9<5 AN INTRODUCTION 



ORDER IX. MON A DELPHI A, comprehending such 

 plants as have their male flowers furnished with one 

 set of united stamina. This order contains fifteen 

 genera, viz. Hura, Pinus, Cupressus, Thuja, Aca- 

 lypha, Dalechampia, Plukenetia, Cupania, Croton, 

 Ricinus, Jatropha, Stercuha, Hippomane, Stilimgia, 

 and Gnetum. 



ORDER X. SYNGENESIA, comprehending such 

 plants as have their male flowers furnished with sta- 

 mina of which the antherae are united. This order 

 contains six genera, viz. Trichosanthes, Momordica, 

 Cucurbita, Cucumis,. Bryonia, and Sicyos. 



ORDER XI. GYNANDRIA, comprehending such 

 plants as have their male flowers furnished with sta- 

 mina that grow out of a kind of style, or imperfect 

 pistilium, the perfect one being in the female flower. 

 Of this order there are two genera, viz. Andrachne, 

 and Agyneia. 



CHAP. V. 



OF THE TWENTY-SECOND CLASS DlOECIA . 



THIS Class consists of such plants as have no her- 

 maphrodite flowers, but bear male and female flowers 

 on distinct plants*. The orders of this class are thir- 

 teen, viz. 



* There arc many plants which have male and female flowers 

 on distinct plants; but which are not admitted in this class, 

 because this circumstance happens to one species only, and not 

 to the whole genus. Instances of this are met with in Morns, 

 Urtica, Laurus, Croton, Rumex, Silenc, Carex, Rhus, Valeri- 

 ana, Rhi-mnus and Cucubalus. But it is observable, that in the 

 plants that stand under the first distinction, in the order Aiono- 

 gynia of the class Pentandria, which are the Asperifoliae 

 (rou2jh- leaved plants) of Ray, and also in the plants of the 

 classes Didynamia, Tetradynamia, and Diadelphia, there have 

 not been found any species where the sexes are on distinct 

 rjjants: This may be accounted for from the structure of the 

 Bowers in those classes. 



