Trough continuous studies developed on Piperaceae of Brazil, a new species of Piper section Ottonia was found in the Rio Doce State Park. Piper rio-docense is an endemic species to the State of Minas Gerais, this is a very distinctive taxon, especially by its bullate and villous leaves. New names are provided for two species which were included in the genus Ottonia Sprengel: Piper carautensei E.F. Guim. & M. Carvalho-Silva and Piper duartei E.F. Guim. & M. Carvalho-Silva. Ottonia vilosa var. minensis Guimarães is a new synonym.
flora; morphology; taxonomy
