324 STRUCTURE AND LIFE HISTORIES 
Fig. 230), and its close relative, the false beech-drops 
(Monotropa Hypopitys, Fig. 231), are examples of flowering 
plants, wholly devoid of chlorophyll, and therefore unable 
to manufacture their food, which is absorbed entirely 
from the humus in which they grow. Other examples 
are Lathraa, and the coral-root (Corallorhiza). 
FIG. 231. False beech drops (Monotropa Hypopitys]. (Photo by Elsie 
M. Kittredge.) 
SYMBIOSIS 
306. Different Kinds of Symbiosis. The absorption of 
nourishment from one plant by another involves, of course, 
the intimate association of the two organisms. Such a 
vital association is called symbiosis (living together), and 
we find organisms living together in all degrees of intimacy 
