Eucalyptus robusta, commonly known as swamp mahogany or swamp messmate, is a tree native to eastern Australia. Growing in swampy or waterlogged soils, it is up to 30 m (100 ft) high with thick spongy reddish-brown bark and dark green broad leaves, which help form a dense canopy. The white to cream flowers appear in autumn and winter. The leaves are commonly eaten by insects and are a food item for the koala. It is an important autumn-winter flowering species in eastern Australia and has been planted extensively in many countries around the world. Its timber is used for firewood and in general construction.

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