José Floriano Barêa Pastore and Guilherme Medeiros Antar 2021. Two new endangered species of Polygala series Trichospermae (Polygalaceae), endemic to the Cerrado domain, Tocantins State, Brazil. European Journal of Taxonomy. 762, 1 (Aug. 2021), 133–148. DOI:https://doi.org/10.5852/ejt.2021.762.1459.