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A 10 ha stand of a semi-deciduous forest of the Raio de Sol s farm (15º 45 54 S and 49º 04 03 W) was studied. It is inserted into the bioregion of the Cerrado EcoMuseum, state Goiás. For the phytosociological survey, ten sample plots of 20x20m each were systematically laid out. In these plots all living trees with DBH above 5 cm were measured. 742 individuals belonging to 83 species, 67 genera and 38 families were registered. The richest families in number of species were Leguminosae, Rubiaceae, Myrtaceae, Apocynaceae and Chrysobalanaceae. The species with the highest importance value index were Tapirira guianensis Aubl., Protium heptaphyllum (Aubl.) March, Callisthene major Mart., Amaioua guianensis Aubl. and Anadenanthera macrocarpa (Benth.) Brenan.The Shannon diversity index was 3.80 nats/individual and the Pielou equality index 0.86.