ARTIFICIAL KEY TO THE NATURAL ORDERS. 
303 
32 Stamens perigynous. The Rose Tr., RosACEiE, 445 
Stamens hypogynous 23 
23 Calyx in a broken whorl. The Tutsan Tr., Hypericace^, 417 
Calyx in a perfect whorl 24 
24 Acrid nauseous herbs. The Crowfoot Tr., Ranunculace^, 400 
Aromatic shrubs or trees. The Anona Tr., AnonacbjB, 402 
26 Fruit one-celled 26 
Fruit many-celled 27 
26 Ovary stalked. Sap watery. The Caper Tr., Capparidace^, 412 
Ovary sessile. Sap milky. The Poppy Tr., PapaveracejE, 409 
27 Placentas spread over the dissep. The Water Lily Tr., Nymphacace^, 407 
Placentas in the axis of the fruit 28 
28 Stigma large broad and peltate. The Sidesaddle Tr., Sarraceniace^, 408 
Stigma small and simple 29 
29 Ovary one-celled. The Purslane Tr., Portulacace^, 419 
Ovary many-celled 30 
30 Calyx tubular, furrowed. Stamens perigynous. The Lythrum Tr., Salicace^e, 525 
Calyx of three or five leaves in a broken whorl. Stamens hypogynous. 
The Rock Rose Tr., Cistace-S), 416 
31 Ovary more or less inferior 32 
Ovary entirely superior. 44 
32 Leaves with stipules ....33 
Leaves without any stipules 34 
S3 Flowers unisexual. The Begonia Tr. Tropical plants, 
belonging to the family, Cucurbitace^, 458 
Flowers bisexual. The Buckthorn Tr., RnAMNACEiE, 441 
34 Placentas parietal 35 
Placentas in the axis 36 
85 Flowers unisexual. The Gourd Tr., Cucurbitace^, 458 
Flowers bisexual. The Currant Tr., GROSSULACEiB, 454 
36 Flowers in umbels. The Umbelli/erotis Tr., Umbellifer^, 462 
Flowers not in umbels 37 
37 Carpels solitary. Combretum Tr. Tropical plants, allied to the Myrtle family, 
Carpels more than one 38 
38 Carpels divaricating at point. The Saxifrage Tr., Saxifragace^, 460 
Carpels quite parallel and united 39 
39 Estivation of calyx valvate 40 
Estivation of calyx imbricated 42 
40 Fruit many-seeded. The Evening Primrose Tr., Onograce^, 451 
Fruit very few-seeded 41 
41 Stamens opposite the petals. The Buckthorn Tr., Rhamnace^e, 441 
Stamens alternate with the petals. The Dogwood Tr., Cornace^, 464 
42 Leaves dotted. The Myrtle Tr., Myrtace^, 447 
Leaves not dotted 43 
43 Stamens doubled down in flower-bud. The Melaetoma Tr., Melastomace^, 448 
Stamens erect. The Escallonia Tr., allied with Saxifragace^, 460 
44 Leaves with stipules 45 
Leaves without stipules 60 
45 Carpels distinct or solitary 46 
Carpels consolidated 48 
46 Anthers with recurved valves. The Barberry Tr., BEBBERiDACBiB, 404 
Anthers with longitudinal valves 47 
