mountain ash

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various deciduous trees of the genus Sorbus of the rose family, having pinnately compound leaves, clusters of small white flowers, and orange-red berries.
• noun A very tall eucalyptus tree (Eucalyptus regnans) valued as a source of timber and pulpwood.

from The Century Dictionary.

• noun One of several small trees of the genus Pyrus, having ash-like leaves, primarily P. aucuparia
• noun One of several species of Eucalyptus, especially E. amygdalina, E. goniocalyx, E. Sie-beriana, and E. pilularis (the flintwood).
• noun See Texas ash.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun botany Any of several trees in the genus Sorbus in North America.
• noun UK The European species Sorbus aucuparia, also commonly known as rowan or more specifically European rowan.
• noun A tree native to southeastern Australia, Eucalyptus regnans, the tallest of all flowering plants.
• noun A Texan ash tree species, Fraxinus texensis.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun low-growing ash of Texas
• noun any of various trees of the genus Sorbus
• noun tree having wood similar to the alpine ash; tallest tree in Australia and tallest hardwood in the world