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CONTENTS 



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Introduction 



Order Cactales 



Family Cactaceae. 



Key to Tribes . . . 



Tribe Pereskieae 



Pereskia 



Key to Species 



PAGE. 



3 

 8 



8 



8 



8 



8 



9 



PAGE. 



Tribe Opuntieae 24 



Key to Genera 24 



Pereskiopsis 25 



Pterocactus 



30 



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Nopalea 33 



Tacinga ; 39 



Maihuenia 40 



Opuntia. 42 



Key to Subgenera and Series 44 



Subgenus Cylindropuntia 46 



Series Ramosissimae 4^ 



Series Leptocaules 46 



Series Thurberianae 52 



Series Echinocarpae 56 



Series Bigelovianae 58 



Series Imbricatae 



60 



Series Fulgidae 67 



Series Vestitae 7^ 



72 



■ 73 



75 



Series Clavarioides 

 Series Sabnianae . . 



Series Subulatae 



Series Miquelianae 78 



Series Clavatae 



79 



Subgenus Tephrocactus ..... . . . . ..... 84 



Series Weberianae 



Series Floccosae %'. 



•.--. 



84 



86 



Series Glomeratae 87 



Series Pentlandianae 



90 



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Family Cactaceae — continued. 

 Tribe Opuntieae — continued, 

 Opuntia — continued. 



Subgenus Platyopuntia 99 



Series Pumilae 100 



Series Curassavicae 102 



Series Aurantiacae 106 



Series Tunae no 



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Series Basilares 118 



Series Inamoenae 125 



Series Tortispinae 126 



■ 



Series Sulphureae 133 



Series Strigiles 136 



Series Setispinae 136 



Phaeacanthae 139 



Series Elatiores 149 



Series Elatae 156 



Series Scheerianae 159 



Series Dillenianae 159 



Series Macdougalianae 169 



Series Tomcntosae 172 



Series Leucotrichae 174 



Series Orbiculatae 1 76 



Series Ficus-indicae ^ 177 



Series Strcptacanthae i8i 



Series Robustae 191 



Series Polyacanthae 1 93 



Series Stenopetalae . 200 



Series Palmadorae 201 



Series Spinosissimae 202 



Series Brasilienscs 209 



Series Ammophilae 211 



Series Chaffeyanae 213 



Grusonia 215 



Appendix 216 



Index 227 



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