Abstract
Due to the existence of gaps on vascular system knowledge for Arecaceae family species. This study had by purpose to approach vascular bundles types along S. exorrhiza leaf. Samples of different leaf sections were collected on Combu Island, Para State, Brazil. Histological blades were obtained according to standard techniques for plant anatomy. The analysis realized on vascular bundles of several sections revealed that the bundles are different caliber and by the number of metaxylema, protoxylema, phloema vases. The arrangement of fibrous cells, as well as parenchyma cells around vascular elements showed a fundamental importance to vascular bundles types characterization. In sheath, the bundles have ovoid and elliptic forms, while they are circular on the petiole. Rachis and pinnae form the regions where there was more vascular bundles showed an organization standard, on each leaf region, principally as to fibrous and parenchyma cells arrangement, these features provide support to species identification. Keywords: Palm; vascular system; fibers; parenchyma.
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