PLANT SOCIOLOGY 



Fig. 2. — Polemonium pulcherrimum thriving and flowering under the shelter of deformed 

 Pinus aristata, at 3,500 m., James Peak, Colorado. {Photo by Cooprider.) 



Fig. 3.- 



-Shrub duiK'ti of ri-^lacui Ii ntiscus in the [.lains near Kasljah Fokohiue, iNIorocco, 

 with Callitris articidata. {Photo by Daguin.) 



