The taxonomic treatment of Loranthaceae and Santalaceae of southern Brazil is presented. In Loranthaceae, four genera and seven species were identified: Ligaria cuneifolia, Psittacanthus dichroos, Struthanthus martianus, S. polyrhizus, S. sessiliflorus, S. uraguensis and Tripodanthus acutifolius. Psittacanthus hatschbachii is proposed as a synonym of P. dichroos and Struthanthus polyrhizus var. oblongifolius are proposed as a synonym of S. polyrhizus. In Santalaceae only one genus and species was confirmed: Eubrachion ambiguum. We present identification keys for the families and genera of mistletoes of southern Brazil. We provide morphological descriptions, taxonomic and distribution comments, and illustrations or photographs of plant structures.
Ligaria; Psittacanthus; Struthanthus; Tripodanthus; Eubrachion
