Genus of flowering plants in the family Myrtaceae
Luma is a genus of flowering plants in the myrtle family Myrtaceae, described as a genus in 1853. It is native to the Valdivian temperate rain forests of Chile and Argentina.
They are shrubs or small trees with evergreen foliage and smooth red or orange bark, typically reaching tall and up to in trunk diameter. The leaves are opposite, oval, 1–5 cm long and 0.5–3 cm broad, entire, glossy dark green, with a spicy scent if crushed. The flowers are 2 cm diameter with four white petals and numerous stamens; the fruit is a small purple or black berry 1 cm diameter.
The genus name derives from the Mapuche (Native American) name for a related species, "Amomyrtus luma". Though it grows slowly, luma wood is very dense and durable. 
Species.
A long list of over 100 other names have been proposed in the genus, nearly all of them now regarded as members of other genera: "Blepharocalyx, Eugenia, Myrceugenia," etc.
References.
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