RESUMO -(Diversidade e estrutura de espécies arbóreas em área alagável do município de Londrina, Sul do Brasil). Um levantamento fitossociológico em área alagável do Parque Estadual Mata dos Godoy, Londrina, PR, sul do Brasil (23°27'S e 51º15'W) determinou a diversidade e a estrutura das espécies arbóreas. O levantamento foi realizado em 0,5ha utilizando-se 50 parcelas de 10m×10m, tendo-se como critério de inclusão o perímetro mínimo a altura do peito de 15cm. Para cada espécie foram calculadas a densidade, a freqüência e a dominância. Palavras-chave -áreas alagáveis, classes de tamanho, riqueza de espécies, fitossociologia, sul do Brasil ABSTRACT -(Diversity and structure of a tree species community in flooded area in the municipality of Londrina, Southern Brazil). A phytosociological study was developed in flooded area of the Mata dos Godoy State Park, municipality of Londrina, southern Brazil (23º27'S and 51°15'W) in order to determine the diversity and the structure of tree species. Fifty 10m×10m plots (0,5ha) were used to sample trees with GBH (girth at breast height) ≥ 15,0cm. Density, frequency and dominance parameters were calculated for each species. In this area 912 living and 58 dead individuals were sampled. The living individuals were distributed in 26 families, 49 genera and 64 species. The value of the Shannon's diversity index was 3,44. The families with the highest species number were Leguminosae and Myrtaceae, while Nectandra megapotamica (Spreng.) Mez, Chrysophyllum
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