Typifications and new synonyms of South American species of Sebastiania (Euphorbiaceae), including nomenclatural clarification of the generic type

We present 21 new synonyms and 15 lectotypifications associated with South American species of Sebastiania. We also clarify the identity of the type species of the genus, S. brasiliensis, and make a new combination, S. ramosissima. These nomenclatural changes are based on study of the protologues and original material, of the treated species.