• American Society of Plant Taxonomists
• American Chestnut Foundation
• American Forests
• American Public Gardens Association
• Botanic Gardens Conservation International
• Botanical Society of America
• Botanical Society of the British Isles
• California Oak Foundation
• Canadian Botanical Association
• Canadian Chestnut Council
• Canadian Forest Service
• International Society of Arboriculture
• International Union of Forestry Research Organizations
• National Tree Trust
• The Nature Conservancy
• North American Native Plant Society
• The Tree Register

Last Updated 15 February 2007

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