Ibitipoca State Park (PEIB) is located in southeastern Minas Gerais, in Santa Rita de Ibitipoca and Lima Duarte municipalities (21º40'-21º44'S; 43º52'-43º55'W). It has a variety of vegetation types, with a predominance of "campo rupestre" (rocky grasslands) mixed with forests. This work aimed to survey Orchidaceae species growing at PEIB. One-hundred-and-eighteen taxa belonging to 47 genera were found. The largest genera are Pleurothallis sensu lato (13 spp.), Oncidium (12 spp. and one probable hybrid), Epidendrum (10 spp.), and Maxillaria (9 spp.). Four species are new records for the flora of Minas Gerais state. Compared to other areas of "campos rupestres", PEIB is one of the most species-rich sites, in spite of having a relatively small area.
"campo rupestre"; Atlantic rain forest; cloud forest; biogeography
