-There is a growing interest in bee conservation given their importance for the maintenance of biodiversity and food production. However, little is known about most bee species and their associated flora, particularly in the Neotropics. In this study, based on raw data published and own data, we presented the most important plant families for the maintenance of the tribes and functional groups of bees across different Brazilian ecoregions. We also present the close relationship of tribes composed by oligolectic bees and their associated plant families. In addition, we identified the most generalist bees of these ecoregions since they could be important to maintain community stability. specialization / generalization / Atlantic Forest / Caatinga / Cerrado