By DiTomaso Joseph M.   Kyser Guy B.   Fredrickson Edward A.   in Western Journal of Applied Forestry

ISSN:0885-6095|19|4|268-276

Society of American Foresters‎(2004)‎

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By Wu Shan-Huah   Rejmánek Marcel   Grotkopp Eva   Ditomaso Joseph M.   in Taxon

ISSN:1996-8175|54|1|133-138

International Association for Plant Taxonomy‎(2005)‎

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