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This study aimed to know the phytosociological composition of the arboreal component in an area of spring in Sirinhaem - PE. Ten plots (10 m x 25 m) were arranged in rays above the springs and distributed systematically in 5 lines, separated by a 45° angle, each. In each line, 2 plots were allocated, at an interdistance of 25 m. In each plot, all individuals with CAP ≥ 15 cm were sampled, which were measured and had the estimated height. The phytosociological parameters were analyzed and an admissible sampling error of 20% and probability level of 95% was adopted. The calculated sampling error was 18%, lower than that established. The spring had a density of 1,236 individuals ha -1 , with an estimated basal area of  27,647 m 2 ha -1 . Tapirira guianensis was characterized by a combination of large numbers of individuals, high dominance and high frequency, demonstrating that it is a species with wide distribution in the area. Regarding the relative frequency, in addition to T. guianensis , Eschweilera ovata and Inga flagelliformis were distinguished. The highest values of absolute dominance were of the species T. guianensis and Virola gardneri . In terms of Importance Value, the highlight was on T. guianensis and V. gardneri .

Phytosociology of the arboreal component in an area of Spring, Pernambuco