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do Carmo, J.A., Salas, R.M., Cabral, E.L. and Cabaña Fader, A.A. 2026. Two new species of Hexasepalum (Rubiaceae: Spermacoceae) from the ʻcampo rupestreʼ of Brazil. European Journal of Taxonomy. 1075, 1 (Jul. 2026), 1–22. DOI:https://doi.org/10.5852/ejt.2026.1075.3302.