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Eucalyptus robusta
''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 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.
==Description==
''Eucalyptus robusta'' grows as a tree to around 20–30 metres (65–100 ft) tall, with a trunk up to 1 metre (3 ft) in diameter at breast height (dbh). The trunk and branches are covered with thick red-brown bark, which has a spongy feel and is stringy—peeling in longitudinal strips. The long irregular branches spread laterally, and form a dense canopy with the broad green leaves. Arranged alternately along the stems, these measure 10–16 centimetres (4–6.4 in) long by 2.7 to 4.5 cm (1.1–1.8 in) wide. The white or cream flowers are clustered in inflorescences of from seven to 13 flowers. The flowers appear anywhere from March to September, and peak over May and June.〔 Retrieved 12-24-2011.〕 The buds measure 2 cm by 0.8 cm (0.8 by 0.3 in) wide and are distinctive in that the operculum has a prominent long beak, making them fusiform (spindle-shaped).〔 Retrieved 11 April 2012.〕 The woody fruits ripen by May to October.〔
The bangalay (''E. botryoides'') is similar in appearance, but its flower buds are smaller with a conical operculum and only grow in groups of seven. The fruits are smaller and sessile, rather than on stalks.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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