CONTENTS. 



Tribe 3, Cereeae continued from Vol. II. page. 



Subtribe 3, Echinocereanae 3 



Key to Genera 3 



Echinocereus 3 



Austroeaetus 44 



Rebutia 45 



Chamaecereus 48 



Lobivia 49 



Eehinopsis 60 



Subtribe 4, Echinoeactanae 77 



Key to Genera 77 



Denmoza 7 S 



Ariocarpus 80 



Lophophora S3 



Copiapoa 85 



Pediocactus 90 



Toumeya 91 



Epithelantha 92 



Neoporteria 94 



Arequipa 100 



Oroya 102 



Matucana 102 



Hamatocactus 104 



Strombocactus 106 



Leuchtenbergia 107 



Echinofossulocaetus 109 



Feroeactus 123 



Echinomastus 147 



Gymnocalycium 152 



Echinocactus 1 66 



Homalocephala 181 



Astrophytum 182 



Eriosyce 1 86 



Malacoearpus 187 



Hickenia 207 



Frailea 208 



Mila 211 



Selerocactus 212 



Utahia 215 



Subtribe 5, Caetanae 216 



Key to Genera 216 



Discocactus 216 



Cactus 220 



Index 239 



III 





L 



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