ILLUSTRATIONS. 



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FACING 

 PLATES. PACE. 



PlatG I Group of plants of Cephalocereus macrocephalus on hillside near Teliuacan Frontispiece- 



PLATG 2. (I) Top of flowering stem of Cereus alacriportanus. (2) Top of stem of Cereus peruvianus. ^ 



(3) Flower of Cereus peruvianus ;.';*'**/ \* '^ t'n ' * " 



PUATE 3. (0 TopofstemofCereusvalidus. (2) Top of flowering stem of Cereus vahdus, (3) TopoMiow- 



ering branch of Monvillea cavendishii. (4) Top of branch of M. cavenclishu, with fruit. 22 

 PtATB 4. (i) Flowering stem of Cephalocereus pentaedrophorus. (2) Top of stem of Cephalocereus gouuel- 



lei. (3) Top of stem of Cephalocereus bahamensis, with flower. (4) Fruit ol L^eplia- 



locercus deeringii "t? ' ' • "1 8 



PtATE 5. A clump of plants of Cephalocereus deeringii on Lower Matecumbe Key, Florida U,' ' ,* */ ' 



PUATK 6. (0 Top of flowering stem of Cephalocereus arrabidae. (2) Top of flowering stem of Cephalo- 

 cereus nobilis. (3) Top of flowering stem of Cephalocereus barbadensis 4^ 



Plate 7. (0 Plants of Cephalocereus polygonus. (2) Large plant of Cephalocereus chrysacanthus 48 



Plate 8. (i) Top of flowering stem of Cephalocereus brooksianus. (2) Top of stem of Cephalocereus ca- • 



tingicola. (3) Top of stem of Cephalocereus phaeacanthus. (4) Flowering branch of 



Leptocercus assurgens • - ^o 



Plate 9. A large plant of Stetsonia coryne in the desert of northern Argentina ^4 



Plate io. A plant of Escontria chiotilla, near Tehuacdn, Mexico ^^ 



Plate i i. Top of flowering plant of Pachycereus chrysomallus ,'*:**'' '^^ 



Plate 12. A mountain-side along Tomellin Canyon, Mexico, covered with Pachycereus columna-trajani. ... 76 



Plate 13. (i) Top of flowering branch of Leptocercus arboreus. (2) Top of stem of Lemaireocereus griseus. 



(3) Fruiting branch of Mediocactus coccineus 80 



Plate 14. (i) Part of branch of Deudrocereus nudiflorus. (2) Flowering branch of Dendroccreus nudiflorus. 



(3) Flowering branch of Nyctocereus guatemalensis 1 14 



Plate 1.5. (i) Top of branch of Eulychnia iquiquensis. (2) Top of stem of Lemaireocereus dumortieri. 



(3) Part of flowering stem of Nyctocereus serpentinus 118 



Plate 16. (i) Top of flowering branch of Acanthocereus pentagonus. (2) Top of flowering branch of Acan- 



thocereus subinermis. (3) Top of a fruiting branch of Acanthocereus subinermis. ... 124 

 Plate 17. (1) End of flowering branch of Heliocereus elegantissimus. (2) End of flowering branch of Helio- 



cereus speciosus. (3) A tip of a fruiting branch of Harrisia portoriceusis 128 



Plate 18. (i) Tip of a flowering branch of Harrisia eriophora. (2) Fruiting branch of Harrisia eriophora. . 148 

 Plate 19. (0 Top of flowering branch of Harrisia fragrans. (2) Top of fruiting joint of Harrisia fragrans. 



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(3) Fruiting branch of Harrisia martinii 150 



Plate 20. (i) Part of fruiting branch of Harrisia gracilis. (2) Top of flowering branch of Harrisia martinii. 152 



Plate 21. (x) Flowering branch of Harrisia tortuosa. (2) Fruiting branch of Harrisia tortuosa 156 



Plate 22. Top of flowering plant of Carnegica gigantea 164 



Plate 23. The giant cactus, Carnegiea gigantea, near Tucson, Arizona 166 



Plate 24. (i) Top of flowering branch of Harrisia fernowl. (2) Flowering branch of Harrisia bonplandii. 



(3) Top of branch of Binghamia melauostele 168 



Plate 25. (i) Flowering branch of Rathbunia alamoscnsis. (2) Flowering branch of Rathbunia alamoFcnsis. 



(3) Top of flowering branch of Borzicactus acanthurus. (4) Top of stem of Arrojadoa 



rhodantha 170 



Plate 26. (i) Myrtillocactus geometrizans, Tehuacan, Mexico. (2) Myrtillocactus schenckii, near Mitia, 



Mexico J 80 



Plate 27. (i) Endof fruiting branch of Arrojadoa rhodantha. (2) Top of plant of Cleistocactus baumannii. 



(3) Flower on branch of Hylocereus stenopterus 184 



Plate 28. Flower on end of branch of Hylocercm ocamponis 186 



PJ.ATE 29. Flower on end of branch of Hylocereus monacanthus. 188 



Plate 30. Flower near end of branch cf Hylocereus undatus 190 



Plate 3 1 • Flower on short branch of Hylocereus lemairei ..!.!............... 1 92 



Plate 32. (i) Fruit of Hylocereus undatus. (2) Flowering branch of Wihnattea minuliflora. "(3) Longitu- 

 dinal section of fruit of Selenicereus grandiflorus. . 196 

 Plate ^3- U) Flcwering branch of Selenicereus grandiflorus. (2) Tip of branch of Selenicereus grandi- 

 florus. (3) Fruit of Selenicereus grandiflorus log 



Plate 34. Flowering branch of vSelenicereus urbanianus 200 



Plate 3.S- Flower on branch of Selenicereus coniflorus ], ] 202 



Plate 36. (i) Fruit of Hylocereus trigonus. (2) Flower of 'Selenicereus boeckmanniiV * (3) Fruit'of Seleni- 



cereus boeckmannii 



Plate 37. Flower of Mediocactus coccineus ^^"^ 



Plate 38. (i) Fruiting branch of Selenicereus pterantht^s! ' '(2)' Flowering b;a^;ch of Selenicereus spinulosu^ 



(3) Flowering branch of Wcberocereus panamensis.. ... 



Uate 39. (r) Mowenug branch of Weberocereus tunilla. (2) Flowering branch of Wcberocereus' biolieyi'. 



Plate 4o (,) Flower i n ^rZ^'^A .^^^^ ^^^ Flower of Werckleocereus glaber. 216 

 tUATL 40. (I) I lowermg plant of Aporocactus leptophis. (2) Flowering plant of A. flDgelliformis.. . 218 



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