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" This directive contains the phytosanitary requirements for the importation into Canada of cultivated earthworms such as Lumbricus terrestris . Horticultural taxonomy was the specialty of Alfred Rehder , who produced a new edition of Manual of Cultivated Trees and Shrubs and , with Merrill 's support , the Bibliography of Cultivated Trees and Shrubs . The naming of such plants is now governed by a different code , the International Code of Nomenclature of Cultivated Plants . The intention is for the Plant Breeder 's Rights office in Australia to compile a list using the denomination classes and the International Code for Nomenclature of Cultivated Plants . After all , the International Code of Nomenclature of Cultivated Plants ( ICNCP ) defines a cultivar as being ' distinct , stable and uniform ' . When the International Code of Botanical Nomenclature was rewritten to separate the problems of horticulture as the International Code of Nomenclature of Cultivated Plants , emphasis was placed on the recognition of cultivars and as taxonomic and bibliographic units , and on the establishment of registration authorities . AMS met with members of the GBW on a number of occasions to develop the proposed U.S. Standards for Grades of Cultivated Ginseng . Since that time I have served in the capacity of North American registrar , reporting directly to Dr. Alan C. Leslie , International Rhododendron Registrar and Senior Registrar for the RHS.Current nomenclature regulations and recommendations are published in the International Code for Nomenclature of Cultivated Plants - - 1995 . Agricultural Marketing Service created the standards at the request of industry and published a previous notice in the Federal Register requesting comments on the proposed Standards for Grades of Cultivated Ginseng . Standards for Grades of Cultivated Ginseng . United States Standards for Grades of Cultivated Ginseng .