ILLUSTRATIONS. 



PLATES 



20 



FACING 

 PAGE 



PLATE I. Cactus Desert in Arizona r^'V'-"- V-' ' }\ t' ' V V ^'Tf^'^''^ 



Plate 2. (i) Flowering branch of Pereskia pereskia. (2 and 3) Fruit of Pereskia pereskia. (4) Leafy branch of 



Pereskia sacharosa (5) ProHferous fruit of Pereskia sacharosa 10 



Plate 3. (0 Flowering branch of Pereskia grandifoUa. (2) Leafy branch of Pereskiopsis chapistle. (3) Leafy 



branch of Pereskiopsis pititache '. 



Plate 4. (0 Upper part of flowering joint of Nopalea cocheniUifera. (2) Upper part of flowering joint of 



Nopalea auberi. (3) Fruit of Nopalea auberi. (4) Flowering joint of Nopalea dejecta 34 



Plate 5. Nopalea auberi as it grows near Mitla, Mexico • - • 3^ 



Plate 6. (i and 2) Branch of Opuntia mortolensis. (3 and 4) Branch of Opuntialeptocaulis. (5) Flowering 



branch of Opuntia arbuscula. (6) Flowering branch of Opuntia kleiniae 48 



Plate 7. (0 Leafy branch of Opuntia kleiniae. (2) Terminal branch of Opuntia vivipara. (3) Branch of 



Opuntia parryi. (4) Flowering branch of Opuntia echinocarpa. (5) Fruiting branch of 



Opuntia versicolor 5o 



Plate 8. (i) Type plant of Opuntia vivipara, near Tucson, Arizona. (2) A much branched plant of Opuntia 



versicolor 52 



Plate 9. (i) Joint of Opuntia tetracantha. (2, 3, 4, 5) Flowering joint of Opuntia versicolor. (6) Proliferous 



fruits of Opuntia fulgida 54 



Plate 10. (i) Joint of Opuntia tunicata. (2, 3, 4, 5) Joint of Opuntia spinosior 66 



Plate ii. (i) Leafy branch of Opuntia imbricata. (2) Flowering branch of Opuntia prolifera. (3, 4) Form of 



Opuntia alcahes. (5, 6) Opuntia vestita 68 



Plate 12. (i) Clump of plants of Opuntia fulgida. (2) A very open plant of Opuntia spinosior 70 



Plate 13. (i) Opuntia exaltata as seen in the highlands of Peru. (2) Clump of Opuntia floccosa as it grows in 



the valleys of the Andes of eastern Peru 76 



Plate 14. (i) Flowering branch of Opuntia burrageana. (2) Opuntia cylindrica. (3, 4) Joint of Opuntia stanlyi. 



(5) Flowering joint of Opuntia macrorhiza 78 



Plate 15. (i, 2) Part of joint of Opuntia exaltata. (3) Upper part of joint of Opuntia macrarthra. (4) Upper 



part of joint of Opuntia tortispina 80 



Plate 16. (i) Top of Opuntia miquelii. (2) Old and young joints of Opuntia invicta. (3) Upper part of joint 



of Opuntia ignescens 98 



Plate 17. (0 Joint of Opuntia pascoensis. (2) Joints of Opuntia taylori. (3, 4) Form of Opuntia repen?. 



(5) Flower of Opuntia repens. (6) Flowering joint of Opuntia drummondii 102 



Plate 18. (i) Two plants of Opuntia drummondii. (2) Joints of Opuntia retrorsa with flower. (3) Joints of 



Opuntia triacantha. (4) Joint of Opuntia jamaicensis. (5) Section of fruit of Opuntia 



jamaicensis * 104 



Plate 19. (0 Plant of Opuntia jamaicensis. (2, 3) Flower of Opuntia jamaicensis. (4) Longitudinal section 



of flower^ of Opuntia jamaicensis. (5, 6) Stamen of Opuntia jamaicensis. (7) Style of 

 Opuntia jamaicensis 112 



Plate 20. (i) Flowering joint of Opuntia decumbens. (2) Fruiting joint of Opuntia decumbens. (3) Hybrid 116 



Plate 21. Group of hardy Opuntia, mostly Opuntia tortispina, in grounds of New York Botanical Garden 126 



Plate 22. (i) Joints of Opuntia microdasys. (2) Flowering joint of Opuntia macrarthra. (3) Fruit of Opuntia 



macrarthra. (4) Seed of Opuntia macrarthra. (5) Flowering joint of Opuntia opuntia 128 



Plate 23. (i) Flowering joint of Opuntia fuscoatra. (2) Upper part of joint of Opuntia sulphurea. (3) Joint 



of Opuntia tenuispina 132 



Plate 24. (i) Plant of Opuntia santa-rita. (2) Plant of Opuntia discata 142 



Plate 25. (i) Flowering joint of Opuntia atrispina. (2) Flowering joint of Opuntia phaeacantha. (3) Upper 



part of -joint of Opuntia engelmannii 144 



Plate 26. (i) Flowering joint of Opuntia bcrgeriana. (2) Flowering joint of Opuntia elatior. (3) Flowering 



jomt of Opuntia boldinghii. (4, 5) Joint of Opuntia clata 152 



Plate 27. (i) Upper part of fruiting joint of Opuntia schumannii. (2) Flower of Opuntia schumannii. (3) 



-, o . N T^i ^^^^'^""S J^^^t of Opuntia vulgaris. (4) Flowering joint of Opuntia stricta 156 



1 LATE 28. (I) Flowenng jomt of Opuntia lae^is. (2) Flowering joint of Opuntia dilleuii. (3) Upper part of 



flowering jomt of Opuntia aciculata 160 



Plate 29. (i) View of Opuntia keyensis. (2) View of Opuntia dillenii 162 



Plate 30. I-lowenng joint of Opuntia hnguiformis 164 



Plate 31. Flowering joints of Opuntia hndhcimeri. (i) Orange-flowered race.' * (2) Red-flowered race! V/////. 166 

 1 LATE 32. U) Upper part of flowenng joint of Opuntia leptocarpa. (2) Fruit of Opuntia leptocarpa. (3) Flower- 



Pr .rr^ f ^ TT '""^ ^""''^^ . Opuutia velutina. (4) Upper part of joint of Opuntia megacantha 172 



1 I.ATE 33. (I) Upper part of joint of Opuntia tomentosa. (2) Flowering joint of Opuntia brasiliensis. (3) 



P, .ru.. r ^ P Flowenng branch of Opuntia brasihensis. (4) Joint of Grusonia bradtiana 174 



ILATL34- (0 Part of jomt of Opuntia leueotricha. (2) Part of joint of Opuntia maxima. (3) Joint of Opuntia 



lastacantha. (4) Jomt of Opuntia robusta. ... 180 



1 1.ATE 35. (0 Plant of Opuntia fragilis. (2) Flowering branch of Opuntia rhoclantha.' ' (3) Flowering joint of 



Opuntia polyacantha 



Plate 36. (i) Flowering joint of Opuntia spinosissima/ '(2V3) Single flower oVopuntia'spinosissima." * (4/ 5) 



Onnnt '•'^- '''' ""[ ^'''' ^^ ^^"^^'^ spiuosissima. (6) Cross-section of ovary of 

 Opuntia spinosissima. (7) Style of Opuntia spinosissima 204 



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