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Nomenclature etc. APOCYNACEAE. Trade and local names: ubirá-ro-puütá (AR); cacha, quichua, chiriguano, guarirová, yviraró (BO); kebrako (?); white quebracho (GB, US); cachá, ebédu, yvira ji'y morotí (PY); quebracho branco, quina (BR);. Not protected under CITES regulations.
Description based on 3 specimens. Tree. Geographic distribution: tropical South America, southern Brazil, temperate South America.
General. Growth ring boundaries distinct (sometimes indicated by semi porosity and noded rays). Heartwood basically yellow (with a pinkish tinge). Sapwood colour similar to heartwood colour. Density 0.85 g/cm³.
Vessels. Wood diffuse porous. Vessels arranged in no specific pattern, exclusively solitary. Average tangential vessel diameter 80–160–240 µm. Average number of vessels/mm² 10–20. Average vessel element length 93–253–434 µm. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 4–6 µm. Intervessel pits restricted to overlapping vessel tails and tracheids. Vessel-ray pits with distinct borders, similar to intervessel pits. Helical thickenings absent. Tyloses absent.
Tracheids and fibres. Vascular or vasicentric tracheids commonly present. Fibres of medium wall thickness to very thick-walled. Average fibre length 900–1200 µm. Fibre pits common in both radial and tangential walls, distinctly bordered. Fibres non-septate.
Axial parenchyma. Apotracheal axial parenchyma diffuse, or diffuse-in-aggregates. Axial parenchyma as strands. Average number of cells per strand: (2–)3–5.
Rays. Rays 8–10 per tangential mm, multiseriate, 3–5 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 absent.
Mineral inclusions. Crystals present, prismatic, located in ray cells. Crystal-containing ray cells procumbent. Crystals in procumbent ray cells in radial alignment. Number of crystals per cell or chamber one. Silica not observed.
Illustrations. • Transverse section. • Tangential section. • Radial section. • Vessel-ray pits. vessel-ray pits typically bordered. • Vasicentric tracheids. presence of vasicentric tracheids. • Crystals. large prismatic crystals in rays, frequently in radial series (semi-polarised light).
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’.
