Eucalyptus petiolaris, commonly known as Eyre Peninsula blue gum, water gum or blue gum, is a species of small to medium-sized tree that is endemic to South Australia. It is also naturalised in Western Australia. It has rough, flaky bark on the trunk, smooth greyish bark above, lance-shaped adult leaves, flower buds in groups of three, cream-coloured, yellow, pink or red flowers and cup-shaped or barrel-shaped fruit.

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