Twenty full-colour plates and descriptions of plants appear in this peer-reviewed biennial series, which has become a collector’s item of the African and specifically South African flora. This volume is dedicated to Prof. Gideon F. Smith, former Chief Director of Research at the South African National Biodiversity Institute and one of South Africa’s most prolific authors of, among other, Old and New World succulents. Contributions to this colourful edition include six Kalanchoe species, two Aloiampelos species, Brunsvigia radulosa, Justicia divaricata and various others. Two new species (Psychotria suber and Carissa sebrabergensis) and four new name combinations (different varieties for Aloiampelos tenuior) are published in this volume. The botanical art include plates by Gillian Condy, Marieta Visagie (with her Adenia repanda featured on the cover), Jenny Hyde-Johnson, Angela Beaumont and Lesley Deysel. A guide for authors and artists, and an index to species are also included. This volume celebrates 100 years of publishing this journal, from 1921 to 2021.