136 UNNJ.AN ARTIFICIAL SYSTEM. 



not give rise to this class, for here are included all 

 plants which produce flowers with tirelre to nineteen 

 stamens. 



It cannot he asserted, that the class dodecandria is a natural class. 

 The different genera which it contains, have very little natural affi- 

 nity to each other. Asarum is referred to the order sarment acea? ; 

 garcinia and halesiato the order bieonies ; portulaca and house-leek 

 to succulent a ; the vast genus euphorbia, with a numher of other 

 genera, belong to the order tricoccee. 



64. It seems to be the essential character of this 

 class, that the stamens, or in place of them, the anthers, 

 are inserted into the receptacle. (F. 184 ) 



By the place of insertion, we very readily distinguish the plants of 

 the class dodecandria from those of icosandria, for in this last, the 

 stamens are either inserted into, the calyx or into the petals, and from 

 those of the class polyandria, by the number not exceeding nineteen. 



65. Division: The orders of this class are six in 

 number, viz. monogynia, digynin, tripynin, tetragynia, 

 pentapynia, and dodecagynia, all founded on the number 

 of the pistils. 



66, Monogynia : Including, such plants of the class, 

 as bear flowers with one pistil only. 



The European asarabacca, tiee-celandine, snow-drop tree, pur- 

 slane, common lythrum, and other plants may be consulted as illus- 

 trations of this order. 



67. Digynia : Embracing such plants of the class, as 

 bear flowers with two pistils. 

 To this order belengs thr holiocarpus, a very rare American tree. 



