Evergreen Australasian tree having white or silvery bark and young leaves and yellow flowers WordNet 3.0 & Open English WordNet

Acacia dealbata, the silver wattle, blue wattle or mimosa, is a species of flowering plant in the legume family Fabaceae, native to southeastern Australia in New South Wales, Victoria, Tasmania, and the Australian Capital Territory, and widely introduced in Mediterranean, warm temperate, and highland tropical landscapes. Wikipedia

A plant belonging to the genus Mimosa usually found in tropical climates, their leaves are usually prickly and sensitive to touch or light, and have small white or pink flowers. Wiktionary

Plant belonging to the genus Mimosa. Wiktionary (translation)