boundaries indistinct or absent. Heartwood basically brown, red, purple; with streaks (dark brown to black). Sapwood colour distinct from heartwood colour. Odour indistinct or absent. Density 0.85–1.11 g/cm³.
Vessels. Wood diffuse porous. Vessels in multiples, commonly in short (2–3 vessels) radial rows (rarely 4 or more). Two distinct vessel diameter classes absent. Average tangential vessel diameter 115–215–390 µm. Average number of vessels/mm² 1–9. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 7–10 µm, pits vestured. Vessel-ray pits with distinct borders, similar to intervessel pits. Other deposits present (both amber and dark brown).
Tracheids and fibres. Fibres very thick-walled. Fibre pits mainly restricted to radial walls, simple to minutely bordered.
Axial parenchyma. Axial parenchyma banded. Bands marginal (or seemingly marginal). Bands fine. Axial parenchyma apotracheal and paratracheal. Apotracheal axial parenchyma diffuse-in-aggregates. Paratracheal axial parenchyma vasicentric, aliform, and unilateral. Aliform parenchyma of the winged type. Axial parenchyma fusiform and as strands. Average number of cells per strand: 2(–4).
Rays. Rays 9–12 per tangential mm, multiseriate, (1–)2–3 cells wide. Height of large rays up to 500 µm. Rays composed of two or more cell types (heterocellular). Heterocellular rays with square and upright cells restricted to marginal rows, mostly 1 marginal row of upright or square cells.
Storied structures. Storied structure present, all rays storied, axial parenchyma storied, vessel elements storied, fibres storied. Number of ray tiers per axial millimetre 4–5.
Secretory structures. Intercellular canals absent.
Mineral inclusions. Crystals present or not observed, prismatic, located in axial parenchyma cells (rare). Crystal-containing axial parenchyma cells chambered. Number of crystals per cell or chamber one. Silica not observed.
Physical and chemical tests. Heartwood not fluorescent. Water extract fluorescent (blue); colour of water extract colourless to brown, or yellow. Ethanol extract fluorescent (blue). Colour of ethanol extract colourless to brown, or yellow. Splinter burns to charcoal.
Illustrations. • Macroscopic images. transverse (ca. 10x). radial (natural size). • Transverse section. • Tangential section. rays may be uniseriate or biseriate in different specimens. • Radial section.
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: 9th April 2019. delta-intkey.com’.
