LINNffiAN ARTIFICIAL SYSTEM. 167 



if it does not belong to one of the three classes es- 

 tablished on the number and insertion of the stamens. 



4. Does the plant produce flowers with twelve to 

 nineteen stamens fixed to the receptacle? (F. 184.) If 

 it does, you must consult the eleventh 'class or dode- 

 candria. If there are more than twenty stamens at- 

 tached to the calyx (F. 185.) or corolla, to the class 

 icosandria. But if there are more than nineteen stamens, 

 inserted into the receptacle, (F. 186.) then the plant must 

 belong to the thirteenth class, or polyandria. 



These classes are simple in their characteristics, and the orders 

 into which they are divided being founded on the number of pistils 

 in each flower, they are soon made familiar. 



The class monadelphia has an order polyandria ; the class poly 

 adelphia, an order dodecandria, icosandria, and polyandria : and 

 the classes monoecia and disecia have both an order polyandria. But 

 as the essential qualities of either of these classes are not present in 

 plants of the second division, very little confusion can result to an 

 accurate observer. 



THIRD DIVISION. 



5. We have already given rules for investigating 

 plants which belong to those classes founded on the 

 number and insertion of the stamens ; we will now 

 speak of those which are founded on their number and 

 proportion. 



We shall hereafter hear, that the filaments of the stamens may be 

 united, but we have now to know that the filaments of the first 

 fifteen classes of the system, are separate and distinct. 



6. If the flowers of your plant should have/owr sta- 

 mens, two long and two short, the fourteenth class or 

 'didymmia would be indicated. (F. 187). 



