Nomenclature etc. FABACEAE-CAESALPINIOIDEAE. Trade and local names: movingui (CI, FR, NG, DE), ayan, anyaran (GB, NG), barré, guétalie, koa (CI), bonsamdua, duabai (GH), okpe (TG), bosong, eyen, sella (CM), muvenghi, eyen, ogueminya (GA); eyen, bien (GQ). Not protected under CITES regulations.
Tree. Geographic distribution: tropical Africa.
General. Growth ring boundaries distinct. Heartwood basically yellow to brown (yellow when green, darkening to yellowish brown). Sapwood colour distinct from heartwood colour. Density 0.6–0.68–0.8 g/cm³.
Vessels. Wood diffuse-porous. Vessels in multiples, commonly short (2–3 vessels) radial rows. Average tangential vessel diameter 120–180–255 µm. Average number of vessels/mm² 2–7–14. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 9–13 µm, vestured. Vessel-ray pits with distinct borders, similar to intervessel pits, of uniform size or type.
Tracheids and fibres. Fibres of medium wall thickness. Average fibre length 1000–1350–1750 µm. Fibre pits common in both radial and tangential walls, simple to minutely bordered. Fibres non-septate.
Axial parenchyma. Axial parenchyma paratracheal. Paratracheal axial parenchyma aliform. Aliform parenchyma winged. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 2–4.
Rays. Rays 4–10 per tangential mm, multiseriate (also if only few), 2–5 cells wide. Rays composed of two or more cell types (heterocellular). Heterocellular rays with square and upright cells restricted to marginal rows, mostly mostly 1 marginal row of upright or square cells and mostly 2–4 marginal rows of upright or square cells. Sheath cells absent.
Storied structures. Storied structure present, all rays storied, axial parenchyma storied, vessel elements storied.
Secretory structures. Intercellular canals absent.
Mineral inclusions. Crystals present, prismatic, located in ray cells and axial parenchyma cells. Crystal-containing ray cells upright and/or square, upright and/or square ray cells chambered. Crystal-containing axial parenchyma cells chambered. Number of crystals per cell or chamber one. Cystoliths absent. Druses and micro crystlas occur sporadically. Silica present, as grains and in aggregates, in rays cells and in axial parenchyma.
Illustrations. • Transverse section. Distemonanthus benthamianus. • Tangential section. Distemonanthus benthamianus. • Radial section. Distemonanthus benthamianus. • Mineral inclusions. Distemonanthus benthamianus. Note: Both prismatic crystals and silica occur in rays (left) as well as in axial parenchyma (right). • Mineral inclusions under polarized light. Distemonanthus benthamianus. Note: Occasional presence of crystal sand (left under normal and polarized light), druses (centre), and different size prismatic crystals (right).
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’.