Abstract
While updating the list of species of the tribe Spermacoceae (Rubiaceae) from Brazil, the nomenclature of five published Diodia names was examined. We present two new combinations Diodella angustata (Steyerm.) E.L. Cabral & A. Cabaña-Fader and Mitracarpus froesii (Sucre) E.L. Cabral & E.B. Souza. Diodia barbeyana is included as new synonym of D. gardneri, Diodia microcarpais cited as new synonym of Borreria palustris, and D. appariciana as a new synonym of Borreria multiflora.
Kew words:
Brazilian flora; taxonomy; Diodella; Mitracarpus