CEPAGES. 



171 



Fig.|86. Leaf of Riparia X Rupestris, No. 3309, Couderc. 



Riparia or Rupestris. In calcareous soils, where the two 

 latter species became slightly yellow, some of their hybrids 

 remain green and vigorous when grafted and their grafts 

 are very fructiferous. In the chalky soils of the Char- 

 entes they die, but not so rapidly as the species they are 

 derived from ; in certain groie soils, not too calcareous, certain 

 forms resist chlorosis effectually. In many viticultural 

 regions certain Riparia X Rupestris assume a vigorous 



