Contents

PAGE.

Introduction 3

Order Cactales 8

Family Cactaceae 8

Key to Tribes 8

Tribe Pereskieae 8

Pereskia 8

Key to Species 9

Tribe Opuntieae 24

Key to Genera 24

Pereskiopsis 25

Pterocactus 30

Nopalea 33

Tacinga 39

Maihuenia 40

Opuntia 42

Key to Subgenera and Series 44

Subgenus Cylindropuntia 46

Series Ramosissimae 46

Series Leptocaules 46

Series Thurberianae 52

Series Echinocarpae 56

Series Bigelovianae 58

Series Imbricatae 60

Series Fulgidae 67

Series Vestitae 71

Series Clavarioides 72

Series Salmianae 73

Series Subulatae 75

Series Miquelianae 78

Series Clavatae 79

Subgenus Tephrocactus 84

Series Weberianae 84

Series Floccosae 86

Series Glomeratae 87

Series Pentlandianae 90

pAGE.

Family Cactaceae—continued.

Tribe Opuntieae—continued. Opuntia—continued.

Subgenus Platyopuntia 99

Series Pumilae 100

Series Curassavicae 102

Series Aurantiacae 106

Series Tunae 110

Series Basilares 118

Series Inamoenae 125

Series Tortispinae 126

Series Sulphureae 133

Series Strigiles 136

Series Setispinae 136

Series Phaeacanthae 139

Series Elatiores 149

Series Elatae 156

Series Scheerianae 159

Series Dillenianae 159

Series Macdougalianae 169

Series Tomentosae 172

Series Leucotrichae 174

Series Orbiculatae 176

Series Ficus-indicae 177

Series Streptacanthae 181

Series Robustae 191

Series Polyacanthae 193

Series Stenopetalae 200

Series Palmadorae 201

Series Spinosissimae 202

Series Brasilienses 209

Series Ammophilae 211

Series Chaffeyanae 213

Grusonia 213

Appendix 216

Index 227

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