126 LINNSAN ARTIFICIAL SYSTEM. 



Linnaeus has introduced, as well into the fourth as into the oilier 

 classes of his artificial system, constitute an extensive order of 

 vegetables to which Jussien has given the name of rubiacia:. 



19. Division: The class tetrandria, is divided into 

 three orders ; these are called monogynia, digynia, and 

 tetragynia, from the number of pistils in each flower. 



20. Monogynia: Constituted bj such plants of the 

 class, as bear flowers with but one pistil. 



In this order, there are above a hundred genera, many of which 

 as the protea, banksia, &c. are very magnificent vegetables. The 

 teasel, scabious, plantain, madder, ladies-bed-straw, woodroof, and 

 other genera possessing indigenous species, also belong to this order. 



21. Digynia: Comprehending sucli plants of the 

 class, as bear flowers with two pistils. 



This is but a very small order, containing only two native plants 

 of Britain, which are, the common and lesser dodder. The Vir- 

 ginian witch-hazel, buffmiia, and hypecoum, are also of this ar- 

 rangement, 



22. Tetragynia .-Embracing such plants of the class, 

 as bear flowers with /our pistils. 



The families of the holly, pond- weed, tassel pond-weed, &c. are 

 of this order. Of the first genus, there is only one species, the common 

 holly, a native of this country, but all the species of pond-weed and 

 pearl-wort are indigenous. 



CLASS V. I'ENTANDRIA. 



23. Character: The plants arranged in this class, 

 have^re stamens in each flower, the anthers of which, 

 are either united or separate. (F. 178.) 



