BRITTON AND ROSE 



PLATE XXVII 



M. I- Kuton deT 



1. Upper part of fruiting joint of Opuntia sfluimaniiii. 3. Flowering joint of Opuntia vulgaris. 



2. Flower of Opuntia schumannii. 4. Flowering joint of Opuntia stricta. 



(All natural size.) 



