A set of very valuable urban forest fragments are those found in the towns of Margarita, Espinar and Davis, which are close to or on the periphery of the civil, residential and military installations of the old US military bases in the Province of Colón and included within the areas of operation of the Panama Canal. Due to being exposed, urban forests face many threats posed by unregulated urbanization, the lack of management and investment in their maintenance, therefore the objective of this research is to know the flora existing in the study areas to know the risks and threats it faces. This research was carried out from August to October 2017 and visual evaluations were made to the inventoried trees, a value was assigned, according to the level of risk determined in the inspection carried out, which allowed identifying the species that presented priority for their future valuation risky. The presence of 22 families was recorded, with 42 genera and 63 species. The best represented families were: Arecaceae and Lythraceae. The results of this research indicate that the trees in the areas studied are mostly in good condition, and it is important to maintain them so that in the future they continue to provide the benefits that they provide up to now as lungs in the areas studied.