They are preferred names, synonyms and commercial names of almost 45,000 woody plants and 24,000 perennials, and they are the official names of the commercial range of nursery stock in Europe and largely the United States.
Most important changes are the addition of more than 12,000 new names (8,500 woody plants and 3,500 perennials).
There are various taxonomic changes in names after consultation with trade and industry.
The status of protection by Plant Breeders’ rights has been added to around 7,000 cultivars.
The list of names of woody crops is supervised by the European Nursery stock Association (ENA), and that of perennials by the Internationale Stauden Union (ISU). This makes them the international guiding lists in the nursery industry for determining the correct spelling and the preferred names of deciduous trees, conifers, fruit and perennials. The cooperation with these parties ensures a good balance of scientific/legal correctness and practical workability, say compilers.
In October 2014 Naktuinbouw (Netherlands Inspection Service for Horticulture) took over the registration of varieties of nursery stock from PPO (Applied Plant Research). This move also made Naktuinbouw responsible for issuing the lists of names. These editions could be realised partly with sector funds made available by the former Dutch Product Board for Horticulture.