PROTECTION OF POLLEN FROM RAIN 435 



lily of the valley and the flowers of the blueberry, huckleberry, 

 wintergreen, and a multitude of others. Often, in two-lipped 

 flowers, the anthers are more or less completely covered by 

 the upper lip (Fig. 331). In the salver-shaped flowers, such as 

 those of phlox, the mouth of the corolla tube is often so narrow 

 that no rain or dew can enter it. Many corollas of the same 

 general type as that of the sweet pea (Fig. 126) have the stamens 

 covered by certain petals. A large number of flowers, such as 

 the crocus, rose, pond lily, magnolia, and many heads, such as 

 those of the dandelion, the chicory, and the hawkvveed, close in 

 wet weather and open in the sunshine. Sometimes the flower 

 both changes its position and closes, as is the case with the 

 common cranesbill, the herb Robert, and the sweet scabious 

 (Fig. 335). In the linden and the jewelweed the flowers are 

 covered by the foliage leaves of the plant so that rain can hardly 

 ever enter them. 



