Commercial Timbers


H. G. Richter and M. J. Dallwitz

Piptadenia macrocarpa Benth. (Kurupa'y kuru)

Nomenclature etc. FABACEAE-MIMOSOIDEAE. Syn.: Anadenanthera macrocarpa (Benth.) Brenae. Trade and local names: kurupa'y, kurupa'y kuru (PY); angico-preto, angico, angico-preto-rajado, angico-rajado, guarapiraca (BR); cebil colorado, cebil moro, cebil (AR). Not protected under CITES regulations.

Description based on 3 specimens. Tree. Geographic distribution: tropical South America, southern Brazil, and temperate South America.

General. Growth ring boundaries distinct and indistinct or absent. Growth ring boundaries, if microscopically recognizable, demarcated by fine and often discontinuous marginal parenchyma bands (uniseriate and often crystalliferous) and a band of thick-walled fibres. Heartwood basically brown red yellow, with streaks. Odour indistinct or absent. Density 1.05 g/cm³.

Vessels. Vessels present. Wood diffuse-porous. Vessels arranged in no specific pattern, in multiples, commonly short (2–3 vessels) radial rows. Vessel outline rounded. Two distinct vessel diameter classes absent. Average tangential vessel diameter 40–110 µm; diameter of vessel lumina: small, medium, and large. Average number of vessels/mm² 12–30; vessels per square millimetre few and moderately numerous. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 5–7 µm, small, 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, light brown to orange coloured organic deposits.

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

Axial parenchyma. Axial parenchyma present, banded. Axial parenchyma bands marginal (or seemingly marginal), fine, up to three cells wide. Axial parenchyma apotracheal and paratracheal. Apotracheal axial parenchyma diffuse. Paratracheal axial parenchyma vasicentric and confluent. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 3–5. Unlignified parenchyma absent. Apotracheal parenchyma often with many prismatic crystals.

Rays. Rays present, 6–8 per tangential mm, multiseriate (also if only few), (1–)3–5 cells wide, of medium width (3–5 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 absent.

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 ray cells and axial parenchyma cells. Crystal-containing ray cells procumbent, upright and/or square ray cells not chambered. Crystals in procumbent ray cells not in radial alignment. 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.

Illustrations. • Transverse section. Piptadenia macrocarpa. • Tangential section. Piptadenia macrocarpa. • Radial section. Piptadenia macrocarpa.

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.’.