Chaetanthera and Oriastrum

Focusing on the systematic and taxonomic study of the Mutisieae, this publication delves into the morphological and anatomical variations of around 50 South American species. It extensively revises the genus Chaetanthera and reinstates Oriastrum, highlighting character variation in relation to form, function, and habitat. The research discusses adaptations to environmental conditions, explores biogeography, and presents case studies on species complexes that illustrate polymorphism and speciation. Detailed species keys and descriptions enhance understanding of this diverse group.