Nomenclature etc. FABACEAE-CAESALPINIOIDEAE. Trade and local names: yvyrapyta (PY); canafístula (AR); guarucaia (BR). 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 demarcated by marginal parenchyma bands (1–2 seriate, sometimes discontinuous), few rows of radially flattened fibres, and slightly thickened (noded) rays. Heartwood basically brown and red, without streaks. Sapwood colour distinct from heartwood colour. Odour indistinct or absent. Density 0.8–0.9 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 80–240 µm; diameter of vessel lumina: medium, large, and very large. Average number of vessels/mm² 1–7; vessels per square millimetre very few and few. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 6–8 µm, small and medium, 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 not observed, brown to nearly black organic contents.
Tracheids and fibres. Vascular or vasicentric tracheids sporadic to absent. Fibres of medium wall thickness. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Helical thickenings absent. Fibres exclusively septate. Septate fibres evenly distributed.
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 2–4. Unlignified parenchyma absent. Apotracheal parenchyma scarce, generally crystalliferous.
Rays. Rays present, 5–11 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 red or shade of red. Heartwood extractives leaching out when in contact with water. Ethanol extract fluorescent. Colour of ethanol extract red or shade of red. Water extract with yellow fluorescence, ethanol extract with pinkish fluorescence. Chrome azurol-S test negative. Froth test positive (slightly). Splinter burns to partial ash. Ash white to grey.
Illustrations. • Transverse section. Peltophorum dubium. • Tangential section. Peltophorum dubium. • Radial section. Peltophorum dubium.
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’.