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Nomenclature etc. LYTHRACEAE (SONNERATIACEAE). Incl. Duabanga grandiflora (Roxb. ex DC.) Walp (syn.: D. sonneratioides Buch.-Ham.). Trade and local names: binuang, benuang, b. laki, gayawas hutan, kalanggo (ID); magasawih, berembang bukit, magas (MY); loktob (PH); myaukngo (MM); dlom chloeu ter (KH); phay (LA); lamphu-pa, tum-ten, lamphaen (TH). Not protected under CITES regulations.
Tree. Geographic distribution: Myanmar (Burma), Thailand, Laos, Vietnam, Cambodia, Indomalesia.
General. Heartwood basically white or grey. Sapwood colour similar to heartwood colour. Density 0.25–0.52 g/cm³.
Vessels. Vessels present. Wood diffuse porous. Vessels arranged in no specific pattern, in multiples, commonly in short (2–3 vessels) radial rows. Average tangential vessel diameter 160–250(–350) µm. Average number of vessels/mm² 2–7. Average vessel element length 700–800 µm. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 8–12 µm, pits vestured. Vessel-ray pits with reduced borders or apparently simple, rounded or angular or horizontal to vertical, of the same type in adjacent elements or unilaterally compound and coarse. Helical thickenings absent. Tyloses present, thinwalled. Other deposits not observed.
Tracheids and fibres. Vascular or vasicentric tracheids sporadic to absent. Fibres very thin-walled, or of medium wall thickness. Average fibre length 1200–1400(–2300) µm. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Fibres non-septate.
Axial parenchyma. Axial parenchyma not banded. Axial parenchyma apotracheal, or paratracheal. Apotracheal axial parenchyma diffuse-in-aggregates. Paratracheal axial parenchyma scanty, or vasicentric. Axial parenchyma as strands. Average number of cells per strand: 3–7.
Rays. Rays 8–10 per tangential mm, exclusively uniseriate or multiseriate, 1(–2) cells wide. Height of large rays up to 500 µm. Rays composed of a single cell type (homocellular), or two or more cell types (heterocellular); homocellular ray cells procumbent. Heterocellular rays with square and upright cells restricted to marginal rows, mostly 1 marginal row of upright or square cells.
Storied structures. Storied structure absent.
Secretory structures. Intercellular canals absent. Laticifers or tanniniferous tubes absent.
Cambial variants. Included phloem absent.
Mineral inclusions. Crystals present, prismatic and styloids or elongate, located in ray cells or axial parenchyma cells. Crystal-containing ray cells upright and/or square. Crystal-containing axial parenchyma cells not chambered. Number of crystals per cell or chamber one, or more than one. Crystals in one cell or chamber of two distinct sizes. Silica not observed.
Illustrations. • Transverse section. • Tangential section. • Radial section. crystals in axial parenchyma (for blow-up see next picture). • Crystals. Duabanga moluccana. prismatic crystals of different size and variable number per cell in axial parenchyma.
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’.
