In the present study the anatomical description of the branch xylem of three forest species Parkia igniflora Ducke "Goma pashaco", Eschweilera rufifolia S. A. Morí "Machimango colorado", Trichilia maynasiana C. DC "Requia negro del Arboreto "El Huayo", Puerto Almendras - Iquitos. Applying the methodology of Valderrama (217, p 175). The species Parkia igniflora Ducke", presents an average tangential diameter of 187.91 ?m, classified as medium, with an average pores/mm2 of 3.56, classified as few, the average length of the vascular elements was 255.09 ?m classified as large, the rays have an average height of 245.04 ?m, classified as very short; having 24.71 ?m wide on average, classified as very fine. The average fiber length is 570.07 ?m, classified as short; being total fiber diameter 38.79 ?m, classified as medium; cell wall thickness on average gave 7.70 ?m, classified as thin. The s...