LINN/EAN ARTIFICIAL SYSTEM. 169 



class has also an order polyadelphia ; but as the plants arranged in 

 these orders possess the true moncecious and dioecious character, a 

 careful observer will find no difficulty in knowing to what class his 

 plant may belong. The orders of the three classes monadelphia, dia- 

 delphia and polyadelphia, are very simple and readily ascertained. 



10. If the anthers are united with each other, so as to 

 form a tube through which the pistil passes, or that the 

 flowers are compound, your plant belongs to the nine- 

 teenth class syngenesia. (F. 5.) 



The plants which constitute this class are generally compound, 

 and the exact order to which any plant may belong, is readily dis- 

 covered by referring to the construction or foundation of the orders. 



11. If the stamens arise from any part of the pistil, or 

 from a pedicle or column elevating the pistil, the plant 

 is then of the twentieth class, or gynandria. (F. 192.) 



The particular origin of the filament will very effectually prove 

 the certainty of the plant being of this class, and the respective 

 orders may also be attained with very little trouble. 



FIFTH DIVISION. 



12. Plants not corresponding to any of the divi- 

 sions we have mentioned, carefully examine whether 

 they are not of the fifth division, that is, whether they 

 produce flowers with stamens only, and flowers with 

 pistils only, and with both. 



The plants of this division are said to have united or perfect Jlotvers, 

 when they have both stamens and pistils inclosed within the same 

 corolla : separated flowers when their stamens are in one flower 

 called the barren flower, and their pistils in another, called the fertile 

 flower. But if a plant bears united flowers, as well as barren or 

 fertile flowers, the plant is said to have mixed flowers. 



