158 LINN*AN ARTIFICIAL SYSTEM. 



flowers with stamens on one plant, andjlotcers with i>istils 

 on another of the same species. (F. 194.) 



The genera of the class dioecia are referred, by Linnaeus, to very 

 different natural orders. Salix, populus, myrica, belong to the order 

 amcntaceef. Juniperus, taxus, ephedra, to the coniferce. Vallis- 

 neria and hydrocharis to the order palnxe. Smilax, tamus, yam, 

 rajania, moon-seed, cissampelos, and butcher's-broom to the sar- 

 mentacees. While carica or papaw -tree, and cliffortia, are arranged 

 in the natural order tricoc ccc. 



150. Division : The class dioecia, like the preceding 

 one, is very variously divided by different writers. Some 

 consider there are fourteen orders, but the number 

 usually admitted, is nine. These are all named and 

 established after the classes. 



151. Monandria : Containing those species of 

 dioecious plants, the barren variety of which, produce 

 flowers with only one stamen. 



The pandanus or screw-pine, and the brosimura or bread-nut- 

 tree, both foreign genera, are to be found in this order. 



152. Diandria: When, instead of producing flowers 

 with only one stamen, they are furnished with tu-o 

 stamens. 



The entensive genus salix or willow, will afford plenty of native 

 examples of the order in question. 



153. Triandria : When the flowers of the barren 

 plant, are furnished with three stamens. 



The genera empetrum or crow-berry, osyris or poet's-cassia, 

 restio or rope-grass, phoenix or date-palm-tree, and a few others, 

 are the constituents of this division. 



