CONTENTS. 



PAGE. 



Tribe Cereeae I 



Key to Subtribes I 



Subtribe Cereanae i 



Key to Genera i 



Cereus 3 



Monvillea 21 



Cephalocereus 25 



Espostoa 60 



Browningia 63 



Stetsonia 64 



Escontria 65 



Corryocactus 66 



Paehyeereus 68 



Leptoeereus 77 



Eulychnia 82 



Lemaireocereus 85 



Erdisia 104 



Bergerocaetus 107 



Leocereus 108 



Wilcoxia no 



Peniocereus 112 



Dendrocereus 113 



Machaerocereus 114 



Nyctocereus 117 



Brachycereus 1 20 



Acanthocereus 121 



Heliocereus 127 



Trichocereus 130 



PAGE. 



Tribe Cereeae — continued. 



Subtribe Cereanae — continued. 



Jasminocereus 146 



Harrisia 147 



Borzicactus 159 



Carnegiea 1 64 



Binghamia 167 



Rathbunia 169 



Arrojadoa 170 



Oreocereus 171 



Facheiroa 173 



Cleistocactus 173 



Zehntnerella 176 



Lophocereus 177 



Myrtillocaetus 178 



Neoraimondia 181 



Subtribe Hyloeereanae 183 



Hylocereus 183 



Wilmattea 195 



Selenicereus 1 96 



Mediocactus 210 



Deamia 212 



Weberocereus 214 



Werckleocereus 216 



Aporocactus 217 



Strophocactus 221 



Appendix 223 



Index 227 



