BRITTON AND ROSE, VOL. III i 
iM 
. f PLATE xvi 
aton di ‘ = 
o 1. Top of flowering plant of Ferocactus hamatacanthus., ABoen &CO 
2. Flowering plant of Sc/erocactus whipplet. 
3. Top of flowering plant of Ferocactus latispinus. 
(All natural size.) 
