THE CLASSIFICATION OF PLANTS. 399 



of Corymbiferae, the Ox-eye and Chamomile. In like manner, 

 while we find the Almond, Cherry, Strawberry, Kaspberry, 

 Kose, and Apple, all belonging to the same order Kosaceie, yet 

 some of them have more resemblance than others. Thus the 

 Almond and Cherry have a drupaceous fruit, and belong to a 

 distinct sub-order, Amygdalese ; the Strawberry and Easp- 

 berry are much more ahke each other than they are to the 

 Almond and Cherry, or to the Rose and Apple, hence they are 

 placed in a sub-order called Potentillese; while the Apple 

 again is very different to the Eose, and both are unlike in cer- 

 tain respects to the other genera of the two sub-orders just men- 

 tioned, and hence the Apple is placed in the sub-order PomejE, 

 and the Eose that of Eosese. 



It is found convenient at times to subdivide sub-orders also 

 into Tribes and Sub-tribes, by collecting together into groups 

 certain very nearly allied genera, but it is not necessary for us 

 to illustrate such divisions further, as the principles upon which 

 they depend have been now sufficiently treated of. 



4. Classes. — By a class Ave understand a group of orders which 

 possess some important structural characters in common. Thus 

 we have the classes Monocotyledones, Dicotyledones, and 

 Acotyledones, which present certain distinctive characters in 

 their embryos, from which they derive their names; and such 

 classes present, moreover, other important anatomical differ- 

 ences. 



The Classes are again subdivided into sub-classes and other 

 divisions, in the same manner as the orders are thus subdivided ; 

 but as such divisions vary in different systems, and are all more 

 or less artificial, it is not necessary to dwell upon them further. 

 The more important divisions of plants, and those which are 

 found in all systems of classification, are Classes, Orders, Genera, 

 and Species. 



The following table will include all the groups we have al- 

 luded to ; the more important and those of universal use being 

 indicated by a larger type. 



1. Classes. 



Sub-classes. 

 2. Orders or Fajvultes. 

 Sub -orders. 

 Tribes. 

 Sub-tribes. 

 3. Genera. 



Sub -genera. 

 4. Species. 



Varieties. 



Races or Permanent Varieties. 



