Revisão taxonômica do gênero Peltogyne Vogel e ontogenia floral do clado Hymenaea (Leguminosae-Detarioideae)Hymenaea (Leguminosae-Detarioideae)

Leguminosae is the third largest family of Angiosperma, with about 19,500 species.In recent years, several studies have not only demonstrated that Leguminosae is monophyletic but have also allowed for a reorganization culminating in the separation of six Leguminosae subfamilies.Among them, the subfamily Detarioideae presents a clade composed by the genera Peltogyne, Hymenaea and Guibourtia, called clade Hymenaea.Detarioideae commonly has flowers with 21 floral pieces, but the Hymenaea clade has only 20 due to the reduction in the number of sepals.Still, the genus Guibourtia has no petals which deference to the other species of the clade.The genus Hymenaea has a peculiar species (H.verrucosa) that despite having five petals, two are trace.The largest genus of the clade is Peltogyne which, despite having 23 species, needs a taxonomic revision, since there has been a considerable increase in the volume of collections in recent years.Thus, the thesis presented aimed to perform a taxonomic revision for the Peltogyne genus and to investigate the floral ontogeny of the clade Hymenaea (Detarioideae-Leguminosae).The study is organized into four chapters.Chapter 1 refers to the Peltogyne taxonomic review, which resulted in twenty-five accepted species, including a new species for the genus, accompanied by geographic distribution maps, illustrations, identification keys, taxonomic comments, and biology as preferred environments for each species.Chapter 2 deals with the study of floral ontogeny of five species of the Hymenaea clade, where it was possible to unravel the reduced number of floral pieces by fusion in the case of sepals and petals in Guibourtia that can be in early development.In chapter 3 we conducted a study of Hymenaea verrucosa, a species whose flowers with three showy petals and two traces are unusual for the Hymenaea clade.In chapter 4 we describe a new species (Peltogyne barbata) that is accepted for publication.We recognize as the most important contributions, the review for Peltogyne, with a new species described for science, in addition to elucidating the reduction in the number of floral pieces and also their pathways of development. Sumário