Eucalyptus regnans, commonly known as mountain ash.

This eucalypt grows from 70 m to 102 m. tall.

It is native to the Australia states of Tasmania and Victoria.

It is a straight-trunked tree with smooth grey bark, but with a stocking of rough brown bark at the base.

They have glossy green, lance-shaped to curved adult leaves, flower buds in groups of between nine and fifteen, white flowers, and cup-shaped or conical fruit.

It is the tallest of all flowering plants.