Circular No. 66, U. S. Dept. of Agricult 



Plate 6 



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A.—Echinocactus grusoni with Echinopsis (urbinata (gemmata) on either side. A. S. White Park, 

 Riverside, Calif., 1904. B— Gathering the pulp of tuna cardona fruits (Opuntia streptacantha) . 

 State of Zacatecas, Mexico, 1905 



