'''Mountain ash''' may refer to: * ''Eucalyptus regnans'', the tallest of all flowering plants, native to Australia * Mountain-ashes or rowans, varieties of trees and shrubs in the genus ''Sorbus'' * ''Fraxinus ornus'', a true ash (genus ''Fraxinus'') also, but less commonly, known as mountain ash
==See also== * Mountain Ash, Rhondda Cynon Taf, a town in Wales * Mountain Ash, Kentucky, a town in the United States
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