BRITTON AND ROSE 



PLATE XXXVI 





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L r 



7 



^^A. 



:<^^ 



-i 



/ 



^^. 



t 



^ I 



6 



n - ■ ^ 



H. A. Wood del 



5 



Optiutia spinosissinia 



2 



4 



A ! -f-^ti fci:0 



^ ' . 



■" ^ T 



1. Flowering joint. 



2, 3. Single flowers. 



4. 5. Loneitudinal section of flower. 



6 



Cross-section of ovary* 



\-r 



7. Style. 



