-(Floristic composition of tree species and phytogeographic affinity of a semideciduous forest in Nova Lima, Minas Gerais State, Brazil). The Nova Lima city (metropolitan area of Belo Horizonte, Minas Gerais State, Brazil) is located in an ecotone between Cerrado (Brazilian Savanna) and Atlantic Forest, wich are two of the world's biodiversity hotspots. A floristic survey was carried out in a semideciduous forest (20°00' S and 43°55' W) in order to establish its relations with other forests (rain forest and semideciduous) from both hotspots, as well as to assess their phytogeographical insertion. The region is under high pressure due to urban expansion. The floristic survey of the semideciduous forest was based on specimens of woody plants collected both in and outside of 44 plots of 20 × 5 meters. The studied forest was compared with other 72 forests of Minas Gerais, São Paulo, Espírito Santo, Rio de Janeiro and Goiás States and the Federal District using multivariate analyses. At semideciduous forest 205 species of 49 botanical families were found. The record of species with restricted distribution to Atlantic Forest was 15 times greater than in the Cerrado. The tree flora of the semideciduous forest studied is a subset of that of rainforests, with species that are more efficient in coping with a longer dry season. Thus, the forest may be considered an Atlantic Forest.Key words -atlantic forest, cerrado, floristic, phytogeography, semideciduous forests RESUMO -(Composição florística do componente arbóreo e afinidade fitogeográfica de uma floresta semidecídua em Nova Lima, MG). O Município de Nova Lima, na Região Metropolitana de Belo Horizonte (MG), encontra-se no contato entre os domínios do Cerrado e da Mata Atlântica, que são dois hotspots de biodiversidade. Uma amostragem florística foi realizada em uma floresta semidecídua (20°00' S e 43°55' W) com o objetivo de avaliar sua relação com outras florestas semidecíduas e ombrófilas presentes em ambos os domínios a avaliar sua afinidade fitogeográfica. A região estudada encontra-se sob alta pressão antrópica devido à expansão urbana. A amostragem florística foi baseada na coleta de todos os indivíduos lenhosos presentes fora e dentro de 44 parcelas retangulares de 20 × 5 metros. A floresta estudada foi comparada com outras presentes no Distrito Federal e dos Estados de Minas Gerais, São Paulo, Espírito Santo, Rio de Janeiro e Goiás usando análises multivariadas. Foram encontradas 205 espécies representando 49 famílias botânicas. O registro de espécies com distribuição restritas a Mata Atlântica foi 15 vezes maior que do Cerrado. A flora arbórea da floresta estudada é, em boa medida, um subconjunto da flora das florestas ombrófilas, tendo espécies provavelmente mais eficientes em resistir e competir sob condições de seca mais prolongada. Assim, a floresta semidecídua estudada pode ser considerada como floresta atlântica sensu lato.
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