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 and fruit 
outrank others because they are more constant, since they 
vary less 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 has 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 soon. Putina tabular form, 
some of the sub-divisions of the Rose family are as follows: 
Peach species (many varieties). 
Garden plum species (many varieties). 
Wild black cherry species. 
Garden red cherry species (many varieties). 
Plum genus 
( 
Dwarf wild rose 
species. 
Sweet-brier species. 
Rose genus 
Tea variety. . 
India rose species F 
Pompon variety, ete. 
Seckel variety. 
Bartlett variety. 
Sheldon variety, ete. 
Pear species 
Damask rose species. 
Pear genus | 
< 
The Rose family includes (among many others) : 
Greening variety. 
Bellflower variety. 
Northern Spy variety, 
ete. : 
| Baldwin variety. 
L 
Apple species 
