Despite having a wide geographic distribution, it is in the tropical regions that orchids present the highest occurrence of epiphytic and terrestrial species. Brazil, due to its large surface and predominantly tropical location, is one of the richest countries in Orchidaceae, and the Amazon region, with its expressive number of habitats, can be considered as one of the richest regions in diversity and density of Orchidaceae. The area chosen for this study is an igapó forest, located on the banks of the Marapanim River, in the community of Abaetezinho, municipality of Marapanim, which is closest by land to the municipality of Igarapé-Açu at about 13 km. In order to carry out this work, a survey of field data was conducted by sampling plots perpendicular to the riverbed, with a total of 6 plots each measuring 10.00 m x 20.00 m. The materials collected at the study site were taken for identification and compared to specimens from the MG herbarium. As a result, 30 species distributed in 20 genera were registered, where the species Dichaea picta Rchb.f., Epidendrum nocturnum Jacq., Maxillaria camaridii Rchb.f., Sobralia sessilis Lindl., Scaphyglottis sickii bPabst., Stellis paraensis Barb. Rodr. and Zigosepalum labiosum (L. C. Rich.) Garay are the most abundant, being found throughout the forest along the river (CNPq).
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