TL;DR: The recircumscription and updated synopsis of Thyrsanthemum, together with a synopsis of Weldenia, are presented, with three new combinations, four new lectotypes, an identification key, and comments, distribution maps, and illustrations for all accepted species.
Abstract: The recircumscription and updated synopsis of Thyrsanthemum, together with a synopsis of Weldenia, are presented, with three new combinations, four new lectotypes, an identification key, and comments, distribution maps, and illustrations for all accepted species.