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Blue Ash

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Scientific Name: Fraxinus quadrangulata
Description: A large and valuable timber tree of the western and southwestern States 60-70' and sometimes 120' high, with a trunk diameter of about 30". Its distinguishing character is its four-sided twigs - at least the younger twigs are square in section. Bark light brownish gray, deeply broken perpendicularly but not continuously into thing scales, the young, vigorous, rather coarse branchlets becoming round with age.
Habitat: Found mostly in moist wood on rich limestone hills.
Range: From Michigan, Illinois and Iowa south to Kansas, Alabama and Arkansas.
Type: Tree

Source:Field Book of American Trees and Shrubs by F. Schuyler Mathews
Photograph: Paul Wray, Iowa State University from www.forestryimages.org.