| | Commercial timbers |
Nomenclature etc. FABACEAE-MIMOSOIDEAE. Trade and local names: lacaica, paricá, yacayac (BR); chuncho, mara macho, seique, tsaik (EC); achapo (CO); huayra caspi (PE); don cede (GF). Not protected under CITES regulations.
Tree. Geographic distribution: tropical South America.
General. Growth ring boundaries distinct (demarcated by somewhat darker latewood zones). Heartwood basically brown, red; without streaks. Sapwood colour distinct from heartwood colour. Density 0.4–0.48–0.64 g/cm³.
Vessels. Wood diffuse porous. Vessels in multiples, commonly in 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, pits vestured. Vessel-ray pits with distinct borders, similar to intervessel pits. Helical thickenings absent. Other deposits present (reddish brown).
Tracheids and fibres. Fibres 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, or diffuse-in-aggregates. Paratracheal axial parenchyma vasicentric. Axial parenchyma as strands. Average number of cells per 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, multiseriate, 1–2 cells wide. Height of large rays up to 500 µm. 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.
Mineral inclusions. Crystals not observed. Silica not observed.
Physical and chemical tests. Froth test positive.
Illustrations. • Macroscopic images. transverse (ca. 10x). radial (natural size). • Transverse section. • Tangential section. chambered cells without any contents. • Radial section. chambered cells without any contents. • Chambered cells. 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: 9th April 2019. delta-intkey.com’.
