A high diversity of begomoviruses that infect non-cultivated plants has been noted in Brazil. Here, we report the complete sequences of two new species of bipartite begomoviruses from Sida sp. plants collected in the state of Piauí, northeastern Brazil. The genomes of these viruses show a genomic organization that is typical of New World begomoviruses. In phylogenetic analysis, two closely related viruses (sida angular mosaic virus, SiAMV and sida chlorotic vein virus, SiCVV) clustered with other begomoviruses described in tomato and Sida plants in Brazil. Evidence of recombination is shown among isolates of the species described.