ILLUSTRATIONS. 



Plate i. 

 Plate 2. 



Plate 3- 



Plate 4. 



Plate 5. 



Plate 6. 



Plate 7. 



Plate 8. 



Plate 9. 

 Plate 10. 



Plate ii. 

 Plate 12. 



Plate 13. 

 Plate 14. 

 Plate is- 

 Plate 16. 



Plate 17. 



Plate 18. 



Plate 19. 



Plate 20. 



Plate 2 1 . 

 Plate 22. 



Plate 23. 



Plate 24. 



PLATES. FACING 



PAGE. 



Plant of Ferocactus wislizeni near Pima Canyon, Arizona Frontispiece 



Top of flowering plant of Echinocereus coccineus. (2) Flower of same. (3) Flowering plant 

 of Echinocereus chloranthus. (4) Flowering plant of Echinocereus viridiflorus. (5) 



Flowering plant of Echinocereus maritimus 14 



Top of flowering plant of Echinocereus pentalophus. (2) Flowering plant of Echinocereus 

 fitchii. (3) Top of flowering plant of Echinocereus grandis. (4) Flowering plant of 



Echinocereus blanckii 22 



Top of flowering plant of Echinocereus sciurus. (2) Flowering plant of Lobivia cinnabarina. 

 (3) Flowering plant of Echinocereus fendleri. (4) Top of flowering plant of Echinocereus 



lloydii. (5) Flowering plant of Rebutia minuscula 36 



Top of flowering plant of Echinocereus engelmannii. (2) Flowering plant of Lobivia corbula. 



(3) Flowering plant of Lobivia pentlandii. (4) Flowering plant of Lobivia lateritia 56 



Top of flowering plant of Echinopsis turbinata. (2) Flowering plant of Echinopsis multiplex. 64 

 Top of flowering plant of Echinopsis silvestrii. (2) Top of flowering plant of Echinopsis 



leucantha 68 



Top of flowering plant of Pediocactus simpsonii. (2) Flower of Denmoza rhodacantha. (3) Flow- 

 ering plant of Ariocarpus kotschoubeyanus. (4) Top of flowering plant of Neoporteria 



subgibbosa 78 



Plant of Lophophora williamsii. (2) Plant of Ariocarpus retusus 84 



Flowering plant of Echinopsis aurea. (2) Flowering plant of Copiapoa coquimbana. (3) 



Flowering plant of Lophophora williamsii. (4) Flowering plant of same 86 



Plant of Ferocactus pringlei. (2) Plant of Ferocactus diguetii 122 



Top of flowering plant of Ferocactus townsendianus. (2) Top of flowering plant of Ferocactus 



wislizeni. (3) Flower of Ferocactus diguetii 124 



Plant of Ferocactus flavovirens. (2) Plant of Ferocactus latispinus 126 



Flowering plant of Ferocactus viridescens. (2) Top of flowering plant of Ferocactus rectispinus . 128 



and 2) Plants of Ferocactus acanthodes 13c 



Top of flowering plant of Ferocactus hamatacanthus. (2) Flowering plant of Sclerocactus 



whipplei. (3) Top of flowering plant of Ferocactus latispinus 146 



Floweiing plant of Gymnocalycium saglione. (2) Top of flowering plant of Gymnocalycium 



mostii. (3) Flower of same 158 



Flowering plant of Gymnocalycium megalothelos. (2) Top of flowering plant of Gymno- 

 calycium platense. (3) Flowering plant of Gymnocalycium multiflorum 160 



Top of flowering plant of Gymnocalycium platense. (2) Top of flowering plant of Gym- 

 nocalycium schickendantzii. (3) Top of flowering plant of Homalocephala texensis. 



(4) Fruit of same. (5) Seed of same 164 



Top of flowering plant of Malacocarpus tephracanthus. (2) Flowering plant of Malacocarpus 



ottonis. (3) Flowering plant of Echinocactus horizonthalonius. (4) Fruit of same. 



(5) Seed of same 174 



Flowering plant of Astrophytum capiicorne. (2) Top of flowering plant of Malacocarpus 



tephracanthus 19 



Top of flowering plant of Malacocarpus mammulosus. (2) Fruiting plant of Mila caespitosa. 

 (3) Flowering plant of Astrophytum myriostigma. (4) Fruiting plant of Malacocarpus 



islayensis 202 



Flowering plant of Hickenia microsperma. (2) Flowering plant of Malacocarpus ottonis. 

 (3) Fruit of Sclerocactus polyancistrus. (4) Seed of same. (5) Flowering plant of 



Echinofossulocactus violaciflorus 208 



Plant of Cactus lemairei. (2) Fruiting plant of Cactus harlowii. (3) Crown of same plant 

 in flower and fruit. (4) Flowering plant of Discocactus bahiensis. (5) Plant of Cactus 

 melocactoides 226 



IV 



