CHAPTER X 

 PLANT CLASSIFICATION 



I. COMMON METHODS OF CLASSIFICATION 



165. Herbs, shrubs, and trees. One way of classifying 

 the common plants with which we are most familiar is that 

 of calling them either herbs, shrubs, or trees. This classifica- 



FIG. 78. Base of one of the giant trees of California. (Tarr and McMurry.) 



tion is based upon the general similarity in size, form, and 

 texture of the plants which are assigned to each group. Thus 

 when we think of a tree we have in mind a plant which, when 



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