PLATE XI. 
Fig. 1. A typical specimen of a clump forming Cereus (Cereus longispinus?) ; this and 
two other species are common about Langtry, Texas. 
Fig. 2. The star cactus ( Ariophorum fissuratum) which is often abundant at the foot of 
steep, arid, stony slopes from the Pecos river southwestward. 
