Commercial Timbers


H. G. Richter and M. J. Dallwitz

Cedrelinga catenaeformis Ducke (Cedrorana, tornillo)

Nomenclature etc. FABACEAE-MIMOSOIDEAE. Trade and local names: cedrorana, iacaica, paric , yacayac (BR), tornillo (PE). Not protected under CITES regulations.

Tree. Geographic distribution: tropical South America.

General. Growth ring boundaries distinct. Growth ring limits demarcated by somewhat darker latewood zones. Heartwood basically white or grey to red to brown. Sapwood colour similar to heartwood colour, or distinct from heartwood colour. Density 0.4–0.48–0.64 g/cm³.

Vessels. Wood diffuse-porous. Vessels arranged in no specific pattern, in multiples, commonly short (2–3 vessels) radial rows. Average tangential vessel diameter 250–400(–500) µm. Average number of vessels/mm² 1–3. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 6–8 µm, vestured. Vessel-ray pits with distinct borders, similar to intervessel pits. Helical thickenings absent. Tyloses in vessels absent. Other deposits in heartwood vessels present (reddish brown).

Tracheids and fibres. Fibres very thin-walled, or of medium wall thickness. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Fibres non-septate.

Axial parenchyma. Axial parenchyma apotracheal, or paratracheal. Apotracheal axial parenchyma diffuse. Paratracheal axial parenchyma vasicentric. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 4–7. Diffuse parenchyma often consists of chambered cells/strands without any contents, a feature characteristic for this species.

Rays. Rays 9–12 per tangential mm, exclusively uniseriate or multiseriate (also if only few), 1–2 cells wide. Rays composed of a single cell type (homocellular); homocellular ray cells procumbent.

Storied structures. Storied structure present, all rays storied, axial parenchyma not storied. Arrangement of tiers irregular. Number of ray tiers per axial millimetre 3. Storeying of rays always irregular, in some specimens hardly discernible.

Secretory structures. Intercellular canals absent.

Mineral inclusions. Crystals not observed. Silica not observed.

Illustrations. • Macro images. Transverse. Radial. Cedrelinga catenaeformis. • Transverse section. Cedrelinga catenaeformis. • Tangential section. Cedrelinga catenaeformis. Blow-up of chambered cells without any contents (left margin). • Radial section. Cedrelinga catenaeformis. • Chambered cells. Cedrelinga catenaeformis. Note: Large number of chambered cells without any contents.

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.’.