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Mallee is the growth habit of certain eucalypt species that grow with multiple stems springing from an underground lignotuber, usually to a height of no more than 10 metres (33 ft). It is most common in plants of the genus Eucalyptus, many of which naturally grow in a mallee habit, and some of which grow as single-stemmed trees initially but recover in mallee form if burnt to the ground by bushfire. It also occurs in the closely related genera Corymbia and Angophora. The word mallee may also be used as a noun in reference to species or individual plants with a mallee habit.
Mallees are the dominant vegetation throughout semi-arid areas of Australia with reliable winter rainfall. Within this area, they form extensive woodlands and shrublands covering over 250,000 square kilometres (97,000 sq mi). Thus mallee woodlands and shrublands are considered one of Australia's Major Vegetation Groups.
Widespread mallee species include:
The malleefowl is a bird characteristic of this habitat.
An example of a mallee in a high-rainfall area is the rare yellow-top mallee ash, Eucalyptus luehmanniana.