In the lowland hill forest of forest concession 16-LOR-MAR/COM-MAD-2016-049, located in the district of Pebas, Yavarí (Loreto), a total of 347 trees were recorded. These data were obtained from the PC1 forest census conducted for timber production purposes, allowing for an assessment of the horizontal structure of the commercial species. The trees were grouped into nine species distributed across seven botanical families, with Fabaceae and Myristicaceae representing the families with the greatest diversity, each comprising two species. The distribution of tree numbers per diameter class reached 1.37 trees per hectare. Notable species included Iryanthera grandis (0.41 trees/ha, 104 trees), Macrolobium gracile (0.28 trees/ha, 72 trees), Otoba parvifolia (0.21 trees/ha, 52 trees), and Carapa procera (0.14 trees/ha, 35 trees). Ecologically, Iryanthera grandis (Myristicaceae) was the most si...