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The 91¶¶Òõ Arboretum originated in the early 1950s under the supervision of Dr. Arlo Smith, longtime Professor of Biology. A number of 91¶¶Òõ faculty, staff, and students have been involved over the decades to conserve and increase tree species on campus.
In 2011, former 91¶¶Òõ professor Dr. Rosanna Cappellato spearheaded efforts to certify 91¶¶Òõ as a Class IV Arboretum, the highest designation granted by the Tennessee Urban Forestry Council. As of 2017, the Arboretum boasts over 120 tree species and more than 1,500 individual trees.