A new species and taxonomic notes on Gouania (Rhamnaceae, Gouanieae) from South America

Gouania, with ca. 70 species, is one of the largest genera within Rhamnaceae and forms a well-supported clade along with six other genera in the tribe Gouanieae. Despite recent progress in the delimitation of the genus, numerous taxonomic issues remain unresolved among the South American species, particularly regarding species circumscriptions, as well as the validation and typification of several taxa, especially those published in the 19th century. This study represents part of a taxonomic revision of the South American taxa of Gouania that is currently underway, including the description of a new species, Gouania neglecta, as well as the typification of five South American species: Gouania alnifolia, G. discolor, G. podocephala, G. rumicina, and G. ulei.