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BRITTON AND ROSE 



PLATE XVIII 



i 



^- E. Eaton del. lto3 

 a- A. Wood del. 4, 5 



1. 



2. 



Opuntia 



Joints of OpunHa retrorsa with flower. 4, 5. Joint a 



(All natural size.) 



A. 



3. Joints of Opuntia triacantha. 

 4 5. Joint and section of fruit of Opuntia jamaicensis. 



4 * \ 



CO 



