In Algodoal and Maiandeua islands, a restinga APA in the state of Pará, located in the municipality of Maracanã, the Myrtaceae R. Br. family is represented by 5 genera and in this work, Eugenia L. is treated. This genus, which is the largest among the Myrtaceae, presents at about 500 species in Tropical America, distributed in different ecosystems such as forest, cerrado, campo rupestre, restinga, etc. This work is a contribution to the study of Eugenia, since the identification of the species was in need of a careful revision. For this study, samples with flowers and fruits were collected in the field, and exsiccata from the MG and IAN herbaria were analyzed. The material was analyzed under a stereomicroscope, within the classical procedures used in plant taxonomy. It is characterized by the arboreal or bushy habit; inflorescences in racemes, sometimes forming fascicles, some species with isolated flowers, in pairs or in triads; persistent bracteoles and calyces; pedicel flowers, sepals 4, free, imbricated in the floral bud; petals 4; numerous stamens; ovary 2 - locular and berry fruit with persistent sepals. On the islands of Algodoal and Maiandeua, 7 species of Eugenia occur, divided into 2 groups according to the arrangement of the inflorescences: I. Cauliflorous inflorescences: Eugenia flavescens DC., E. tapacumencis Berg, E. lambertiana De. and E. protenta Me Vaugh (=E. protracta Berg); 11.axillary or terminal inflorescences: E. punicifolia (H.B.K.) DC., E. biflora DC. and E. patrisii Vahl. The paper contains descriptions, identification key, illustrations, geographical distribution and comments on the species.
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