Resumo Este trabalho apresenta o tratamento florístico de Ochnaceae no Parque Nacional do Itatiaia, contribuindo com o conhecimento da família na Serra da Mantiqueira. A família está representada por quatro espécies de Ouratea (O. campos-portoi, O. parviflora, O. semiserrata e O. vaccinioides) e duas espécies de Sauvagesia (S. erecta e S. vellozii). As espécies são encontradas majoritariamente na parte baixa do Parque, geralmente associadas a corpos d’água. Com exceção de S. erecta, que possui ampla distribuição, todas as demais espécies são endêmicas do Brasil, sendo O. campos-portoi endêmica do Parque. São fornecidas descrições, chave de identificação, além de ilustrações e comentários sobre distribuição geográfica, hábitat e variação morfológica das espécies.

Abstract This manuscript presents the floristic treatment for Ochnaceae from the Itatiaia National Park, contributing to the knowledge of the family in Serra da Mantiqueira. The family is represented by four species of Ouratea (O. campos-portoi, O. parviflora, O. semiserrata and O. vaccinioides) and two species of Sauvagesia (S. erecta and S. vellozii). The species are found mostly in the lower part of the Park, usually associated to watercourses. All species treated but S. erecta, which has a wide distribution, are endemic to Brazil, and O. campos-portoi endemic to the Park. Descriptions, identification keys, illustrations, and comments on the geographic distribution, habitat and morphological variation of the species are provided.

ABSTRACT Based on molecular data, the tribe Chironieae (Gentianaceae) is divided into three subtribes. This study aims to describe the pollen morphology of representatives of two of the three subtribes that occur in the Atlantic Forest in order to contribute to a better understanding of the palynology of these taxa and to clarify the taxonomy of the family: subtribe Chironiinae (Centaurium erythraea and Zygostigma australe) and subtribe Coutoubeinae (Coutoubea ramosa, C. spicata, Deianira chiquitiana, D. damazioi, D. erubescens, D. nervosa and D. pallescens). Botanical material was obtained from exsicates and treated by acetolysis for light microscopy. Pollen grains were measured and photomicrographed, and the results statistically analyzed. For SEM study, non-acetolyzed pollen grains were sprayed onto metal stubs. The results show that the pollen grains in Chironiinae are medium-sized, prolate-spheroidal or subprolate, 3-colporate, monads, with striate-reticulate ornamentation. In Coutoubeinae the pollen grains are large or medium-sized tetrads with aperture varying between 3-porate or 3-hemicolpates and the sexine microreticulate (D. erubescens) or varied reticulate (the other species). Pollen morphology proved to be an important tool for the systematics of the family since it corroborated the existing placement of species into subtribes based on molecular data.