Abstract
Abstract Registration of cultivar names of woody ornamental plants in North America (exclusive of roses, fruits, and nuts) began in 1948 under the auspices of the American Association of Nurserymen (AAN). In 1959, Arnold Arboretum assumed responsibility for the registration of woody ornamental cultivars that had not been assigned to other registration authorities. In 1980, the International Society for Horticultural Science appointed the American Association of Botanical Gardens and Arboreta (AABGA) as North American Coordinator for the International Registration Authority for cultivar names of unassigned woody ornamentals and for National Registration authorities in the United States and Canada. Arnold Arboretum (1959–1980), the U.S. National Arboretum (1981-1984), and Longwood Gardens (1984–present) have served as International Registration Authorities for cultivar names of unassigned woody ornamentals.
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