FULL-GROWN PLANT AND ITS PARTS 61 
are leaves differing in colour from the common green 
leaf usually found in the flower garden or greenhouse ? 
Plants which grow in the fields and woods occasionally 
have variegated leaves, but they are rare. 
If you should happen to find the toothwort plant, 
or broom rape, you would see that the leaves are white, 
or flesh colour, but never green. They are rather 
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Fria. 92, Stonecrop showing small thick leaves, 
small, more like scales than leaves. Plants which 
have leaves of this kind, without green colour, usually 
grow upon the roots or stems of other plants, and are 
called parasites. 
The green leaf, compared with white ones.! Compare 
the green leaves with the white ones. You see that 
nearly all the green leaves you have gathered, such as 
1The leaves of plants grown in the dark are often white. This 
comparison should be made between leaves grown in the light. 
