BRITTON AND ROSE 



M. B, Eaton del. 



1. Joints of Op7C7itia microdasys. 



2. Flowering joint of Opuntia ?>iacrartkra. 



3. Fruit of Opuntia macrarthra. 



4. Seed of same. 



5. Flowering joint of Opuntia opuntia. 

 (All natural size except 4.) 



