1. Introduction 1

2. General Part 2
2.1 Morphology 2
2.2 Vegetative anatomy (by P. BAAS, Leyden) 3
2.3 Embryology (by F. BOWMAN, Amsterdam) 4
2.3.1 Introduction 4
2.3.2 Anther wall formation, microsporogenesis and microgametogenesis 5
2.3.3 Ovule, megasporogenesis and female gametophyte 5
2.3.4 Development of the endosperm 6
2.3.5 Embryogeny 6
2.3.6 Development and anatomy of the seed coat 7
2.4 Somatic chromosome numbers (by J. C. ARENDS, Wageningen) 9
2.5 Palynology and phylogeny (by G. THANIKAIMONI,
Pondicherry, India) 11
2.6 Phytochemistry (by R. HEGNAUER, Leyden) 14
2.7 Distribution 14
2.8 Habitat and life-cycle 26
2.9 The importance of cultivation 27
2.10 Hybrids 27
2.11 Pests 28

3. Taxonomic Part 29
3.1 Generic characters 29
3.2 Infrageneric groups 29
3.3 Artificial key to the species 31
3.4 Description of the species 33
3.5 Unidentified specimens 67
3.6 Doubtful names 68

Acknowledgements 68
Summary 69
References to the taxonomic part 69
Index of names 70
Identification list 71
Plates 1-23 75