HIGHER GROUPS 159 
207. For our own convenience we group similar species 
into genera. Thus we group all the species of oaks into 
one genus Quercus, the old Latin name for all the Oaks, 
and in like manner all the Elms are grouped under Ulmus, 
the Latin name for the Elms. So we have Quercus alba, 
Quercus rubra, Quercus nigra, etc., and Ulmus americana, 
Ulmus fulva, Ulmus racemosa, ete., in all of which cases 
the first name is that of the genus, and the second that of 
the species and these constitute the names of these plants. 
The name of the plant comes thus from its classification. 
HicHER GROUPS 
208. For further convenience all genera are gathered 
into their appropriate families, all families into orders, all 
orders into classes, and finally all classes into phyla. 
Lastly all the kinds of plants in the world are said to con- 
stitute the Vegetable Kingdom. ° 
We may arrange these as follows: 
Species consist of individual plants 
‘Genera are composed of species 
Families are collections of genera 
Orders are collections of families 
Classes are collections of orders 
Phyla are collections of classes 
The vegetable kingdom is a collection 
of phyla. 
From this it follows that: 
Every plant belongs to some species 
Every species to some genus 
Every genus to some family 
Every family to some order 
Every order to some class 
Every class to some phylum 
All phyla to the Vegetable Kingdom. 
