This is a genus of plants of the Mimosaceae family (Fabaceae or according to the classification APG). In Italy the most well-known plants of this kind are mimosas, while the term acacia in everyday language refers to the species Robiniapseudoacacia. There are approximately 1300 Acacia species in the world, with 960 originating in Australia and the remaining widespread in warm regions and tropical climates of Africa, in Southeast Asia and the Americas. The acacia tree reaches a height of up to 25 metres. It is characterized by a light brown bark and very wrinkled imparipinnate leaves. The leaves are in fact made up of 11-21 smaller leaves which are open during the day and at night tend to overlap.