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H. G. Richter and M. J. Dallwitz

Piptadenia rigida Benth. (Kurupa'y ra)

Nomenclature etc. FABACEAE-MIMOSOIDEAE. Syn.: Parapiptadenia rigida (Benth.) Brenae. Trade and local names: kurupa'y ra (PY); angico-vermelho, angico-cedro, angico-rosa, angico-de-cortume (BR); anchico colorado, anchico, angico, curupa'y ra (AR). Not protected under CITES regulations.

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

General. Growth ring boundaries distinct. Growth ring boundaries are demarcated microscopically by fine marginal parenchyma bands (often with many crystals) and by tending towards 'semi-ringporous'. Heartwood basically brown yellow red, without streaks. Sapwood colour distinct from heartwood colour. Odour indistinct or absent. Density 0.85 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. Occasionally in radial groups up to 6. Average tangential vessel diameter 60–200 µm; diameter of vessel lumina: medium and large. Average number of vessels/mm² 8–14; vessels per square millimetre few. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 5–7 µm, small, vestured. Vessel-ray pits with distinct borders and with reduced borders or apparently simple, similar to intervessel pits, horizontal to vertical, 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, with reddish brown organic deposits.

Tracheids and fibres. Vascular or vasicentric tracheids sporadic to absent. Fibres very thin-walled and of medium wall thickness. 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, aliform, and confluent. Aliform parenchyma lozenge. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 2–3(–4). Unlignified parenchyma absent.

Rays. Rays present, 6–10 per tangential mm, multiseriate (also if only few), (1–)2(–3) cells wide, narrow (2–3 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 axial parenchyma cells. 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.

Physical and chemical tests. Heartwood not fluorescent. Water extract not fluorescent; basically colourless to brown or shade of brown. Heartwood extractives not leachable by water. Ethanol extract fluorescent. Colour of ethanol extract red or shade of red (light brick red). Chrome azurol-S test negative. Froth test positive. Splinter burns to partial ash. Ash white to grey.

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


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. http://delta-intkey.com’.

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