CLASSES. 



Strawberry, and other fruits. The Rose is an exam- 

 ple ; also, the Five-finger and Avens, which have not 

 pulpy fruits. 



Observation. 1. A natural class.* 



2. The stamens are often inserted so near the receptacle as to 

 resemble the next class, but the student will generally distinguish 

 it by a polished groove, which runs around between the insertion 

 of the stamens and the insertion of the pistils. 



IS. POI.YANDRIA, stamens more than 20, inserted in~ 

 to the receptacle. Ex. Poppy, Papaver ; Buttercup, 

 Ranunculus. 



Observation. A numerous class, very distinct in nature, as well 

 as character, from those of Icosandria. 



By Proportion. 



14. DIDYNAMIA, stamens 2 long and 2 short. Ex. 

 Motherwort, Leonurus ; Mint, Mentha. 



Observation This is a natural class, and contains most of the 

 ringent and personate flowers. Some plants with ringent flowers 

 want two of the stamens, and therefore are placed in the 2d class, 

 JJiandria. Penny-royal, Cunilla / Sage, Salvia / and Water-hore- 

 hound, Lycopus, are examples. 



15. TETRADYNAMIA, stamens 4 long and 2 short. 

 Ex. Stock, Radish, Mustard, Cabbage. 



Observation. A very natural class, comprehending all the era* 

 eiforrn flowers. 



By Union of the Filaments. 



16. MONADEI.PHIA, stamens united more or less ex- 

 tensively into one tube. Ex. Mallow, JMalva. 



17. DIADELPHIA, stamens united into two parcels. 

 Ex. Pea, Bean. 



Observation This class consists of Popilionaceous flowers, and 

 is therefore natural, 



18. POI.YADELPHIA, stamens united into more than 

 two parcels. Ex. St. John's wort. 



Observation. A small class ; in some points related to Icos- 

 andria. 



* A class or order is said to be natural, when all the genera which compose it have 

 & degree of resemblance to each other, or, in other words, are allied by affinities. 



