Commercial Timbers

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H. G. Richter and M. J. Dallwitz

Clarisia racemosa Ruiz & Pavon (Guariuba)

Nomenclature etc. MORACEAE. Trade and local names: mururé (BO); guariuba, oiticica amarela, o. da mata (BR); aji (CO); moral bobo, mata palo, pituca (EC); turupay amarillo (PE). Not protected under CITES regulations.

Tree. Geographic distribution: tropical South America.

General. Growth ring boundaries indistinct or absent. Heartwood basically golden yellow (turning a lustrous gold-brown upon exposure). Sapwood colour distinct from heartwood colour. Density 0.63–0.75 g/cm³.

Vessels. Wood diffuse-porous. Vessels arranged in no specific pattern, in multiples, commonly short (2–3 vessels) radial rows to radial rows of 4 or more. Average tangential vessel diameter 130–200 µm. Average number of vessels/mm² 3–13. Average vessel element length 300–500 µm. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 6–8 µm, not vestured. Vessel-ray pits with reduced borders or apparently simple, rounded or angular or horizontal to vertical. Helical thickenings absent. Tyloses in vessels present, thinwalled.

Tracheids and fibres. Vascular or vasicentric tracheids sporadic to absent. Fibres of medium wall thickness. Average fibre length 960–1500 µm. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Helical thickenings absent. Fibres non-septate.

Axial parenchyma. Axial parenchyma banded. Axial parenchyma bands 1–3(–4) per radial mm. Axial parenchyma paratracheal. Paratracheal axial parenchyma vasicentric, aliform, and confluent. Aliform parenchyma winged. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 2–4.

Rays. Rays 4–7 per tangential mm, multiseriate (also if only few), (1–)2–5 cells wide. Rays with multiseriate portions as wide as uniseriate portions absent. Aggregate rays absent. Rays of one size. Rays composed of two or more cell types (heterocellular). Heterocellular rays with square and upright cells restricted to marginal rows, mostly 1 marginal row of upright or square cells or mostly 2–4 marginal rows of upright or square cells. Sheath cells present (few). 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 or not observed (if present, very scarce), prismatic, located in ray cells and axial parenchyma cells. Crystal-containing ray cells upright and/or square, upright and/or square ray cells not chambered. Crystals in procumbent ray cells not in radial alignment. Crystal-containing axial parenchyma cells not chambered. Number of crystals per cell or chamber one. Silica present, as vitreous silica, in vessels. Vitrious silica of infrequent occurrence, lining vessel lumina or tyloses.

Illustrations. • Transverse section. Clarisia racemosa. • Tangential section. Clarisia racemosa. • Radial section. Clarisia racemosa.


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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’.

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