LINNiEUS. 297 



XVIII. PoLYADELPHiA .* stamcns united into three or 

 more bundles ; as in hypericum and cistus. 



In the next class, the stamens are united by their 

 anthers. 



XIX. Syngenesia : five stamens united by the anthers; 

 as in the dandehon and violet. 



In the twentieth, the pistil and stamen are united. 



XX. Gynandbia : stamens united to the pistil ; as in 

 orchis. 



The plants of all the above classes have flowers 

 furnished with both stamens and pistils ; but in t\ie 

 next three the flowers are unisexual. 



XXI. MoNCEciA : Flowers bearing stamens only, and 

 flowers bearing pistils only, occurring on the same plant ; 

 as in the oak. 



XXII. Dkecia: staraeniferous flowers on one, and 

 pistilliferous flowers on another individual of the same 

 species ; as in willows. 



XXIII. PoLYGAMiA : Flowers bearing stamens and 

 pistils, flowers bearing stamens only, and flowers bearing 

 pistils only, all on the same individual, or on different in- 

 dividuals of the same species ; as in the ash and peUitory. 



The above classes contain all the plants that are 

 Vhoenogamous, or have distinctly perceptible organs 

 of reproduction ; the next and last class is composed 

 of the cryptogamoiis, or those of which the flowers 

 either do not exist, or have not been demonstrated. 



XXIV. Cryptogamia : Ferns, mosses, hchens, sea- 

 weeds, mushrooms, &c 



The orders or subdivisions of the classes are 

 founded on the number of the pistils in the first 

 thirteen. Thus, in any of these classes, the first 



