xxvm 
KEY TO THE NATURAE ORDERS. 
65. Primulace.e. Stamens opposite the petals. Fruit dry, 1-celled. Style 1. 
66. Plumbagi.yace.e. Fruit dry, 1-celled. Seed 1. Styles 5. 
57. ConvolvulacejE. Stamens alternate with the petals. Fruit dry, 1- or 2-cellecL 
Seeds few. Style 1. 
55. Gentianace.e. Stamens alternate with the petals. Fruit dry, 1- or 2-celled, 
many-seeded. Leaves opposite. 
59. Solanace.e. Stamens alternate with the petals. Fruit dry, 2-celled, or nearly 
4-celled, many-seeded. Leaves alternate. 
56. PoLEMONiACEiE. Fruit dry, 3-celled. 
51. Monotropace.e. Fruit dry, 4- or 5-celled. Plant scaly, leafless. 
Floral envelope (calyx) single or wanting. 
A. Barren and fertile flowers in catkins. 
82. Myricace.e. Monoecious or dioecious. Fruit a succulent drupe. 
83. Betulace.e. Fruit dry. Monoecious. 
84. Salicace.e. Fruit dry. Dioecious. 
B. Barren flowers only, in catkins. 
81. Eleagnace.e. Ovary superior. Dioecious. 
85. CuruuFERiE. Ovary inferior. Monoecious. 
86. Conifer.e. Seed in cones, or surrounded by a fleshy involucrum. Leaves 
linear, needle-like. 
C. Flowers not in catkins. 
40. Loran’tiiacea:. An evergreen parasitic shrub. 
76. Eupiiorbiace.e. Flowers in terminal clusters, surrounded by bracts. Ovary 
stalked, with 3 one-seeded cells. Juice milky. 
* Ovary inferior, 
f Cells many-seeded. 
36. Saxifragace.e. Stamens 8-10. Styles 2. 
27. Onagrace.e. Stamens 4. Style 1. 
74. Aristolochiace.e. Stamens 6-12. 
ft Cells 1 -seeded. 
28. Haloragace.e. Leaves whorled. Aquatic. 
73. Santalace.e. Leaves alternate. Terrestrial. 
, ** Ovaries several, superior. 
1. Ranunculace.e. Stamens hypogynous. 
26. Rosace.e. Stamens perigynous. 
*#* Ovary 1, superior, with 2 or more cells. 
t Monoecious or dioecious. 
76. Eupiiorbiace.e. Terrestrial. Fruit capsular, of 2 or 3 one-seeded cells. 
75. E.mpetrace.e. Terrestrial. Fruit fleshy. Stamens 3. 
77. Callitriciiace.e. Aquatic plants. Fruit of 4 one-seeded carpels. 
ft Flowers perfect. 
80. Ulmaceas. Trees. Stamens 5. Fruit dry, winged. 
24. Riiamnace.e. Shrubs. Stamens 4 or 5. Fruit a berry. 
53. Oleace/E. Trees. Stamens 2. 
29. Lytiirace/E. Herbs. 
**** Ovary 1, superior, 1-celled. 
f Calyx coloured and petal-like. 
65. Primulace.e. Leaves without stipules. Stamens 5. 
