xi ILLUSTRATIONS. 
Facing page. 
Puate 41. A. Fruit of Nymphaea microcarpa Miller & Standley. B. Fruit and 
unopened flower of Nymphaea ludoviciana Miller & Standley.... 92 
42. Seeds of several species of Nymphaea.............0.2.2.00eeeeeee 96 
43. A. Fruit and unopened flower of Nymphaea ulvacea Miller & Stand- 
ley. B. Fruits of Nymphaea ovata Miller & Standley........... 97 
44, A. Flower and fruit of Nymphaea sagittifolia Walt. B. Fruit of 
Nymphaea puberula Miller & Standley..............0.0ceceeeee 99 
45. A. Flower and fruit of Nymphaea orbiculata Small. B. Flower and 
fruit of Nymphaea bombycina Miller & Standley................ 101 
46. Nymphaea polysepala(Engelm.) Greene at Crater Butte, Colorado.. 108 
47. Fruit of Nymphaea polysepala (Engelm.) Greene..............---- 104 
48. Agave neomexicana Wooton & Standley in the Organ Mountains... 116 
49. Eriogonum gypsophilum Wooton & Standley..............-.------ 118 
50. Herrickia horrida Wooton & Standley..................ceceeeeees 187 
51. Fruits of eight species of Meibomia.................-.0.-0eeeeeeee 216 
52. Raimondia monoica Safford............2222. cece cece e cece aeons 218 
53. Raimondia monoica Safford ...... 2.20.2. eee e cece eee cee | ceeee 219 
54, A. Acrostigma equale Cook & Doyle. B. Wettinella quinaria Cook 
& Doyle... 22.2... eee eee cece cece cee cee eeeeeeeees= 230 
55. Acrostigma equale Cook & Doyle. ..-...........eeceeeeeeeceeeces 230 
56. A. Acrostigma equale Cook & Doyle. B. Catostigma radiatum Cook 
& Doyle. OC. Wettinella quinaria Cook & Doyle..............-- 230 
57. Acrostigma equale Cook & Doyle. .........2.2.-.ceeeeceeeeees ~« 230 
58. Acrostigma equale Cook & Doyle. .........-.2..0-eceeeeececceres 230 
59. A. Fruits of Catostigma radiatum Cook & Doyle. B. Fruits of Wet- 
tinella quinaria Cook & Doyle...........2.0..02ceee eee cece --+. 231 
60. Catostigma radiatum Cook & Doyle..........22222222ceeee eee eee 231 
61. Catoblastus pubescens (Karst.) Wendl. and C. praemorsus (Willd.) 
Wendl... 2.2.22 ccc eee cece cece cece ececeerens 232 
62. Flowersand fruit of Catoblastus pubescens (Karst.) Wendl......... 233 
63. A. Wettinia augusta Poepp. & Endl. B. Wettinella quinaria Cook 
& Doyle. ....... 20. lee ec ee ee eee ee ee eeee 235 
64. Wettinella quinaria Cook & Doyle...........22.2222020202 22 eee eee 236 
65. Wettinella quinaria Cook & Doyle. ............2....2.02022222--- 237 
66. Echinocactus alamosanus Britt. & Rose............20.02.0ceee ee ee 239 
67. Echinocereus luteus Britt. & Rose...........202022- 2.2 e eee eee cess 239 
68. Epiphyllum gaillardae Britt. & Rose...........-.--.------2---2----- 240 
69. Hylocereus minutiflorus Britt. & Rose..............--2------+----- 240 
70. Nyctocereus guatemalensis Britt. & Rose............22--22--2-20-- 240 
71. Nyctocereus guatemalensis Britt. & Rose...............-..-------- 240 
72. Opuntia chaffeyi Britt. & Rose........ 0.22 eee eee ee ee ee eee 241 
73. Wittia panamensis Britt. & Rose........ 2222. c eee eee ccc cc eeee 241 
74. Pseudophoenix sargentii Wend]. ..........220.0-0- eee ee eeeeeeeee 246 
75. Pseudophoeniz sargentii Wend1.........2....22- 2-2 e eee cece eee eee 246 
76. Pseudophoenizx sargentit Wend1.........2..22 222 e cece eee ceececes 247 
77. Pseudophoenix sargentii Wendl. ...........2.20- 00 20c cece ececeee 247 
78. Epiphyllum guatemalense Britt. & Rose............---.-0eeeeeeeee 257 
79. Disocactus eichlamii (Weing.) Britt. & Rose..........2---.-e.eeeee 259 
80. Zygocactus truncatus (Haw.) Schum. .........2....22-2-22-2--e0ee 260 
81. Schlumbergera russelliana (Hook.) Britt. & Rose.........-.--.+---- 261 
82. Wittia costaricensis Britt. & Rose...........2-.2.2.eceeeeeeceeees 261 
83. Eccremocactus bradei Britt. & Rose............2 20002 e cece ee ee eee 262 
84. Strophocactus wittit (Schum.) Britt. & Rose........-..----------- 262 
