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



Plate I! 



Fiq. 1.— An Opuntia (S. P. I. No. 14807J which is Spiny on One Side and Spineless 

 on the Other. Compare Plate I. 



Fig. 2.— A Practically Spineless Species of Opuntia (O. subarmata>, Native of 

 the Devils River Region of Texas, as Grown at San Antonio. 



SPINY AND ALMOST SPINELESS SPECIES OF OPUNTIA. 



