International Association for Cultivated Plant Taxonomy
Freek Vrugtman, curator emeritus, Royal Botanical Gardens, Hamilton, Ontario, Canada; curator of collections 1968 until retirement in 1992.
Registrar, International Registration Authority for Cultivar Names in the Genus Syringa (lilacs), and compiler of the International Register and Checklist of Cultivar Names in the Genus Syringa.
Regular contributor to Lilacs - Quarterly Journal of the International Lilac Society.
Member of the ISHS (International Society for Horticultural Science), Executive Committee, Commission for Nomenclature and Cultivar Registration.
Member of the IUBS (International Union of Biological Sciences) Commission for the Nomenclature of Cultivated Plants.
Member of the Editorial Committee for the International Code of Nomenclature for Cultivated Plants, 6th ed., 1995, and 7th ed., 2004.