Commercial Timbers


H. G. Richter and M. J. Dallwitz

Dicorynia guianensis Amsh., D. paraensis Benth. (Angélique, basralocus)

Nomenclature etc. FABACEAE-CAESALPINIOIDEAE. Trade and local names: angelique (DE, FR, GF), basralocus, zandlocus, kabakally, singapetou (SR), angelica do Para, tapaiuna (BR); "tec" de la Guayana, Guayana "Teak" (trade). Not protected under CITES regulations.

Tree. Geographic distribution: tropical South America.

General. Heartwood basically brown. Sapwood colour distinct from heartwood colour. Density 0.6–0.72 g/cm³. With interlocked grain.

Vessels. Wood diffuse-porous. Vessels arranged in no specific pattern, in multiples, commonly short (2–3 vessels) radial rows (occasionally with some longer radial chains and small clusters). Two distinct vessel diameter classes absent. Average tangential vessel diameter 185–245–295 µm. Average number of vessels/mm² 2–5. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 5–7 µm, vestured. Vessel-ray pits with distinct borders, similar to intervessel pits. Helical thickenings absent. Other deposits in heartwood vessels present (light to dark reddish brown).

Tracheids and fibres. Fibres of medium wall thickness. Average fibre length 1230–1625–2040 µm. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Fibres non-septate. Fibres often with dark coloured contents.

Axial parenchyma. Axial parenchyma banded and not banded. Axial parenchyma bands marginal (or seemingly marginal), fine, up to three cells wide or coarse, more than three cells wide. Axial parenchyma paratracheal (rarely apotracheal). Paratracheal axial parenchyma vasicentric, aliform, confluent, and unilateral (predominantly aliform confluent). Aliform parenchyma winged. Axial parenchyma as strands. Average number of cells per axial parenchyma strand (2–)4–8(–10).

Rays. Rays 6–12 per tangential mm, multiseriate (also if only few), 1–2–3 cells wide. 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 (rarely 2 rows). Sheath cells absent.

Storied structures. Storied structure present (not always distinct), all rays storied, axial parenchyma storied, vessel elements storied. Arrangement of tiers regular (horizontal or straight). Number of ray tiers per axial millimetre 2. Storied strata often slightly inclined.

Secretory structures. Intercellular canals absent.

Mineral inclusions. Crystals not observed. Silica present, as grains, in rays cells and in axial parenchyma.

Physical and chemical tests. Splinter burns to charcoal.

Illustrations. • Macro images. Dicorynia guianensis. Transverse. Radial. • Transverse section. Dicorynia guianensis. • Tangential section. Dicorynia guianensis. • Radial section. Dicorynia guianensis.

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.’.