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diverse assortment of vegetation types sharing the common physical characteristic of dominance by shrubs. A shrub is defined as a woody plant not exceeding 5 metres (16.4 feet) in height if it has a single main stem, or 8 metres if it is multistemmed. The world's main areas of scrubland occur in regions that have a Mediterranean climate-i.e., warm temperate, with mild, wet winters and long, dry summers. These areas include southern Australia, the Mediterranean region, California, Chile, and South Africa. Other scrublands are found in the semiarid tropics and in the Arctic, but smaller areas also occur in many other places. Australia, primarily because of its dry, variable climates, probably has the greatest expanse and range of scrublands. Their distribution is shown in