Renan is conducting integrative research to uncover the natural history of the genus Nissolia (Leguminosae). This genus is widely distributed across the Neotropics. During his time at UNAM, he curated the entire Nissolia collection, refining species delimitation, describing new species to science, performing stem anatomical sections and analyzing stem anatomy. He was also invited to do the treatment of the genus Nissolia for the Flora Mesoamericana, a project involving UNAM and the Missouri Botanical Garden.