Mountain ash may refer to: * ''

Eucalyptus regnans ''Eucalyptus regnans'', known variously as mountain ash (in Victoria), giant ash or swamp gum (in Tasmania), or stringy gum, is a species of very tall forest tree that is native to the Australia states of Tasmania and Victoria. It is a straigh ...

'', the tallest of all flowering plants, native to Australia * Mountain-ashes or

rowan The rowans ( or ) or mountain-ashes are shrubs or trees in the genus ''Sorbus'' of the rose family, Rosaceae. They are native throughout the cool temperate regions of the Northern Hemisphere, with the highest species diversity in the Himalaya ...

s, varieties of trees and shrubs in the genus ''Sorbus''

See also