THE CLASSIFICATION OF PLANTS. 



215 



others, Combine to make up the Crowfoot family. In deter- 

 mining the classification of plants most points of structure 

 are important, but the characteristics of the flower antj fruit 

 outrank others because they are more constant, since they 

 vary lesp rapidly than the characteristics of roots, stems, 

 and leaves do under changed conditions of soil, climate, or 

 other surrounding circumstances. Mere size or habit of 

 growth lias nothing to do with the matter, so that the 

 botanist finds no difficulty in recognizing the strawberry 

 plant and the apple tree as members of the same family. 



This family affords excellent illustrations of the meaning 

 of the terms genus, species, and so on. Put in a tabular form, 

 some of the sub-divisions of the Eose family are as follows : 



I 



T3 



tf 



O 



Plum genus 



Rose genus 



Pear genus 



Peach species (many varieties). 



Garden plum species (many varieties). 



Wild black cherry species. 



Garden red cherry species (many varieties). 



Dwarf wild rose 



species. 

 Sweet-brier species.' 



India rose species 

 Damask rose species. 



Pear species 



Tea variety. 

 Pompon variety, etc. 



Apple species 



Seckel variety. 

 Bartlett variety. 

 , Sheldon variety, etc. 



Baldwin variety. 

 Greening variety. 

 Bellflower variety. 

 Northern Spy variety, 

 etc. 



