American Public Gardens Association (APGA) is the International Cultivar Registration Authority (ICRA) for the cultivar registration of woody ornamental plants that have not already been appointed to an International Registration Authority.

ICRA’s are appointed by the International Society for Horticultural Science (ISHS) and operate within the provisions of the International Code of Nomenclature for Cultivated Plants (the Code). This program has played an important part of cultivated plant nomenclature over the last 50 years.

A list of current genera that APGA acts as the ICRA for can be found here.

Since APGA’s assumption of this role in 1959, member institutions and individuals within those organizations have acted as registrar on the association’s behalf. Thank you to the previous participants for their vital work:

  • 1959 – 1980 The Arnold Arboretum of Harvard University
  • 1981 – 1983 United States National Arboretum
  • 1984 – 1993 Longwood Gardens
  • 1993 Royal Botanic Gardens Ontario
  • 1994 – 2013 Brooklyn Botanic Garden
  • 2013 – Present United States National Arboretum, Stefan Lura, Registrar

The Plant Nomenclature and Taxonomy Professional Community provides oversight and continuity in this work, ensuring that the association and its registrars remain in good standing.

For more information on Plant Nomenclature and Taxonomy please visit the community page and Library & Media Center.