Abstract

Marcetia is a neotropical genus that can be distinguished within the Melastomeae (= Tibouchineae) principally by the combination of tetramerous flowers, eglandular leaves and simple anthers which lack both basally prolonged connectives and ventral appendages. With just one exception, the genus is endemic to Brazil where its 28 species are of very limited distribution, occurring mainly in areas of campo rupestre vegetation. In 1980 a long-term collaborative programme was established between the Royal Botanic Gardens, Kew and the University of Sdio Paulo, resulting in a series of successful joint expeditions to the mountains of Minas Gerais and Bahia. These expeditions have disclosed several new species of Marcetia, one of which is described here.

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