A nomenclatural conspectus is presented for the species of Waltheria (Malvaceae: Byttnerioideae) that occur in Brazil. Synonymies 33 species, 23 endemic, are presented. Seven names newly synonymized. In addition, eight excluded or unresolved discussed. Thirty-nine lectotypes designated names, one neotype name an Astropus and two Visenia. These last lectotypifications supersede previous ones, wh...