Abstract
Premise of research. Phylogenetic analyses have shown that tribe Melastomateae is biphyletic, consisting of two nonsister clades, the core Melastomateae and the Marcetia alliance, both supported by molecular and morphological characters.Methodology. In this study, we describe the new tribe Marcetieae and revise its generic limits based on a molecular phylogeny and a reevaluation of morphological characters. A short description; notes on distribution, habitat, and taxonomy; and a list of species plus an identification key are presented for all accepted genera.Pivotal results. We propose the recognition of 19 genera in this tribe, including a new genus (Rostranthera) and the resurrection of Dicrananthera, Leiostegia, Noterophila, and Pseudoernestia.Conclusions. Ernestia and Macairea were not fully resolved either in the molecular phylogeny or morphologically, and these genera need additional sampling of taxa and molecular markers to define their generic limits.
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