M Mammillaria Genus, 33, 34-36, 37, 40-44, 45-46, 47-48, 49-50, 52-58, 60-61 _fasciculata_, 40, 52 _Grahamii_, 41, 54 growth of, 34-36 habitats of, 46-47 how to identify and how to grow, 47-48 _Johnstonii_, 40, 53 _MacDougalii_, 37, 49-50 _Mainæ_, 42, 56 _Milleri_, 45, 61 _Olivæ_, 43, 57 _tetrancistera_, 45, 60 _Thornberi_, 40, 52 _viridiflora_, 43, 57-58 _Wilcoxii_, 41, 55 Many Colored Tree Cholla, 130-32, 135, 145-46 Many Hooked Visnagita, 163, 178 Mexican Fruit Cactus, 165, 181 Mexican Lime Cactus, 165, 181-82 Mexican Night Blooming Cereus, 8, 23-24 Mojave Hedgehog, 65, 76 Mound Cactus, 164, 180 N Nigger Head, 159, 160-61, 174-75 Night Blooming Cereus, 12-15, 25-26 Nopals, 106 _Nyctocereus serpentinus_, 8 O Old Man Cactus, 6-7, 21-22 _Opuntia_ Genus (Cholla), 89, 93, 119-52 _acanthocarpa_, 127, 143-44 _arbuscula_, 128, 133, 147 _Bigelovii_, 129, 144-45 _fulgida_, 136, 138, 149-50 growth and habitats, 120-25 how to identify and how to grow, 140-41 _leptocaulis_, 127, 128, 142-43 _Parryi_, 126, 141-42 _spinosior_, 134, 148 _Stanlyi_, 137, 138, 150-51 _tetracantha_, 131, 132, 146 _Thornberi_, 133, 135, 148 _versicolor_, 130-32, 135, 145-46 _Whipplei_, 93, 137, 151-52 _Opuntia_ Genus (Prickly Pears), 89-118 _basilaris_, 100, 115 _Blakeana_, 90-91, 107-108 _chlorotica_, 103, 116-17 _Covillei_, 101-103, 116 _delicata_, 91-92, 108-109 _discata_, 97-99, 113 _Engelmannii_, 99, 113-14 growth and habitat, 89-90, 120-21, 123-25 how to identify and how to grow, 106-107 _hystricina_, 104-106, 117-18 _laevis_, 94-95, 110 _linguiformis_, 96, 112 _macrocentra_, 100, 105, 114-15 _santa rita_, 92-94, 109-10 _Toumeyi_, 95-96, 111 P Papago Fruit Cactus, 90-91, 107-108 Pincushion Cacti, 33, 34-61, 123 Pineapple Cactus, 51-52 Pink-Flowered Visnagita, 161, 175-76 Pipe Organ Cactus, 7-8, 22-23 Pitahaya, 7, 22-23 Pitahaya dulce, 8 Platopuntia, 106, 120 Popular Cholla, 131, 132, 146 Porcupine Prickly Pear, 104-106, 117-18 Prickly Pear Cacti, 89-118, 120-21, 124-25 Prohibition Cactus, 5-6, 21 Prolific Tree Cholla, 128, 133, 147 Purple Prickly Pear, 92-94, 109-10 Purple Spined Visnagita, 156, 170-71 Q Queen of Night, 8, 14, 25-26 R Rainbow Cactus, 70, 83-85 Recurved Spine Pincushion, 38, 50-51 Reina de Noche, 8, 14, 23-24, 25-26 _Rhipsalis_ Genus, 27 Rose’s Hedgehog Cactus, 68, 81-82