The most recent three-year addendum to Sander’s List of Orchid Hybrids covering the years 2017–2019 to be published by the Royal Horticultural Society. It contains names, parentage, and names of registrant and originator for all orchid hybrids registered between 1 January 2017 and 31 December 2019 – over 11,000 hybrids. It also includes a master list of all accepted hybrid genera currently in use. The list includes their standard abbreviations and component genera. The last three years have seen 86 new orchid nothogenera named bringing the total to 2,588 hybrid genera in Orchidaceae.