PLANT COMMUNITIES: SEASONAL CHANGES. 329 



In field or forest, along glade or glen, on mountain slope or 

 in desert regions, similar relationships of plants in communities 

 are manifest. The seasons, too, seem to vegetate, blossom, 

 and fruit, for in the same locality there is a succession of differ- 

 ent forms, the later ones coming on as the earlier ones dis- 

 appear. 



496. Seasonal succession in plant communities. — The 

 wooded slopes in springtime teem with trillium, dentaria, 



Fig. 270. 

 Azalea (Rhododendron nudicaulis). 



podophyllum, and other vernal blossoms, while on the steeper 

 hillsides the early saxifrage is to be found. In the rocky por- 

 tions of the glen, which is aiso a favorite lodgment for this 

 prettv, white saxifrage, the wild columbine loves to linger and 

 Jangle its spurred flowers. The lichen-colored ledge is wreathed 



