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SHIMEK: QUERCUS LYRATA IN Iowa 
Explanation of plates 16 and 17 
PLATE 16 
Quercus lyrata ieee a leafless tree. 
ups and acorns, x .55. 
Young leaves aid ef a twig, < 42; 
PLATE 37 
Mature leaves of Quercus lyrata, x .24. 
Old leaves, taken a year earlier, x .30. 
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