Miconia is a genus of in the Tibouchina family, Melastomataceae, native to warm temperate to Tropics regions of the Americas. The species are mostly and small to medium-sized up to 15 m tall. The generic name honours Catalonia physician and botanist Francesc Micó. Some species are known by the common name johnnyberry.
Many species are threatened by habitat destruction in their native range, and some are feared to be on the brink of . On the other hand, M. calvescens is a contributing factor in the decline and maybe even extinction of other plants: it has become a highly Invasive species weed on a number of Pacific Islands where it was introduced, including Hawaii and Tahiti. It is often referred to as the "purple plague" or the "green cancer" in reference to its habit of overgrowing native , and its leaves which are bright green above and bright purple below.
Miconia fruit are a favorite frugivory of many (invasive M. calvescens spreads by this route). The leaves of some species are eaten by of the moth-butterflies (Hedylidae).
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