Foreword by Dr. Nigel Taylor, Curator, Royal Botanic Gardens, Kew Preface Acknowledgments History of the Genus Characteristics and Classification Cultivation Natural Habitats and Distribution Treatment of Species and Subspecies Macrosemineum Gymnocalycium Microsemineum Trichomosemineum Muscosemineum Names of Uncertain Application Glossary and Abbreviations Further Reading References Appendix 1: Gymnocalycium Chromosome Counts Appendix 2: Cristate and Variegated Plants Appendix 3: GC Gymnocalycium Field Numbers Index of Gymnocalycium Names