SOBRADO, S. V.; DO CARMO, J. A.; SIMÕES, A. O.; SALAS, R. M. Two new species of Psyllocarpus (Spermacoceae, Rubiaceae) from the state of Minas Gerais, southeastern Brazil. European Journal of Taxonomy, v. 806, n. 1, p. 161–176, 30 Mar. 2022.