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PLATE LXVIII. BLACK JACK OAK. 



1. Flowering branch with immature leaves, (s) staminate blossoms, (p) pistillate blossoms. 



(i) immature acorns, x i. 



2. Branch with mature leaves, immature and mature acorns, x i. 



3. An acorn cup, x i- 



4. An acorn, x 1. 



5. Winter twig with immature acorns, buds, and leaf-scan?, x i. 



6. Section of a winter twig, enlarged. 



