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Boletín de la Sociedad Argentina de Botánica

On-line version ISSN 1851-2372

Abstract

MOGLIA, J. G; GONZALEZ, D  and  SANCHEZ, V. Anatomía del leño y dendrologia del quebracho iagunero Aspidosperma triternatum (Apocynaceae). Bol. Soc. Argent. Bot. [online]. 2012, vol.47, n.1-2, pp. 15-22. ISSN 1851-2372.

Wood anatomy and dendrology of quebracho lagunero Aspidosperma triternatum (Apocynaceae). The aim of present study is describe the dendrology and the secondary xylem of A. triternatum N. Rojas, Apocynaceae, an endemic tree of Humid Chaco of Argentina and Paraguay. The samples came from Ingeniero Juarez in Formosa. Wood and bark samples of 5 mature individuals were taken at 1,30 m height. The terminology of wood anatomical characters follows the recommendations of the IAWA Committee. External bark of A. triternatum is scaly with irregular, right-angled or isodiametric scales, and deep fissures with rounded ridges. The Wood is white- yellow to dark-yellow, without sapwood-heartwood distinction. The grain is oblique to interlock and fne textured. Growths rings boundaries are scarcely marked by thick-wall and radially flattened fbers. The wood is diffuse-porous not uniform, with numerous solitary vessels with elliptic outline. The axial parenchyma is apotracheal diffuse to reticulate. The rays are numerous mostly triseriates and homocellular, occasionally aggregates rays present. The fibers and fiber tracheids are medium with thick walls and distinctly bordered pits in some sectors. Wood anatomy structure of Aspidosperma triternatum follows the general pattern of the family Apocynaceae, and shows similar characteristics of the others Aspidospermas of Argentina.

Keywords : Aspidosperma triternatum; Secondary xylem; Anatomy; Dendrology.

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