Illustrations

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Plate 9.

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Plate 26 Plate 27 Plate 28

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Cactus Desert in Arizona Frontispiece

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

Pereskia sacharosa (5) Proliferous fruit of Pereskia sacharosa 10

1) Flowering branch of Pereskia grandifolia. (2) Leafy branch of Pereskiopsis chapistle. (3) Leafy branch of Pereskiopsis pititache 20

1) Upper part of flowering joint of Nopalea cochenillifera. (2) Upper part of flowering joint of

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

Nopalea auberi as it grows near Mitla, Mexico 38

1 and 2) Branch of Opuntia mortolensis. (3 and 4) Branch of Opuntia leptocaulis. (5) Flowering branch of Opuntia arbuscula. (6) Flowering branch of Opuntia kleiniae 48

1) 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 50

1) Type plant of Opuntia vivipara, near Tucson, Arizona. (2) A much branched plant of Opuntia versicolor 52

1) Joint of Opuntia tetracantha. (2, 3, 4, 5) Flowering joint of Opuntia versicolor. (6) Proliferous fruits of Opuntia fulgida 54

1) Joint of Opuntia tunicata. (2, 3, 4, 5) Joint of Opuntia spinosior 66

1) Leafy branch of Opuntia imbricata. (2) Flowering branch of Opuntia prolifera. (3, 4) Form of

Opuntia alcahes. (5, 6) Opuntia vestita 68

1) Clump of plants of Opuntia fulgida. (2) A very open plant of Opuntia spinosior 70

1) 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

1) Flowering branch of Opuntia burrageana. (2) Opuntia cylindrica. (3, 4) Joint of Opuntia stanlyi.

(5) Flowering joint of Opuntia macrorhiza 78

1, 2) Part of joint of Opuntia exaltata. (3) Upper part of joint of Opuntia macrarthra. (4) Upper part of joint of Opuntia tortispina 80

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

Opuntia ignescens 98

1) Joint of Opuntia pascoensis. (2) Joints of Opuntia taylori. (3, 4) Form of Opuntia repens.

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

1) 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

1) 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

1) Flowering joint of Opuntia decumbens. (2) Fruiting joint of Opuntia decumbens. (3) Hybrid 116 Group of hardy Opuntia, mostly Opuntia tortispina, in grounds of New York Botanical Garden. . . 126 1) 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

1) Flowering joint of Opuntia fuscoatra. (2) Upper part of joint of Opuntia sulphurea. (3) Joint of Opuntia tenuispina 132

1) Plant of Opuntia santa-rita. (2) Plant of Opuntia discata 142

1) Flowering joint of Opuntia atrispina. (2) Flowering joint of Opuntia phaeacantha. (3) Upper part of joint of Opuntia engelmannii 144

1) Flowering joint of Opuntia bergeriana. (2) Flowering joint of Opuntia elatior. (3) Flowering joint of Opuntia boldinghii. (4, 5) Joint of Opuntia elata 152

1) Upper part of fruiting joint of Opuntia schumannii. (2) Flower of Opuntia schumannii. (3)

Flowering joint of Opuntia vulgaris. (4) Flowering joint of Opuntia stricta 156

1) Flowering joint of Opuntia laevis. (2) Flowering joint of Opuntia dillenii. (3) Upper part of flowering joint of Opuntia aciculata 160

1) View of Opuntia keyensis. (2) View of Opuntia dillenii 162

Flowering joint of Opuntia linguiformis 164

Flowering joints of Opuntia lindheimeri. (1) Orange-flowered race. (2) Red-flowered race 166

1) Upper part of flowering joint of Opuntia leptocarpa. (2) Fruit of Opuntia leptocarpa. (3) Flowering joint of Opuntia velutina. (4) Upper part of joint of Opuntia megacantha 172

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

Flowering branch of Opuntia brasiliensis. (4) Joint of Grusonia bradtiana 174

1) Part of joint of Opuntia leucotricha. (2) Part of joint of Opuntia maxima. (3) Joint of Opuntia lasiacantha. (4) Joint of Opuntia robusta 180

1) Plant of Opuntia fragilis. (2) Flowering branch of Opuntia rhodantha. (3) Flowering joint of

Opuntia polyacantha 194

1) Flowering joint of Opuntia spinosissima. (2, 3) Single flower of Opuntia spinosissima. (4, 5) Longitudinal section of flower of Opuntia spinosissima. (6) Cross-section of ovary of Opuntia spinosissima. (7) Style of Opuntia spinosissima 204

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