Some Families of Angiosperms 



541 



tend to be grouped at the ends of the branches. They are con- 

 fined to acid soils, and many are found in bogs. The azaleas, 



U.S. Forest Servicz 



Fig. 347. Mesquite {Prosopis julifiora), a widely dis- 

 tributed shrub in the Southwestern states, belonging 

 to the legume family. (See Figure 240.) 



rhododendrons, laurels, arbutus, heather, huckleberries, blue- 

 berries, cranberries, and wintergreen are examples of both the 

 ornamental and fruit-producing members of this family. 



The flowers usually have five parts in each whorl, and the 

 corolla differs from that of all the preceding families in showing a 

 tendency to have the petals united. In the succeeding famihes 

 this tendency culminates in the production of tube-like corollas. 



The mint family (Labiatae). The corolla of the mints is tu- 

 bular, and frequently two-lipped, which suggested the technical 

 name. They are world-wide in their distribution, and they num- 



