Bui. 262, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



Plate V. 



Fig. 1.— Opuntia Leucotricha. A. S. White'Park, Riverside, Cal., 1909. 



Fig. 2.— Opuntia Microdasys (in foreground^ A. S. White Park, Riverside, 



Cal., 1909. 



