374 
PECULIARITIES OF PLANT LIFE 
The study of plants which deals with their distribution 
and the factors which govern it is called plant ecology 
(e-kol'o-jy: Greek, ozkos, home; logos, talk). 
Figure 347 . — Mistletoe. 
A semi-parasite. This tree has no leaves. 
314. Plant Succession. — When a swamp is drained, a 
forest cleared, or a desert irrigated, plant conditions are 
changed. Thus it becomes impossible for some plants to 
