XX111 
49. Ericaceae. 
50. Pyrolaceae. 
51. Monotropaceae. 
52. Aquifoliaceae. 
53. Oleaceae. 
54. Apocynaceae. 
55. Gentianaceae. 
68. Amaranthacese. 
69. Chenopocliaceae. 
70. Scleranthaceae. 
71. Polygon aceae. 
72. Thymelaceae. 
73. Santalaceae. 
74. Aristolochiaceae. 
CoROLLIFLORjE. 
56. Polemoniaceae. 
57. Convolvulaccac. 
58. Boraginaceae. 
59. Solanaceae. 
60. Orobanchaceae. 
61. Scrophulariaceae. 
MoNOCHLAMYDEiE. 
75. Empctracefr. 
76. Euphorbiaceae. 
77. Callitrichacear. 
78. Ceratophyllaceae. 
79. Urticacea*. 
80. Ulmaceac. 
ENDOGENS. 
62. Labiatae. 
63. Yerbenaceae. 
64. Lentibulariaceae. 
65. Primulaceae. 
66. Plumbaginaceae. 
67. Plantaginaceae. 
81. Elaeagnaceae, 
82. Myricacea-. 
83. Betulaceae. 
84. Salicaceae. 
85. Cupuliferae. 
86. Coniferae. 
DlCTYOGENiE. 
87. Dioscoreace:r. 88. Trilliaceae. 
89. Ilydrocharidaceae. 
90. Orchidaceae. 
91. Iridaceae. 
92. Amaryllidaceae. 
93. Liliaceae. 
94. Melanthaceae. 
Floride^e. 
95. Restiaceoe. 
96. Juncaceae. 
97- Butomace.e. 
98. Alismaceae. 
99. Juncaginaceae. 
100. Typhaceae. 
101. Araceae. 
102. Orontiaceae, 
103. Pistiaceae. 
104. Naiadaceae. 
Glumifer.e. 
105. Cyperaceae. 106. Gramineae. 
Plants being arranged under the Natural System according to 
general characters only, some genera of certain orders will be found 
to possess tbe structural form of a different subclass to that in 
which the order is placed. For instance, though most Leguminosse 
have petals and stamens arranged in the manner characteristic of 
the subclass Calyciflorse, some exotic plants of that order have no 
floral envelope, and would therefore he referred to Monochlamydese 
by the inexperienced student, while a few British species having 
hypogynous stamens would seem to be naturally placed in the 
Thalamifloral division. To avoid the confusion thus arising, a more 
