The goal of this study is to document the occurrence of the genus Ugni Turcz. in Brazil, where it is rare and poorly known. Ugni comprises four species, but only U. myricoides (Kunth) O. Berg occurs in Brazil, in high-elevation areas on Roraima Mountain (State of Roraima) and in the Serra of Neblina (State of Amazonas). This species is only known in the Amazonian herbaria by just one collection. Ugni is easily confused with Myrtus L. due the morphological resemblance between them, but Ugni are shrubs or small trees. Its leaves are small, usually less than 2 cm long, and coriaceous, and have revolute margins and inconspicuous secondary veins; its flowers are solitary and usually have five, sometimes four, white petals with a reddish central spot and usually three, sometimes two, locules per ovary, each with four to 23 ovules; and its fruits have 15 to 20 seeds with C-shaped embryos.
Ugni; Myrtaceae; taxonomy; Serra of Neblina; Amazonia
