The new species Tibouchina melanocalyx R. Romero, P. J. F. Guimarães & Leoni (Melastomataceae) presents a glabrous hypanthium and calyx lobes, is black in dried material, has glabrous filaments and style, and has an ovary with a furrowed apex with five oblong appendages. These characteristics of the hypanthium and ovary are unique within the genus Tibouchina Aublet. This species occurs in highland, campos de altitude vegetation from the National Park of Caparaó and State Park of Serra do Brigadeiro, in Minas Gerais, Brazil.
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Vol. 19 • No. 2