SUCCESSIONS ON CLAY OR CLAY-GRAVEL 



225 



well established on stripland in twenty-five to fifty years after 

 stripping (Fig. 102). 



A sere on an upland clay-gravel area would start in much the 

 same way as the xerarch succession on striplands, the pioneer plants 



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ul"-- 







Fig. 101. — Mixed forest on striplands, Vermilion County, Illinois, twenty-five 



years after stripping. 



Fig. 102.— Sycamore consocies on stripland, twenty-five years after stripping. 



being xeric annual and perennial herbs. These would be followed 

 by a xeric shrub community dominated by such shrubs as the smooth 

 sumach {Rhus glabra), the hazel {Corylus americana), and black- 

 15 



