PLANT COMMUNITIES: SEASONAL CHANGES. 41 1 



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

 blossom, and fruit, for in the same locality there is a succession 

 of different forms, the later ones coming on as the earlier ones 

 disappear. 



722. Seasonal succession in plant communities. The 

 wooded slopes in springtime teem with trillium, dentaria, pod- 

 ophyllum, and other vernal blossoms, while on the steeper hill- 

 sides the early saxifrage is to be found. In the rocky portions 



Fig. 502. 

 Azalea (Rhododendron nudicaulis). 



of the glen, which is also a favorite lodgment for this pretty, 

 white saxifrage, the wild columbine loves to linger and dangle 

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

 moss and fern. On the partly sunlit slopes the clusters of azalea 

 are radiant with blossoms, while here and there the shad-bush, 

 or service-berry (amelanchier), with its mass of white flower- 



