BRITTON AND ROSE, VOL. Ill 



PLATE XX 



M. E. Eaton del. 



1. Top of flowering plant of Malacocarpus tephracanthus. 



2. Flowering plant of M alacocarpus ottonis. 



3. Flowering plant of Echinocactus horizonthalonius . 



4. Fruit of same. 



5. Seed of same. 



(All natural size, except seed.) 



