Eight new species of Memecylon L. are described and illustrated from Madagascar (M. acrogenum, M. sejunctum, M. pterocladum, M. xiphophyllum, M. perditum, M. impressivenum, M. interjectum, M. amplifolium) together with one new species of Warneckea Gilg (W. masoalae). Also described is Memecylon mayottense, a new species from Mayotte (Comoro islands).
Melastomataceae, Memecylon, Warneckea, Madagascar, Comoro islands, Mayotte, new species