Résumé
After detailed morphological comparison, the genera Mazaea (incl. Neomazaea) and Ariadne are considered to be synonymous, for which a new combination, M. shaferi, is provided. Acunaeanthus is maintained as a separate monotypic genus. Phyllomelia, previously treated as genus incertae sedis, is here transferred to the Rondeletieae, and believed to be closely related to Mazaea. The systematic position of Eosanthe remains dubious until fertile collections become available. Complete descriptions, synonymies, typifications, and distributions on Mazaea, Acunaeanthus, Phyllomelia, and Eosanthe are presented, and Mazaea and Phyllomelia are illustrated.