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Nomenclature etc. CELASTRACEAE. Trade and local names: bajan (MY-SWK); perupok kuning (MY-SAB); sepalis (ID); laying (PH). Not protected under CITES regulations.
Description based on 1 specimen. Tree. Geographic distribution: Myanmar (Burma), Thailand, Laos, Vietnam, Cambodia, Indomalesia.
General. Growth ring boundaries distinct. Marked by few rows of radially flattened latewood fibres. Heartwood basically brown (yellowish to pinkish brown). Sapwood colour similar to heartwood colour, or distinct from heartwood colour. Density (0.84–)0.9–1.07(–1.12) g/cm³.
Vessels. Wood diffuse porous. Vessels arranged in no specific pattern, exclusively solitary. Average tangential vessel diameter 55–70 µm. Average number of vessels/mm² 16–27. Perforation plates simple. Vessel-ray pits with distinct borders. Helical thickenings absent. Brown to reddish deposits in vessels.
Tracheids and fibres. Vascular or vasicentric tracheids commonly present. Fibres very thick-walled. Fibre pits common in both radial and tangential walls, distinctly bordered. Fibres non-septate.
Axial parenchyma. Axial parenchyma banded. Bands not marginal (or seemingly marginal). Axial parenchyma bands much wider than rays. Bands coarse. Sometimes short parenchyma bands present. Axial parenchyma as strands.
Rays. Rays 10–15 per tangential mm, multiseriate, 1–2 cells wide. Rays with multiseriate portions as wide as uniseriate portions present, or absent (rays often uniseriate with biseriate central parts). Aggregate rays absent. Height of large rays up to 500 µm. Rays composed of a single cell type (homocellular); homocellular ray cells procumbent.
Mineral inclusions. Crystals present, prismatic, located in ray cells and axial parenchyma cells. Crystal-containing ray cells upright and/or square and procumbent, upright and/or square ray cells chambered and not chambered. Crystal-containing axial parenchyma cells chambered and not chambered. Number of crystals per cell or chamber one. Maximum of two chambers per parenchyma cell. Silica not observed.
Physical and chemical tests. Heartwood not fluorescent. Water extract not fluorescent; colour of water extract colourless to brown. Ethanol extract not fluorescent. Colour of ethanol extract colourless to brown. Chrome azurol-S test positive. Splinter burns to partial ash. Ash bright white.
Illustrations. • Transverse section. • Tangential section. • Radial section.
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’.
