APA Algodoal/Maiandeua is located in the municipality of Maracanã, northeast coast of the state of Pará, occupying an area of 385 ha, between the geographical coordinates of 00°34'4/1 to 00°34'30/1 5 and 47°31'05/1 to 47°34'12/1 W. The area consists of mangrove vegetation in the southern, central and northern portions of the island; hypersaline fields covered by herbaceous vegetation inside or near the mangroves; barrier formation in the interior of the island and restinga vegetation covering a large part of the sandy plain, in the northern, northeastern and western portions of the island. The present work deals with the survey of Ochnaceae species occurring in this area. The family Ochnaceae consists of about 400 species distributed in 30 genera of pantropical distribution. In Brazil, 120 species and 11 genera are found. For the study of the Ochnaceaeda APA, the vegetative and reproductive parts of all samples of the four species of the family occurring in the APAde Algodoal/Maiandeua herborized in the herbarium João Murça Pires, of the Museu Paraense Emílio Goeldi (MG) were dissected. Through bibliographic reviews and collections identified by specialists, the differential characteristics of the taxa were confirmed and an identification key for the species occurring in the APA was assembled. Four species were found for the family, distributed in two genera: Ouratea racemiformis Ule, Ouratea microdonta (Dalz) Engl, Ouratea castaneifolia (De) Engl. and Sauvagesia erecta L.
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