ARTIFICIAL KEY TO THE NATURAL ORDERS. 
805 
70 Hypogynous, disk large 71 
Hypogynous, disk absent 72 
71 Ovary stalked. The Caper Tr., Capparidace^, 412 
Ovary sessile. The Mignonette Tr., Resedace^, 413 
72 Calyx 5-leaved. The Turnera Tr., tropical plants, allied to Loasace^, 455 
Calyx 3 or 4-leaved. The Poppy Tr., Papavabacb^, 409 
73 Placentas covering the dissep. The Water Lily Tr., NymphaCACEJI, 407 
Placentas confined to the axis ..74 
74 Styles distinct to the base 75 
Styles consolidated 80 
75 Calyx in a broken whorl 76 
Calyx in a perfect whorl 77 
76 Stamens in several parcels. The Tutsan Tr., allied to Hyperice^, 417 
Stamens in a perfect whorl (monadelphoua). Flax Tr., Linages, 430 
77 Carpels each subtended by an hypogynous scale. 
The Houseleek Tr., Crassulace^, 459 
Carpels scaleless 78 
78 Carpels 2, divaricating at end. The Saxifrage Tr., Saxifragace-E, 460 
Carpels more than two, often with a free central placenta 79 
79 Calyx tubular. The Catchfiy or Pink Tr., in Caryophyllace^, 418 
Calyx 5, or 4-parted. The Ghickweed Tr., in Caryophyllace^, 418 
80 Estivation of calyx imbricated 81 
Estivation of calyx valvate or open..96 
81 Sepals in a broken whorl 82 
Sepals in a complete whorl 85 
82 Fruit splitting into valves. 
The Horsecheanut Tr., HoppocastancB in Sapindace^, 458 
Fruit not splitting 83 
83 Calyx papilionaceous. The Milkwort Tr., Polygalace^, 443 
Calyx uniform 84 
84 Petals without appendages. The Maple Tr., Acerace^, 437 
Petals with appendages. The Soap Tr., SapindacEjE, 438 
86 Flowers unisexual 86 
Flowers bisexual 87 
86 Leaves dotted. The Yellowwood Tr., Cedrelace^, 426 
Leaves heath-like and dotless. The Crowherry Tr., Empetrace^, 520 
87 Leaves dotted 88 
Leaves not dotted 89 
88 Fruit a dry capsule. The Rue Tr., Rutace^, 
Fruit a succulent berry. The Orange Tr., Aurantace^, 
89 Flowers irregular. The Balaam Tr.^ Balsaminace^, 
Flowers regular 90 
90 Carpels four or more 91 
Carpels fewer than four 93 
91 Ovary 5-parted. The Limnanthe Tr., in Tropoeolacece, 428 
Ovary undivided 92 
92 Stamens distinct. The Heath Tr., Ericackje, 475 
Stamens monadelphous. The Bead-tree Tr., or Melia, Meliacejs, 425 
93 Calyx with two sepals. The Purslane Tr., Portdlacace^, 419 
Calyx with more than two sepals 94 
94 Stamens hypogynous 95 
Stamens perigynous. The Celastrua Tr., Celastracb^, 410 
