The Official Registry and Checklist - Rosa is an official publication of the International Cultivar Registration Authority - Rosa, and it conforms to the standards set forth by the International Society for Horticultural Sciences, as documented in the International Code of Nomenclature for Cultivated Plants. This reference guide seeks to identify all cultivars of the genus Rosa, including those not registered, no longer in cultivation or extinct. Entries for more than 33,000 unique cultivars include all known synonyms for a given cultivar along with a detailed description of its growing habits and history. Rose enthusiasts worldwide will enjoy a vast wealth of knowledge at their fingertips with this most up-to-date registry.