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Schizolobium parahyba  var.  amazonicum  (paricá) is a promising forest species that has been planted in some states of the Amazon region in Brazil, to meet the demand of the plywood panel industry. The present work involves a study of the variations of the cambium and their impact on derivative tissues at different heights in the stem of  S. parahyba  var.  amazonicum . Except for the tangential diameter of the fusiform initials (DFI) and the width of the xylem cell layer in differentiation (WXD), there was significant statistical variation between the evaluated axial positions for all anatomical parameters of the cambium. A strong positive correlation was noticed between the length of the fusiform initials (LFI) with ray height (RH) [r = 0.79, degree of freedom (DF) = 7, P &lt; 0.05], vessel element length (VL) (r = 0.78, DF = 7, P &lt; 0.05) and fiber length (FL) (r = 0.74, DF = 7, P &lt; 0.05). The results of this study give quantitative support that the LFI is an important prognosis, not only for the VL and FL, but also for the rays, in hardwood species.

Axial variation in the cambium anatomy of Schizolobium parahyba var. amazonicum