ABSTRACT(Orchidaceae from Serra Negra and Serra do Funil, Rio Preto, Minas Gerais, and fl oristic similarity between grassland and forest formations of Brazil). Th is study presents a survey of the Orchidaceae from Serra Negra and Serra do Funil (SN/SF), 'Zona da Mata' , Minas Gerais state, and analyzes the fl oristic similarity of this family among 29 grassland and forest sites in Brazil. Cluster analysis used the UPGMA algorithm, Sørensen coeffi cient, and bootstrap analyses with 5,000 replications. Th e cluster analyses revealed low similarity indices; exceptions are the clusters composed of Serra Negra + Ibitipoca State Park and Ilha do Cardoso State Park + Juréia-Itatins Ecological Station. Th e results suggest that SN/SF represents a fl oristic corridor between sites in Serra da Mantiqueira (Itatiaia National Park) and Serra do Mar (Macaé de Cima Biological Reserve). Groups of areas with similar environmental conditions were observed and the "campos rupestres" regions stood out because of their singular fl oristic composition. Th e Mantel test revealed that fl oristic similarity is not associated with geographic distance between the areas.