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Freitas, J.G., Alves, L.I.F., Zappi, D.C., Almeida, E.M.D., Peraza-Flores, L.N., Amaral, D.O.J.D., Araújo, D.B.P. and Batista, F.R.D.C. 2021. Novelties in Cactaceae from Eastern Brazil: Adding two new species and one new nothospecies to Tacinga (Opuntioideae). Phytotaxa. 490, 3 (Mar. 2021), 239–252. DOI:https://doi.org/10.11646/phytotaxa.490.3.2.