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CONTENTS. 



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PAGE. 



Tribe Cereeae i 



Key to Subtribes i 



Subtribe Cereaiiae I 



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Key to Genera i 



Cereus • 3 



Monvillea 21 



Cephalocereus 25 



Espostoa 60 



Browtuugia . ^ 63 



Stetsoiiia 64 



Escoutria 65 



r 



Corryocactus 66 



Pachycereus 68 



Leptocereus 77 



Eulychnia 82 



Lemaireocereus 85 



Erdisia 104 



Bergcrocactus 107 



Leocereus 108 



Wilcoxia no 



Peniocereus 112 



Dendrocereus 113 



Machaerocereus 114 



Nyctoccreus 117 



Brachycereus 1 20 



Acanthoccreus 121 



Heliocereus ; 127 



Trichocereus 130 



PAGE. 



Tribe Cereeae — continued. 



Subtribe Ccrcanae — confinued. 



Jasminoccrcus 146 



Harrisia x 47 



Borzicactus 159 



Caruegica 164 



Binghamia 167 



Rathbuuia 169 



Arrojadoa '. 1 70 



Oreocereus 171 



Facheiroa 173 



Cleistocactus 173 



Zehntnerella 1 76 



Lophocereus 177 



Myrtillocactus 178 



Neoraimondia i8i 



Subtribe Hylocereanae 183 



ylocereus 1 83 



Wilmattea 195 



Selenicercus 196 



Mediocactus 210 



Deamia 212 



•Weberocereus 214 



Werckleocereus 216 



Aporocactus 217 



Strophocactus 221 



Appendix 223 



Index 227 



III 



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