56 THE GROWTH AND PARTS OF PLANTS 
&. 
HZ 
SY 
\ 
| 
ie 

is sald to have fleshy roots. 
Kxamples are found in the 
dahlia, orchis, the carrot, 
beet, turnip, etc. In the 
carrot, beet, and turnip the 
root 1s part stem (see page 
d2) and is called also a 
crown tuber. When the 
branches of a root become 
Fig. 8. Bracing roots of maize. swollen, SO as to form oval, 
rounded, or 
flattened ex- 
pansions, the 
root is said . 
to be tubereu- 
lated. Such 
plants as the 
orchis, dahlia, 
etc., have this 
kind of tuber- 
culed root. 
Air roots. 
Most roots 
with which we 
are familiar 
are soil roots, 
since they grow 

-_— 
FIG. 86. Bracing roots of screw pine. 
