172 LEAVES 



Protective Devices of Plants 



I. Against transpiration and temperature changes. 

 By rolling of leaves corn. 

 By folding and rolling in bud all plants. 

 By hairs mullein. 

 By gums, waxes, or resins cabbage. 

 By position of stomata under most leaves. 

 By protection of stomata rubber plant. 

 By fleshy growths agaves. 

 By " sleep " movements legumes. 

 By absence of leaves cactus. 

 By shedding leaves deciduous plants. 

 By erect position compass plants. 

 By varying position of leaf rhododendron. 

 By hugging the ground rosette plants. 

 By subterranean growth tubers, bulbs, etc. 



II. Against animals, including man. 

 By hairs or wool mullein. 

 By prickles rose. 

 By spines cactus. 

 By thorns honey locust. 

 By stinging hairs nettle. 

 By bitter secretions tomato. 

 By poisons Jimson weed. 

 By flinty epidermis grasses. 

 By hugging the ground dandelion. 

 By subterranean growth tubers, bulbs, etc. 



Reference Work 



Collect plants mentioned in the foregoing tables and 

 arrange them with reference to function. Draw. 



