Bui. 31, U. S. Dept. of Agriculture. 



Plate VIII. 



Fig. 1 .—The Form of Seedling in a Mexican Highland Species 

 of Prickly Pear. 



Fig. 2.— The Spineless and Mexican Highland Species of Prickly Pear Wilted 

 by Lack of Water at Chico, Cal. 



SPINELESS AND MEXICAN SPECIES OF OPUNTIA. 



