The natural fragments of floodplain forests known as "ipucas" are located in the Araguaia plain, in form of natural depressions, which are located in areas of floodplains in the State of Tocantins, favoring its flooding and, consequently, the largest period of water retention during periods of high precipitation. The present study was developed at Lagoa Verde farm, municipal district of Lagoa da Confusão, Tocantins between the coordinates UTM: 643586 and 644060 east and 8792795 and 8799167 north. The objective of the work was to characterize the structure of a floodplain forest fragment of approximately one-hectare area, inserted in area of irrigated rice cultivation. For the phytosociological survey, all the tree/shrub individuals with perimeter at 1.30m (PBH) ≥ 15 cm were sampled. On the whole, 807 individuals, 35 families and 70 species were sampled. The species with higher VC, in descending order, were Hirtella racemosa Lam., Qualea multiflora Mart. and Cecropia pachystachya Trécul. The richest families in species were Fabaceae (9), Vochysiaceae (6), Annonaceae and Malvaceae (4). The Shannon diversity index (H′) was 3.44. The distribution of diameter classes showed an inverted "J" curve, with most of the individuals being in the first class.