-(Physiognomy and structure of a seasonal semidecidual lowland forest fragment in Northeastern Brazil). A quantitative survey was carried out in a seasonal lowland forest at "Estação Ecológica do Tapacurá" in the municipality of São Lourenço da Mata, Pernambuco. The aim of this study was to identify the relationship between the study area and other forests in the region. In the study area (8º03'04' '-8º03'53''S and 35º09'55''-35º10'48''W), altitudes range from 100 to 140 m average annual rainfall is 1,300 mm. All live or standing dead individuals with DBH ≥ 5cm were sampled within 50 plots (10 × 20 m). Seven quantitative surveys were selected in order to compare the regional forests using multivariate analysis. Eightyeight species, including three undentified taxa, were sampled. Most species present simple (68.2%) and mesophyllous (76.1%) leaves. Total density, total basal area, height and medium and maximum diameter were 1,145 ind.ha -1 ; 23.9 m 2 .ha -1 ; 10.73 m (± 4.67); 32 m; 13.14 cm (± 6.98) and 77.35 cm, respectively. Most important species of understorey (plants shorter than 8 m) were: Gustavia augusta (Lecythidaceae), Actinostemon verticillatus (Euphorbiaceae) and Psychotria capitata (Rubiaceae). In the middle storey (17 to 20 m) Chamaecrista ensiformis (Fabaceae) was important, while in uperstorey (above 26 m), Pterocarpus rohrii (Fabaceae) and Tabebuia serratifolia (Bignoniaceae). Considering the physiognomic and structural aspects as well as the results of multivariate analyses, it is possible to note that the seasonal lowland forest studied is more related with ombrophilous lowland forest than the seasonal montane forests in the region.Key words -Brazilian Northeast, physiognomy, seasonal forest, vertical structure RESUMO -(Fisionomia e estrutura de um remanescente de floresta estacional semidecidual de terras baixas no nordeste do Brasil). Foi realizada a descrição da comunidade arbórea da floresta estacional localizada na Estação Ecológica do Tapacurá, município de São Lourenço da Mata, Pernambuco, com objetivo de avaliar suas relações com outras florestas da região. A área de estudo (8º03'04''-8º03'53'S e 35º09'55''-35º10'48''W) apresenta cotas altitudinais variando entre 100 a 140 m e precipitação média de 1.300 mm. ano -1 Foram amostrados todos os indivíduos vivos ou mortos, ainda de pé, com DAP ≥ 5 cm, presentes em 50 parcelas (10 × 20 m) e selecionados sete levantamentos quantitativos com objetivo de comparar as florestas da região. Foram amostradas 88 espécies/morfoespécies, incluindo três táxons não identificados. A maioria das espécies apresenta folhas simples (68,2%) e mesófilas (76,1%). A densidade total, área basal total, altura e diâmetro médios e máximos foram 1.145 ind. ha -1 ; 23,9 m 2 .ha -1 ; 10,73 m (± 4,67); 32 m; 13,14 cm (± 6,98) e 77,35 cm, respectivamente. No estrato mais baixo (abaixo de 8 m), destacaram-se Gustavia augusta (Lecythidaceae), Actinostemon verticillatus (Euphorbiaceae) e Psychotria capitata (Rubiaceae). No estrato médio (17 a 20 m), destacou-se Chama...
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