By Carrington Mary E.   Mullahey J. Jeffrey   Krewer Gerard   Boland Bob   Affolter James   in Southern Journal of Applied Forestry

ISSN:0148-4419|24|3|129-134

Society of American Foresters‎(2000)‎

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By Bone Tiffany S.   Downie Stephen R.   Affolter James M.   Spalik Krzysztof   in Systematic Botany

ISSN:1548-2324|36|3|789-805

American Society of Plant Taxonomists‎(2011)‎

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